CD00494 Rev A1_Final

Instruction Manual

For Range ofAir Circuit Breakers

Switchgear Factory at Powai, Mumbai

The L&T switchgear Advantage

• Suitable for tropical climate

• Stands up the Indian summer

• Withstands wide voltage fluctuations

• Accommodates Aluminum terminations

• Easy to maintain

• Easy spares availability through a wide

network of authorised stockists

Switchgear Testing Laboratory (STL) at

Powai Works:

STL is NABL accredited laboratory, fully equipped for all the type tests and routine tests.

STL has dedicated 85 kA short- circuit testing laboratory to ensure that the air circuit breakers meet the high design standards of quality and reliability.

Switchgear Testing Laboratories at Powai, Mumbai.

Larsen and Toubro is India’s largest

manufacturer of low tension switchgear,

offering the widest range of products

from push buttons to circuit breakers.

L&T invests continually in upgrading

its design, manufacturing and testing

facilities to ensure that the products

offer every feature and every advantage

that state-of-the-art technology can offer.

A proven performance record in tropical

conditions has established that L&T

switchgear is ideal for adverse conditions.

INTRODUCTION

L&T’s range of Air Circuit Breakers are manufactured and tested at one

of India’s most modern switchgear factories. Proper installation and maintenance

according to the instructions given in this manual will ensure that the breakers

render long years of trouble-free service.

These breakers are designed for normal industrial environment. It is important that

the circuit breakers subjected to hostile environment e.g. dust, caustic vapour,

corrosive gases etc. are appropriately enclosed.

CONTENTS

Storage.............................................................................................................

Unpacking........................................................................................................

Handling...........................................................................................................

Identification.....................................................................................................

Operation.......................................................................................................

Racking............................................................................................................

Installation........................................................................................................

Protection.........................................................................................................

Accessories......................................................................................................

Maintenance....................................................................................................

Spare Parts......................................................................................................

Overall dimensions..........................................................................................

Wiring diagrams..............................................................................................

Special applications........................................................................................ 14

13

12

11

10

8

7

6

5

4

3

1

2

9

1-1

2-1

3-1

4-1

5-1

6-1

7-1

8-1

9-1

10-1

11-1

12-1

13-1

14-1

1. STORAGE

1-1

PTRI

O FF

Do not store the breaker

uncovered even for a short

period. Always keep it covered

with polyethylene bag.

1. If the ACB is not going to be

used for a long time then place

the carton back on it.

2.

3. Store the breaker in a cool and

well-ventilated place protected

from dusty, corrosive, salt laden

or wet atmosphere.

Only same frame breakers should

be stacked one above another.

5.

4. Please do not drop or roll the

ACB carton while storing or

transporting. Use proper

material handling equipment for

stacking of breakers.

Do not stack more than four

breakers one above another.

6.

2. UNPACKING

FOR DRAWOUT ACBs (up to 3200A & except 4 pole version of 2000A / 2500A / 3200A)

Follow the first 2 steps of fixed ACB unpacking.

2-1

FOR FIXED ACBs

Lift the carton/wooden case. Cut and

remove any accessories taped to

breaker or kept loose on the pallet.

Open the polyethylene bag.

2.

1. Cut the straps and remove the nails.

3. Remove breaker mounting hardware, arc-chute holding bracket,

Remove the locking plate & Rack out the breaker.

1.

Pull the breaker out. Remove breaker

mounting hardware & lift the breaker.2.

5. Remove cradle clamping hardware. Lift the cradle.

FOR DRAWOUT ACBS (4 pole version of 2000A / 2500A / 3200A & above)

There are separate packing cases for packing of breaker & cradle.

1. For breaker unpacking follow procedure mentioned for fixed ACB unpacking.

2. For cradle unpacking, follow 1 & 5 steps mentioned in drawout ACB unpacking.

3.

(Arc chute holding bracket

Remove arc-chute holding bracket,

padding fixed to the breaker over arc-chute.

4.

Case packing Carton packing Nails Nails

padding fixed to the breaker over arc chutes & lift the breaker.

(Arc chute holding bracket and padding)

*: For 3P/4P 3200D/4000C breaker, arc chute should be unpacked and mounted on the breaker.

*

and padding)

*

(If any)

3. HANDLING

3-1

Move the packing with fork lift. Do

not drop or roll the packing case.

1.

Caution:

1. Before handling remove breaker from cradle (for drawout ACBS).

2. Do not lift / handle the breaker or cradle by holding its front facia / operating handle / breaker

3. Keep the breaker on a flat, firm surface in its normal position. Do not

keep it on sides or in up side down position.

Note : Refer the table as per clause 3.1 for weights of different

ratings of breaker.

2. Pictures showing attachment of ropes to breaker & cradle for handling.

or cradle terminal / jaw contacts.

3-2

3.1 Weight of manually operated breaker (kg):

For electrical breaker add 7 kg to the above mentioned breaker weight.

CN-CS...CRating

800/1000C

1250/1600C

2000/2500C

5000/6300C

38

38

50

105

54

55

77

207

44

44

65

137

Breaker 3P Breaker 4PCradle 3P Cradle 4P

50

51

72

153

51

51

72

76

76

CN-CS...HRating

800/1000H

1250/1600H

2000/2500H

3200H0/3200H1

4000H0/4000H


38

38

50

53

53

55

55

77

86

86

44

44

65

57

57

Special orders

Rating

3200D

4000C

3200C


113

115

73

75

75

50 86

154

156

57

101

101

CN-CS...S1Rating

630/800/1000/1250S1

1600S1

2000S1

2500S1

3200S1


50

51

62

72

73

38

38

38

50

50

54

55

71

85

86

44

44

44

57

57

CN-CS...GRating

400/630/800/1000/1250/1600G

2000G

Breaker 3P

50

51

4. IDENTIFICATION

I : ......... A nU : .........V ~ 50/60 HzeI : .........kA I : .....kA cu csI : .........kA for 1 seccwUtilization Category : B

1

2

3

4

5

IS 13947-2

IEC 60947-2

BS EN 60947-2

8

9

10

CN-CS 2000C

METAL LABEL OF

4-1

Rated current

Rated operational voltage

Rated ultimate short-circuit breaking capacity

Rated short time withstand capacity

Utilization category

Range of rated frequency6

5

4

3

2

1

6

7

APPLICABLESTANDARDS

ACB RATINGTYPE DESIGNATION

RATED CURRENT

RATED OPERATIONALVOLTAGE

RATED ULTIMATE SHORT-CIRCUIT BREAKING CAPACITY

RATED SHORT TIMECURRENT WITHSTAND

CAPACITY

SUITABILITY FOR ISOLATION

UTILIZATION CATEGORY

SERIAL NUMBER

RATED SERVICE SHORT-CIRCUIT BREAKING CAPACITY

CN-CS 2000CFR167177In

: 415 V ~ 50/60 Hz

I : 55 kA I : 55 kAcu csI : 55 kA for 1 seccwUtlization Category : B

Standard : IS 13947-2 IEC 60947-2

: 2000 A Sr. No.

Ue

X

11

13

12

12

13

11

10

9

8

7 Rated service short-circuit breaking capacity

Standard compliance

Standard compliance

Standard compliance

Suitability for isolation

Type designation

marking

LARSEN & TOUBRO LIMITED

C-POWER

MAIN FACIA LABEL

4.1 Identification for S1/C/D/H range breakers:

4-2

Rated current

Rated operational voltage

Rated ultimate short-circuit breaking capacity

Rated short time withstand capacity


Range of rated frequency6

5

4

3

2

1

12

13

11

10

9

8 Standard compliance

Standard compliance

Standard compliance


Type designation

marking

MAIN FACIA LABEL

CIRCUIT BREAKING CAPACITY

TYPE OF APPLICATION

CN-CS 1600G In

: 415V ~ 50/60 Hz

I : 50 kA I : 100% I cu csI : 50 kA for 1 scwUtilization Category : B

Standard : IS/IEC 60947-2, IEC 60947-2

: 1600A Sr. No.

Ue

cu

FOR DG SET

FR167177

METAL LABEL OF

APPLICABLESTANDARDS

ACB RATINGTYPE DESIGNATION

RATED CURRENT

RATED OPERATIONALVOLTAGE

RATED ULTIMATE SHORT-

RATED SHORT TIMECURRENT WITHSTAND

CAPACITY

SUITABILITY FOR ISOLATION

UTILIZATION CATEGORY

SERIAL NUMBER

RATED SERVICE SHORT-CIRCUIT BREAKING CAPACITY

C-POWER G-RANGE BREAKER

I : 1600 A nU : 415 V ~ 50/60 HzeI : .50 kA I : 100 % I cu cuI : 50 kA for 1 scwUtilization Category : B

IS/IEC 60947-2

IEC 60947-2BS EN 60947-2

CN-CS 1600 G cs

FOR DG SET

1

2

3

4

5

8

9

10

6

7

11

13

12

14

14 Type of Application

4.2 Identification for G-range breakers:

7 Rated service short-circuit breaking capacity

4-44-3

** Should not be removed while removing ACB from packing case. * Overcurrent releases type DN1/ SR18/ SR18G / SR71 etc.,when provided is mounted at the same location.

Rating label

2 Top cover

3 Arc chutes

4 Lifting lug **

5 Operating handle

6 ‘ON / OFF’ indication

7 Spring ‘Charged / Discharged’ indication

8 Mounting bracket

10 Overcurrent release type DN1

1

11

12 Sealable sliding shutters for push buttons

13 ‘Trip’ push button

‘Close’ push button

Fig. 4-1 FIXED ELECTRICAL ACB

123

4

5

6

7

8

9

10

12

11

4-44-4

** Should not be removed while removing ACB from packing case. * Overcurrent releases type DN1/ SR18/ SR18G / SR71 etc.,when provided is mounted at the same location.

Rating label

2 Top cover

3 Arc chutes

4 Lifting lug **

5 Breaker (Draw-out part)

6 Cradle (Fixed part)

7 ‘ON / OFF’ indication

8 Spring ‘Charged / Discharged’ indication

9 Operating handle

10 Door interlock

1 11

12 Position indication

13 Lock in - ‘Isolated’ position / ‘Any’ position

14 Racking handle

15 Bezel (to be mounted on panel door)

16 Overcurrent release type SR21i *

17 Sealable sliding shutters for push buttons

18 ‘Close’ push button

19 ‘Trip’ push button

Racking interlock

11 12 14

123

4

5

6

7

8

9

10

13

15

16

17

19

18

Fig. 4-2 DRAWOUT ELECTRICAL ACB

Current transformer(for protection)

Scraping earth (moving)

Moving isolating contacts (SIC)

Secondary

Contact jaws

Safety shutter

Microswitch for positionindication

Racking screw

Door interlock

Racking interlock

Fixed isolating contacts (SIC)

Secondary

Earthing terminal at rear

Scrapping earth (fixed)

Telescopic rail

Interlock support

Cradle facia

4-5

Door interlock pin

Lock in isolated / any position

Voltmetric release termination

Cradle terminal

Arc chute clamps

Fig. 4-3 DRAWOUT ACB - REAR VIEW

Fig. 4-4 CRADLE - FRONT VIEW

Note : Please do not place the breaker on its rear side.

Racking handle

Mounting bracket

4-6

* Please consult us for application at dc voltages & higher operational voltage upto ** Icw values are indicated based on thermal considerations. While selecting a breaker please ensure that Icw requirement for the application is not more than Ics / Icu at the point of installation.

690V AC.

Technical Data Sheet

E

3

50

-

50

-

50

50

-

105

-

S1

50

-

50

-

50

50

-

105

-

C

3/4

50

35

50

35

50

50

35

105

73.5

H

65

50

65

50

65

65

50

143

105

1000

1000

415

1000

394

326

414

431

Rating (A)

Type Designation

Rated current (A) at 50°C

Rated operational voltage (V), 50/60Hz

Rated insulation voltage (V), 50/60Hz

No. of poles

380/415/500V

690V

380/415/500V

690V

0.5 sec

1 sec

3 sec

380/415/500V

690V

Fixed

Draw out

400

E

400

415

1000

3

50

-

50

-

50

50

-

105

-

E

3

50

-

50

-

50

50

-

105

-

S1

3/4

50

-

50

-

50

50

-

105

-

S1

50

-

50

-

50

50

-

105

-

E

3

50

-

50

-

50

50

-

105

-

In

*Ue

Ui

Icu

Ics

**Icw

Icm

630

630

415

1000

800

800

415

1000

C

3/4

50

35

50

35

50

50

35

105

73.5

H

65

50

65

50

65

65

50

143

105

394

326

414

431

3 Pole

4 Pole

3 Pole

4 Pole

H

W

D

H

W

D

44 4

40

60

B

?

40

60

B

?

40

60

B

?

Rated impulse withstand voltage

of main circuit (kV)

Rated making capacity50/60Hz (kA peak)

40

60

B

x

x

15000

6000

385

316

-

423.5

-

-

-

-

?

?

?

?

?

x

x

15000

6000

385

316

-

423.5

-

-

-

-

?

?

?

?

8000

?

?

x

x

15000

6000

385

316

-

423.5

-

-

-

-

?

?

?

?

8000

?

?

?

?

20000

8000

468

399

487

587


of aux. circuit (kV)Uimp 4

?

?

?

?

8000

?

x

?

x

15000

6000

385

316

-

423.5

-

-

-

-

?

?

?

?

8000

?

?

?

?

20000

8000

468

399

487

587

Uimp

?

?

?

?

8000

Typical opening time (ms)

Typical closing time (ms)



Fixed

Draw out

Manual

Electrical

‡Electrical & Mechanical life (operating cycles)

Electrical life without maintenance

Dimensions (in mm)

8 8 8 812 12 12

20000

Rated short time

withstand capacity

50/60Hz (kA rms)

Rated service short circuit breaking

capacity 50/60Hz (kA rms)

Rated ultimate short circuit breaking


394

326

414

431

468

399

487

587

‡ Electrical life = Mechanical life. However, arcing contacts need to be replaced depending upon wear & tear.

4-7

S1

50

-

50

-

50

50

-

105

-

C

3/4

50

35

50

35

50

50

35

105

73.5

H

65

50

65

50

65

65

50

143

105

E

3

50

-

50

-

50

50

-

105

-

S1

50

-

50

-

50

50

-

105

-

C

3/4

50

35

50

35

50

50

35

105

73.5

H

65

50

65

50

65

65

50

143

105

E

3

50

-

50

-

50

50

-

105

-

C

3/4

55

40

55

40

55

55

50

121

84

20000

394

482

628

431

468

555

701

587

S1

50

-

50

-

50

50

-

105

-

2000

2000

415

1000

1250

1250

415

1000

394

326

414

431

20000

394

326

414

431

20000

H

75

65

75

65

75

75

65

165

143

1600

1600

415

1000

4 4 4

40

60

B

?

40

60

B

?

40

60

B

?

?

?

?

?

7000

?

?

?

?

7000

468

399

487

587

?

?

?

?

7000

?

x

?

x

6000

385

316

-

423.5

-

-

-

-

?

?

?

?

7000

?

?

?

?

7000

?

?

?

?

7000

?

x

?

x

4500

385

316

-

423.5

-

-

-

-

x

?

?

?

5000

-

-

-

-

468

399

487

587

?

?

?

?

5000

?

?

?

?

5000

8 812 12 12


Rating (A)

Type Designation




No. of poles

380/415/500V

690V

380/415/500V

690V

0.5 sec

1 sec

3 sec

380/415/500V

690V

Fixed

Draw out

In

*Ue

Ui

Icu

Ics

**Icw

Icm

3 Pole

4 Pole

3 Pole

4 Pole

H

W

D

H

W

D





of aux. circuit (kV)Uimp

Uimp





Fixed

Draw out

Manual

Electrical



Dimensions (in mm)

Rated short time

withstand capacity

50/60Hz (kA rms)





468

399

487

587

* Please consult us for application at dc voltages & higher operational voltage upto ** Icw values are indicated based on thermal considerations. While selecting a breaker please ensure that Icw requirement for the application is not more than Ics / Icu at the point of installation.

690V AC.

‡ Electrical life = Mechanical life. However, arcing contacts need to be replaced depending upon wear & tear.

E

50

-

50

-

50

50

-

105

-

?

?

6000

-

-

-

385

316

423.5

3

8

x

x

4-8

2500

C

2500

415

1000

3/4

60

40

60

40

60

60

55

132

84

S1

60

-

60

-

60

60

-

132

-

H

75

65

75

65

75

75

65

165

143

3200

H0

3200

415

1000

3/4

75

65

75

65

75

75

70

165

143

S1

60

-

60

-

60

60

-

132

-

H1

100

85

100

85

100

100

85

220

187

H0

75

65

75

65

75

75

70

165

143

H

100

85

100

85

100

100

85

220

187

C

70

?

70

?

70

70

?

154

?

4000

415

1000

3/4

394

482

628

431

?

?

?

?

468

701

909

587

10000

?

?

?

?

468

701

909

587

4

12

40

60

B

?

40

60

B

?

40

60

B

?

x

?

?

?

5000

-

-

-

-

?

?

?

?

20000

5000

468

555

701

587

?

?

?

?

5000

x

?

?

?

5000

-

-

-

-

468

555

701

587

x

?

?

?

x

?

?

?

5000

x

?

?

?

5000

x

?

?

?

5000 2500

-

-

-

-

583

711

913

691

x

?

?

?

4

12

4

12

10000

5000

5000


Rating (A)

Type Designation




No. of poles

380/415/500V

690V

380/415/500V

690V

0.5 sec

1 sec

3 sec

380/415/500V

690V

Fixed

Draw out

In

*Ue

Ui

Icu

Ics

**Icw

Icm

3 Pole

4 Pole

3 Pole

4 Pole

H

W

D

H

W

D






Uimp





Fixed

Draw out

Manual

Electrical



Dimensions (in mm)

Rated short time

withstand capacity

50/60Hz (kA rms)





* Please consult us for application at dc voltages & higher operational voltage upto 690V AC.** Icw values are indicated based on thermal considerations. While selecting a breaker please ensure that Icw requirement for the application is not more than Ics / Icu at the point of installation.‡ Electrical life = Mechanical life. However, arcing contacts need to be replaced depending upon wear & tear.

Please consult us.

6300

C

6300

415

1000

3/4

95

?

95

?

95

95

?

209

?

x

?

?

?

2500

-

-

-

-

583

913

1182

691

12

4

40

60

B

?

5000

5000

C

5000

415

1000

3/4

95

?

95

?

95

95

?

209

?

2500

-

-

-

-

583

913

1182

691

x

?

?

?

?

40

60

B

12

4

5000

4000

?

4-9

G

50


Rating (A)

Type Designation




No. of poles

415V

415V

1 sec

415V

Fixed

In

*Ue

Ui

Icu

Ics

**Icw

Icm

3 Pole

H

W

D






Uimp





Fixed



Dimensions (in mm)

Rated short time

withstand capacity

50/60Hz (kA rms)





** Icw values are indicated based on thermal considerations. While selecting a breaker please ensure that Icw requirement for the application is not more than Ics / Icu at the point of installation.‡ Electrical life = Mechanical life. However, arcing contacts need to be replaced depending upon wear & tear.

400 630 800 1000 1250 1600 2000

400 630 800 1000 1250 1600 2000

3 3 3 3 3 3 3

10001000 1000 1000 1000 1000 1000

50 5050 50 50 50

50 50 5050 50 50 50

50 50 5050 50 50 50

105 105 105105 105 105 105

12 12 1212 12 12 12

4 4 44 4 4 4

40 40 4040 40 40 40

60 60 6060 60 60 60

B B BB B B B

???????

???????

Manual ???????

20000 20000 20000 20000 20000 20000 20000

80008000 8000 8000 7000 6000 4500

394

326

431

394

326

431

394

326

431

394

326

431

394

326

431

394

326

431

394

326

431

G G G G G G

415 415 415 415 415 415 415

4-10

Breaking capacities:

CN-CS : S1

CN-CS : E

50kA 50kA 50kA

50kA 50kA

50kA 50kA

630A400A

CN-CS : C

CN-CS : H

CN-CS : H0

CN-CS : H/H1

Frame-1

50kA 50kA 50kA 50kA

65kA 65kA 65kA 65kA

800A 1000A 1250A 1600A

Icu = Ics = Icw

Frame-1 Frame-2

50kA

50kA 50kA 50kA 50kA

60kA 60kA

Frame-3Frame-2

55kA 60kA

75kA 75kA

75kA

100kA

2000A 2500A 3200A

75kA

100kA

95kA 95kA

4000A 5000A 6300A

Frame-4

Rated Current

50kA

Frame-1

Range

CN-CS : G 50kA 50kA50kA 50kA 50kA 50kA 50kA

Frame-1

4-11

CAUTION

SPRING UNDER TENSION.PERSONAL INJURY

MAY BE CAUSED

ELECTRICAL HAZARD

BEWARE OFELECTRICAL SHOCK,

PERSONAL INJURY ORSCALDING BURNMAY BE CAUSED

WEAR PERSONAL PROTECTIVE EQUIPMENT

WHILE CONNECTINGOR DISCONNECTING

CAUTION

OPERATION

5-1

TRIP / RESET Push Button

ON - OFF Indicator

PT

RI

- R

ES

TE

Close

Front View Side View

2

1

53

4

Fig. 5-1

OFF

Fig. 5-2

NO

Fig. 5-3

(Except 5000/6300-4P version)Speed of closing is independent of the speed of handle movement.

Initially breaker is OFF.

1. For carrying out any operation, thebreaker-operating handle has to bepulled out fully by holding its top portion.

2. For extra leverage, the handle can be telescoped lengthwise (recommended).

RESETTING:0

3. Rotate the operating handle by 90 in anti-clockwise direction (till it becomes horizontal). The breaker will trip at the beginning of the resetting operation, if it is in closed condition.

CLOSING :

0

4. Rotate the operating handle by 90 in clockwise direction (till it becomesvertical to close the ACB).

5. After completing the operation ensure that the handle is placed back in the cavity on the front facia.

The sequence of operation is RESET ? CLOSE ? OPENCaution :Resetting the ACB in ‘ON’ condition will cause the ACB to trip.

Precaution :Ensure presence of supply voltage to undervoltage release (if fitted) before closing the ACB.

In case of manual reset type ACB actuation of TRIP push button / key of lockable trip push button, resets the tripping mechanism of ACB.

5. OPERATION

5.1.1 OPERATION FOR G/S1/C/H/D - RANGE BREAKER

5.1 MANUALLY OPERATED BREAKERS:

Operating sequence of manual breakers:-

Operating Handle (refer Fig. 5-2) can occupy either of the two

distinct position spaced 90 apart.- Horizontal Position : ‘OPEN- RESET’

- Vertical Position : ‘CLOSED’ or ’TRIPPED’

An indicator provided on front facia (refer Fig. 5-1) shows the - RED / ON : ‘CLOSED’ - GREEN / OFF : ‘OPEN’

position of the main contacts.

0

ACB closes in single stroke operation of the handle.

5-2

OFF

Fig. 5-4

Fig. 5-5

Fig. 5-6

OPENING THE CIRCUIT BREAKER :

The breaker can be opened by the following

means :

LOCALLY (Manually) :

1. Press the TRIP push button.

OR

2. Press key of lockable trip push button

(when provided).

3. Rotate key of racking interlock for draw

out breakers (if provided) when the

breaker is in any position between

‘Service’ and ‘Test’.

4. Operate handle anti-clockwise.

REMOTELY (Electrically) :

1. Through shunt release.

2. Through under voltage release.

(Refer section 9: Accessories)

Indicate with key

OFF

T PRI

ON

Note: For operation of 5000/6300-4P version of manual ACB refer manual charging (clause 5.2 in page 5-4) and for closing & opening the circuit breaker (page no. 5-5).

OPERATION

5-3

Operating sequence of manual breakers:-

TRIP / RESET Push Button

ON - OFF Indicator

PT

RI

- R

ES

TE

Close

Front View

3

4

Fig. 5-7

Speed of closing is independent of the speed of handle movement.

Initially breaker is OFF.

RESETTING :

0

CLOSING :

The sequence of operation is RESET ? CLOSE ? OPEN

Caution :

5.1.2 OPERATION FOR E - RANGE BREAKER

Operating Handle (refer Fig. 5-7) can occupy either of the two distinct position spaced 90 apart. - Horizontal Position : ‘OPEN - RESET’ - Vertical Position : ‘CLOSED’ or ’TRIPPED’

An indicator provided on control box (refer Fig. 5-7) shows the position of the main contacts. - RED / ON : ‘CLOSED’ - GREEN / OFF : ‘OPEN’

Rotate the operating handle by 90 in anti-clockwise direction (till it becomes horizontal).

The breaker will trip at the beginning of the resetting operation, if it is in closed condition.

0

Rotate the operating handle by 90 in clockwise direction (till it becomes vertical to close the ACB).

Presence of supply voltage is essential to close a breaker fitted with under voltage release.

0

The breaker can be tripped by the following means: Local : a) By pressing the red ‘TRIP’ button (refer Fig. 5-7) b) Key of lockable trip push button (when provided) Remote : Through Voltmetric release (refer Section 9 )The tripping push button also serves to reset the over-current and short circuit release if the breaker is fitted with local resetting feature. Resetting of the manual breaker by handle will not reset O/L-S/Crelease in such case.

: Accessories

OPENING :

Resetting the ACB in ‘ON’ condition will cause the ACB to trip.

ACB closes in single stroke operation of the handle.

5-4

ON

‘TRIP / RESET’ Push Button

‘CLOSING’ Push Button

Front View

Side ViewON - OFF Indicator

Spring Charged / Discharged Indicator

Charging Handle

052

Fig. 5-8

Fig. 5-9

5.2 ELECTRICALLY OPERATED CIRCUIT BREAKER :

Initially breaker is OFF and spring is

discharged.

Spring condition is indicated by a

mechanical indicator visible through a

transparent window on the front facia.

Indicator display Spring condition

YELLOW

BLACK

CHARGED

DISCHARGED

The spring in the circuit breaker operating

mechanism must be charged to store the

energy required to close the main contacts.

The spring may be charged manually using

the charging handle or automatically by the

motor.

Electrical Charging :

The spring is automatically charged &

automatically recharged after each closing

operation. (Provided there is a continuous

supply to the motor)

Manual Charging :

In case of power failure, charge the main

spring through multiple strokes of charging

handle. The handle has to pulled outward by

gripping its top portion.

0

Charge by giving small strokes (25 ) as shown in Fig. 5-8 in the clockwise direction till indicator display

shows a spring charged condition (yellow colour).

Now the breaker is OFF and spring is charged.

OPERATION FOR C/S1/H/D - RANGE BREAKER

5-5

ON

CLOSING THE CIRCUIT BREAKER :

(Ensure precautions before closing same as

manual ACBs.)

Breaker is OFF and spring is charged.

LOCALLY (Manually):

Press ON push button.

REMOTELY (Electrically):

The closing electromagnet, when actuated,

discharges the spring and closes the

breaker.

OPENING :

The methods of opening are the same as those for manually operated breakers (except method ‘4’ of

local opening).

5.3 OPERATIONAL FEATURES

5.3.1 ANTI-PUMPING :

After a close - open cycle, it is not possible to reclose the breaker (for electrically operated breakers) if

the closing command is maintained. This feature known as anti-pumping, is assured mechanically,

both in local and remote control operation. This feature prevents auto reclosure of breaker on fault. For

reclosing the breaker, the permanent closing command should be momentarily interrupted. For Electrical

5.3.2 TRIP FREE MECHANICAL SWITCHING :

(Both for manually and electrically operated breakers)

The moving contacts of the breaker return and remain in open position, when the opening operation is

initiated after initiation of closing command. In this case the closing command is overruled by the

tripping command.

Fig. 5-10

anti-pumping refer page no.8-19.

6. RACKING

SERVICE

Panel door

TEST

Panel door

ISOLATED

ON

6-1

OFF

OFF

Panel door

Fig. 6-1

Fig. 6-2

Fig. 6-3

Circuit breaker positions

The indicator on the front, shows the position of the circuit breaker in the cradle.

Service position : In service position both power and control circuits are connected.

Isolated position : In isolated position both power and control circuits are disconnected from

supply to ensure complete isolation.

Test position : In test position power circuit is open ensuring full safety, while control circuit is

connected for checking accessories as well as breaker operation.

Panel door facia have to be aligned

6-2

Racking OUT / IN

1

2

SERVICE

Fig. 6-4 (i)

Rack out

Rack in

3

5

4

SERVICE

Fig. 6-4 (ii)

Fig. 6-4 (iii)

PROCEDURE :

1. Racking operation must be done with the

aid of racking handle, provided in racking

handle storage location.

2. Insert the racking handle in the racking

slot.

3. Rotate the racking handle in clockwise

direction to rack in and in anti clockwise

direction to rack out.

4.

emove the racking handle from the

racking slot.

5. After completion of racking operation

ensure that the racking handle is kept in

its correct storage location.

Note :

I. If the panel door is open, keep the door

interlock pin pressed during racking.

II. If racking interlock is provided press the

key inwards and turn it clockwise before

racking.

Ensure the breaker is in SERVICE position

and r

Caution :

Open the circuit breaker before racking

IN / OUT.

Note: If the breaker is inserted or withdrawn with it’s main contacts in closed position, then a deviceautomatically trips the breaker before separation of the main isolating contacts(during withdrawal)or before they come into contact (during insertion). The same device prevents the closing of thebreaker at one particular location between the position ’Test’ and ‘Service’.

When racking interlock provided, the key of the lock has to be pressed and turned anti-clockwise (thiswill trips the breaker if it is in closed condition at any location between the positions ‘Test’ and ‘Service’)before initiation of the racking operation, otherwise it will not be possible to rack the breaker in or out.If the cradle is provided with door interlock, ensure that either the door is closed or interlock is defeatedwhile attempting racking.

7. INSTALLATION

7-1

Fig. 7-1 FIXED ACB - METHOD OF MOUNTING

7.1 INSTALLATION AMBIENT

Install the ACB in dry, dust free, non-corrosive ambience without subjecting it to abnormal shocks /

vibrations. If the above is not possible, provide adequate degree of protection.

Refer to Section 12 for the following information.

- Overall dimensions

- Mounting details

- Panel door cut-out and bezel fixing

- Terminal connections

- Fixing of door interlock components on the panel door (provided in a polyethylene bag)

For fixing the door interlock components on the cradle (provided in another polyethylene bag) Please refer to

Section 9.

7.2 INSTALLING A FIXED BREAKER

7.2.1 MOUNTING

• Mount the breaker on the side brackets with the aid of 4 bolts of M8 or M10 (Refer to item No. in

Fig. 7-1). For further details refer the section 12.

1

• Insert spacers, if necessary, to prevent deformation during tightening.

• To facilitate normal maintenance, following clearances are required to be maintained

- 140 mm above the breaker to replace arc chutes.

- 200 mm above the breaker to replace arcing contacts.

- 200 mm below the breaker to replace voltmetric releases.

- 50 mm on either side of the breaker (150 mm on left side in case of breaker with mechanical

interlock).

Clearance distance - a safety requirement :

- It is essential to maintain a minimum clearance of 100 mm above the breaker for permitting

expansion/dispersion of the gases emanating from the arc chutes.

- The metallic components, if exist, should be placed at a minimum distance of 200 mm above the

arc chutes.

- If there are metallic components between 100 mm and 200 mm, then an insulating screen should

be placed at a distance of 100 mm minimum above the arc chutes.

Panel Structure

Metallic components (if exist)

20

0m

in

10

0

First fixed Support

Insulating Screen

100min

min

20

0m

in

1

NOTE: Dimensions are in mm

Metallic components (if exist)

20

0m

in

10

0

First fixed Support

Insulating Screen

100min

min

20

0m

in

E-Range breakerG/S1/C/H/D-Range breaker

7-2

Bolt sizeTorque (kgf-m)

High-tensile

M8

M10

M12

Standard

0.85

1.88

3.2

2.5

4.7

7.8

Bolt dia (mm)

8

10

12

7.2.2 CONNECTIONS

7.2.2.1 MAIN CIRCUIT

•

• Use links as per the recommendations given in IS/IEC: 60947 (Part 1).

• Support these links to guard against electrodynamic forces during short circuit.

• Ensure that the first set of fixed supports (fixing the conductor rigidly through an insulating support to

panel structure) is fixed at a distance 100 mm (as shown in fig. 7-1) so that stresses induced during

short circuit do not exceed elastic limit of the link material.

• Ensure that the links are terminated with right size of bolts, tightened to appropriate torque by using

proper plain and spring washers.

Refer clause 12.4 for additional information on good termination practices.

Clean the terminals and links by using cheese cloth. Do not damage plating.

7.2.2.2

• Rated for 16A at 500 V.

7.2.2.3

7.2.3

AUXILIARY CIRCUIT

• Auxiliary terminals for control circuit connections are located on the rear top cross-piece of the

Breaker.

• Max. 24 nos.

2• Accommodates flexible cable upto 2.5 mm .2• Unless otherwise specified by the customer, connections are to be made with PVC insulated 1.5 mm

copper wire conforming to IS: 694.

• Refer to Sec. 13 for internal wiring.

• The fuse ratings to be provided for the protection of accessories (voltmetric releases, charging motor

and the closing electromagnet) must be based on their power consumption (indicated in Sec. 9 -

Accessories).

EARTHING

• The earthing location is in the rear bottom corner of the right side plate of the breaker marked with

symbol. (Please refer drawing in section 12)

• Clean and degrease the unpainted surface of the earthing connection.

• Use M6 screw for connecting earth bar.

ARRANGEMENT OF CUBICLE DOOR

• Provide a cut-out in the cubicle door for breaker front facia projection

• Refer to Sec. 12 for location of the door cut-out with respect to door hinges (right or left) and fixing the

bezel on the door.

7-3

7.3 INSTALLING A DRAWOUT BREAKER

7.3.1 MOUNTING

• Holes are provided on horizontal surface for mounting the cradle

• Insert spacers, if necessary, to prevent deformation of the cradle during tightening. To ensure proper

dust proofing, maintain the distance of 8.9 mm between the inner side of the cubicle door and the

outer surface of the interlock support .

• No extra space is required to be provided in the cubicle for maintenance. The breaker can be

maintained fully by drawing it out to a ‘Maintenance’ position (telescopic rails fully stretched)

• In case of breaker with mechanical interlocking leave minimum of 150 mm space on the left side of

the ACB for clutch cable routing.

• Clearance distance - a safety requirement :

Follow the same instructions as mentioned for ‘Installing a fixed breaker’ (clause 7.2.1)

(for mounting refer the clause 12.2.1

& 12.2.2 in Section 12).

7.3.2

7.3.2.1 MAIN CIRCUIT

• Remove the nut plates fixed to the terminals.

• Use the nut plates for making connection to the terminals.

• Follow the same instructions as mentioned for ‘Installing a fixed breaker’.

7.3.2.2 AUXILIARY CIRCUIT

• Secondary Isolating contacts (SICs) meant for control circuit connections are located on cradle &

breaker (Refer to Sec. 4 - Identification)

• Maximum 24 SICs are available for Electrical D/O and 18 SICs for Manual D/O (standard ACBs). 2• Each SIC terminal can accommodate two lugs suitable for crimping with 1.5 mm flexible cable.

• Rated for 16A at 500 V.

• Unless otherwise specified by the customer, internal connections are made with PVC insulated2 1.5 mm copper wire conforming to IS: 694.

• The SIC terminals on the breaker and the cradle are arranged in a precise order (refer. to wiring

diagrams in Sec. 13) to facilitate interchangeability between breaker of same specification.

• Different electrical connection for ‘Test’ & ‘Service’ position of the breakers are possible by adopting

the procedure mentioned as follows.

CONNECTIONS

7-4

Procedure for having different electrical connections in ‘Test’ and ‘Service’ positions.

• Remove fixed SIC block by removing fixing

screws

• Decrimp the terminal which needs to be

removed

• Break at neck of the terminal

The standard secondary isolating contact block comprising totally 6 sets of terminals, has two ‘through’

terminals. These ‘through’ terminals are necessary for electrical breakers to give electric supply to the

charging motor in (terminals C and D on wiring diagram in Section 13).

Please do not forget to wire the microswitch C6 in position (refer to Section 13) for electrical

breakers.

• The microswitches in ‘Service’, ‘Test’ or ‘Isolated’ position are designed to take wires with snap on

cable lugs.

• Two covers are provided on the cradle at SIC outgoing side. These covers protect the auxiliary

circuit wire from accidental trapping with the moving part while the breaker is being racked in or

racked out.

• The wiring of the position microswitches should pass between

the rear-end of telescopic rail and the cradle terminal mounting

plate of the cradle before joining the bunch of wires leaving the

secondary isolating contact blocks (as shown in fig. 7-2).

The rating of the fuses to be used for the protection of the accessories (voltmetric releases ,charging

motor and the closing electromagnet) should be based on their power consumption (indicated in Section 9

- Accessories).

EARTHING

• The earthing location is on rear bottom right side of the cradle marked with symbol

• Clean and degrease the unpainted surface for the earthing connection.

• Connect earthbar of the switchboard / panel to the M10 earthing screw on the cradle.

‘Test’ and ‘Service’ positions

‘Service’

7.3.2.3

Terminal

Connection

Fig. 7-2

1

2

Point for Adjustment of Overload Current Setting.

Mechanical Trip Actuator.

1

2

Fig. 8-1

8-1

In case of breakers with local reset feature, tripping through release leaves the latch of the mechanism

open & hence resetting with the help of the local ‘TRIP/RESET’ or ‘TRIP/LOCK/RESET’ push button is

necessary prior to subsequent closing operation.

The release is provided with a Strip (refer to item no. 1 in Fig. 8-1) for manual tripping. Pressing the strip

downwards will release the mechanical latch of the release and trip the breaker.

The DN1 release incorporates a definite minimum impulsion time of 25 ms on magnetic trip. Trip time is

independent of the magnitude of short circuit current and is achieved by the aid of a fly wheel. This release

has inverse thermal time-current characteristics on overload.

The magnetic threshold of the release depends on the tap of the current transformer chosen. A label is

pasted on the top of the release to indicate the magnetic threshold of the protection system at various CT

taps.

8.1 THERMOMAGNETIC RELEASE TYPE DN1

8.1.1 FEATURE

Air circuit breakers are available with multi-tap CT fed over current release system type DN1.

The rated secondary current of the CT is 8.75A.

Mechanism of protection is as under :

(I) Three electro-magnets provide protection against short-circuit current. Each electromagnet is

provided with two taps M1 and M2 for selecting operating threshold.

(II)Three bimetallic strips give protection against overloads. These are individually adjustable from

0.75 In to 1.0 In by means of a pointer (2) on the front face of the release (refer to Fig. 8-1).

The release operates through its striker on the main trip latch of the mechanism and is reset by the main

8. PROTECTION

Fig. 8-2

8-2

0.1

1

10

100

1000

10000

0.01

1 2 6 10 20

Multiples of Current

Trip

tim

e in

sec

onds

0.2

0.40.3

0.7 3 4 5 7 8 9 30 40 50 100 400 1000

M1

M2

1.05

1.2OPERATING LIMITS THERMAL

DN 1

25 ms

ZONE OF SHORT CIRCUIT OPERATION (M1/M2)

TOTAL OPERATING TIME

MIN. IMPULSION TIME

8.1.2 TIME-CURRENT CHARACTERISTICES OF DN1 RELEASE

NOTE : Only one CT per pole can be fitted on the breaker. Request you to choose correct CT to be mounted in breaker, in case more than one CTs are available for a particular rating. 8-3

8.1.3 RELEASE SETTING FOR CN-CS E/G/S1/C/H/D ACBs

TYPEDESIGNATION

CT CTTap(A)

Setting of Magneticrelease

(A)

Thermal CurrentSetting

(A)

CN-CS 4000 C/H/H0

CN-CS 630 S1/G/E

CN-CS 800 C/H/S1/G/E




CN-CS 1600D


CN-CS 2500 C/H/S1

CN-CS 3200 H0/H1/S1

CN-CS 3200D

630

500

800

1000

1250

1600

1600

1250

2000

2500

3200

2000

3200

4000

400

500

630

400

500

640

800

800

1000

1000

1200

1250

1600

800

1000

1250

1600

1000

1250

1600

2000

2000

2500

2500

3200

1600

2000

2000

2500

3200

2000

2500

3200

4000

2500

3000

3600

2700

3200

3900

4700

4700

5700

5700

7000

7000

8800

4700

5700

7000

8800

5700

7000

8800

11000

11000

13500

14000

17500

8500

11500

12500

14000

17000

12500

14000

17000

22000

*

3700

4500

*

3900

4900

6000

6000

7200

7200

8900

8900

11500

6000

7200

8900

11500

7200

8900

11500

14000

14000

17000

17500

22000

11500

16000

16500

18000

23000

16500

18000

23000

29000

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

to

300

375

472

300

375

480

600

600

750

750

940

940

1200

600

750

940

1200

750

940

1200

1500

1500

1875

1875

2400

1200

1500

1500

1875

2400

1500

1875

2400

3000

400

500

630

400

500

640

800

800

1000

1000

1250

1250

1600

800

1000

1250

1600

1000

1250

1600

2000

2000

2500

2500

3200

1600

2000

2000

2500

3200

2000

2500

3200

4000

Operating Limits 0.8 to 1.2 of setting 1.05 to 1.2 of setting

* Not recommended.

CN-CS 400 G/E 400320 1800

400 2300

*

*

240 to 300

300 to 400

8-4

8.1.4 TYPES OF PROTECTIONS

Following types of protections can be provided using DN1 release:

• Only overcurrent protection

• Only magnetic protection

• Overcurrent and magnetic protection

8.1.4.1 ONLY OVERCURRENT PROTECTION

When wired as per Fig. 8-3 with points A & C shorted only overcurrent protection (this includes

protection against both over load & short circuit conditions) is provided.

8.1.4.2 PROCEDURE FOR INCORPORATING ONLY MAGNETIC PROTECTION

Connect the current transformer between terminal M1 or M2 and star point S (refer to Fig. 8-4).

The system provides only magnetic protection.

T1 M1 T2 M2 T1 M1 T2 M2 T1 M1 T2 M2 S

R Y B

A

C

CTs

Fig. 8-3

T1 M1 T2 M2 T1 M1 T2 M2 T1 M1 T2 M2 S

R Y B

C

A

Fig. 8-4

1

2

3

4

5

Current Setting BCD switches.

Power ON LED.

ON/OFF Switch for Thermal Memory.(Instantaneous ON/OFF,

Button to test the SR18G release.

Time Delay Setting BCD switches.

6&12 In)

6

7

8

9

Button to clear previous

Connector for External Testing through SRT-2 Kit.

Query button - for indicating the last fault.

LEDS for fault Indication.

fault indication.

In : Nominal current

Ir : Rated current

LTP : Long Time pick-up

GFP: Ground Fault pick-up

LTD : Long Time delay

STD : Short Time delay

GFD : Ground Fault delay

LT : Long Time Trip Indicator

ST : Short Time Trip Indicator

GF : Ground Fault Trip Indicator

The complete list of abbreviations used is given below.

8-5*Available in SR18G release only.

8.2.1 FEATURES

Current Transformer

8.2 MICROPROCESSOR BASED RELEASE TYPE SR18 / SR18G

The release SR18/SR18G is a micro-processor based over-current and earth-fault release designed

specifically for breakers. It has three zones of protection in a single unit. The release monitors

and operates on the secondary currents of the current transformer (CT) mounted on the breaker. The

suitable knobs on the facia enable the release to provide a wide range of protection for various applications.

Ir-0.5 to 1.00 times In

Steps : 0.50, 0.60, 0.65, 0.70,

0.75, 0.80, 0.85, 0.90, 0.95, 1.00

Operating Limit: 1.05 to 1.2 times Ir

2.5 Sec at 6 times IrLong Time

2 to 10 times In

Steps : 2, 3, 4, 5, 6, 7, 8, 9, 10

20 ms to 600 ms.

Steps : 20, 60,100,160, 200,

260, 300, 400, 500, 600 ms.

0.2 to 0.6 times In

Steps: 0.2, 0.3, 0.4, 0.5, 0.6

100 to 400 ms.

Steps : 100, 200, 300, 400 ms & OFF

Tolerance: ± 10% or 20 ms. (whichever is higher)

Ground

Fault*

6 and 12 In

Tolerance: ± 15% of fault current Instantaneous

Short Time

Type of

Protection

SETTING RANGE OF SR18/SR18G

PICK-UP CURRENT TIME DELAY

6 73 4 521 8 9

The release is fed by three single tap current transformers of same

rating as that of the circuit breaker. This current is referred to as

the nominal current (In) throughout this manual. The CT rating on

the secondary side is 750 mA.

Tolerance: ± 10% of current.


8-6

Fig. 8-5

Rotary BCD switches are used to adjust setting. Red knob for pick-up currents and blue knobs for

time delays.

Factory Settings are as follows

LTP =1.0, LTD-2.5s., STP=6, STD=60ms., IP=12, GFP=0.3, GFD=100ms., Thermal Memory = OFF

Short time pick-up, Ground fault pick-up and Ground fault delay have nine, five and five position of settings respectively. BCD switch arrow placed in between two setting is invalid.

Note : Please change release setting as per your system protection requirement to ensure effective protection.

Multiples of Rated Current

Trip

Tim

e in

Se

c

0.1

1

10

100

1000

1 101 1.2 1.5 2 3 4 5 6 7 8 9 10 20

CURRENT MULTIPLE

0.1

1

10

100

1000

OVERLOAD CHARACTERISTICS SR 18 / 18G

TR

IP T

IME

1. Long Time protection zone

2. Short Time protection zone

3. Instantaneous protection zone

4. Ground Fault protection zone

5. Asymptote for Long Time

protection

8.2.2 CHARACTERISTIC CURVE

A Typical four zone time-current curve provided by the release is shown in Fig. 8-6

8-7

Fig. 8-6

5

1

2

3

4

Current

Trip time

0.01

0.1

1

0.1 1 10 100

TRIP TIME (s)

CURRENT MULTIPLES

GROUND FAULT CHARACTERISTICS SR 18 / 18 G

CURRENT MULTIPLE

RIP

TI

ET

M

0.01

0.1

1

1 10 100100

SHORT CIRCUIT CHARACTERISTICS SR 18 / 18G

10 20

CURRENT MULTIPLE

4 5 6 7 8 92 310.01

0.02

0.06

0.1

0.16

0.2

0.26

0.3

0.4

0.5

0.6

TR

P

IME

IT

Three LEDs are used for displaying the type of fault under which the breaker trips. No external

power supply is required for these indicators. The LED corresponding to the fault shows 'red' when

“Query” button is pressed showing the type of fault, which has caused the tripping of the breaker.

This lasts for 72 hrs. max and remains so till it is cleared by 'clear' pushbutton.

8.2.5 TRIP INDICATORS

8-8

8.2.6

The test button is used to verify the validation of

the software internally, checking whether the

controller is healthy or not. When it is pressed the

Power-On LED changes from blinking green (ON

state) to steady red. However, during the time when

the Test button is pressed all the protections are still

alive and none are affected/defeated.

TEST BUTTON

Sw1

Sw3

Sw5

Sw4

Sw6

Overload

ShortCircuit

G.F

Test Clear Query

POWER Sw9

Inst.

Sw2

8.2.3 CHANGING OF SETTINGS

The settings can be done by changing the knob positions using a suitable screwdriver. Red knobs are used

for setting the pick-up currents, whereas blue knobs are meant for time-delay setting. Settings are on line

changeable but if any of the fault is active than new setting will not be accepted. The position of the knobs is

indicated by the arrow as shown in the figure below. The following examples further clarify this.

EXAMPLE 1 :

Changing long time pick-up (LTP) from 0.95 to 0.5 times In

0.501.00

0.95

0.90

0.850.80

0.70

0.65

0.501.00

0.95

0.90

0.850.80

0.70

0.65Set at 0.95 X In Set at 0.5 X In

8.2.4

When the breaker trips under long-time protection, the cooling time allowed affects the subsequent

trip-time when the breaker is re-energized under fault condition. This feature can be switched off by the

ON/OFF dip switch, provided on the release facia. It is advisable to use a screwdriver to change the switch

position.

THERMAL MEMORY

0.75

0.60

0.75

0.60

8-9

8.3.1 FEATURES OF THE RELEASE

Current Transformer

The release is fed by three single tap current transformers of same rating as that of the circuit

breaker. This current is referred to as the nominal current (In) throughout this manual. The CT

rating on the secondary side is 750 mA.

The release SR21i is a micro-processor based over-current and earth-fault release designed

specifically for C-POWER breakers. It has four zones of protection in a single unit. The release

monitors and operates on the secondary currents of the current transformer (CT)

mounted on the breaker. The setable knobs on the facia enable the release to provide a wide

range of protection for various applications.

1 6 773 4 52 8 9

1

2

3

4

5

Current setting BCD Switches.

Power ON LED.

ON/OFF Switch for Thermal Memory.

Button to test the SR21i release.

Time Delay Setting BCD Switches.

6

7

8

9

Button to clear previous fault indication.

Connector for External Testing through SRT-2 Kit.

Query button - for indicating the last fault.

LEDS for fault indication.

8.3 MICROPROCESSOR BASED RELEASE TYPE SR21i

The release provides the four zones of protection by an electronic circuit with a micro-processor as the

central processing unit.

The four zones of protection are

1) Protection against overload : In Long time zone

2) Protection against short circuit : In Short time zone

Instantaneous zone

4) Protection against earth fault : In Ground fault zone

It trips the breaker through a Flux Shift Device (FSD) which is mounted on the rear bottom side of the

release. The Flux Shift performs the tripping operation through a link connected to the trip rod of the

breaker. The release is reset by the main shaft of the breaker at the end of the opening operation for

auto-reset type ACBs. For ACBs with local reset feature, resetting is done with the help of the local

‘TRIP/RESET’ or ‘TRIP/LOCK/RESET’ Push button.

3) Protection against short circuit : In

The complete list of abbreviation used is given below

In : Nominal current STD : Short Time delayIr : Rated current GFD : Ground Fault delayLTP : Long Time Pick-up LT : Long Time TripSTP : Short Time Pick-up ST : Short Time TripIp : Instantaneous pick-up INS : Instantaneous TripGFP : Ground Fault pick-up GF : Ground Fault TripLTD : Long Time delay ZSI : Zone Selective Interlocking

Table1 lists the setting range in all four zones of protection. The settings at the time of shipping are given at the end of the table.

* Inst. max. = Inst. OFF . So Positioning the knob to max position will suppress the corresponding

protection.

Setting for all are done by rotary BCD switches having red knob for pick-up currents and blue knobs

for time delays.

Factory Settings:

LTP =1.0, LTD-2s., STP=6, STD=60 ms., Ip=8, GFP=0.3, GFD=100 ms., Thermal Memory = OFF.

Note : Please change release setting as per your system protection requirement to ensure effective

protection.

8-10

PICK-UP CURRENT

Ir = 0.5 to 1.00 times In

Steps: 0.50, 0.60, 0.65, 0.70, 0.75

0.80, 0.85, 0.90, 0.95, 1.00

Operating Limit: 1.05 to 1.2 times Ir

SETTING RANGE OF SR21i

2 to 10 times In

Steps: 2, 3, 4, 5, 6, 7, 8, 9 and 10

Ip = 2 to 16 times In

Steps: 2, 3, 4, 6, 8, 10, 12, 14, 16

One position as max

Tolerance: ± 15% of fault current

0.2 to 0.6 times In

Steps: 0.2, 0.3, 0.4, 0.5, 0.6

TIME DELAY

0.2 to 30 sec. at 6 Ir

Steps: 0.2, 0.5, 1, 1.5, 2, 3.5, 6, 12, 17

and 30 sec

Tolerance: ± 10% of current.

20 ms to 600 ms.

Steps: 20, 60, 100, 160, 200, 260, 300,

400, 500 and 600 ms.


100 ms to 400 ms.

Steps: 100, 200, 300, 400 ms. & OFF


Type of

Protection

Long Time

Short Time

Instantaneous

Ground

Fault

-*

1

8-11

8.3.2 CHARACTERISTIC CURVE

A typical four zone time-current curve provided by the release is shown

1. Long Time protection zone

2. Short Time protection zone

3. Instantaneous protection zone

4. Ground Fault protection zone

5. Asymptote for Long Time protection

The required characteristic curve can be chosen by selecting proper settings. The settings can be

changed as described below.

Fig. 8-7

Facia Cut-out cover

has to be removed

to change knob

positions.

Red knobs are used for

setting the pick-up currents,

whereas the knobs for

time-delay setting are blue.

The settings can be made by

changing the knob positions

using screw-driver.

OFF

TRIPOFF

TRIP

8.3.3 CHANGING OF SETTINGS

The position of the knobs is indicated by the arrow.

5

1

2

3

4

Current

Trip time

Set at 0.5 x In0.95

1.000.50

0.600.65

0.700.75

0.800.85

0.90Set at 0.95 x In

0.951.00

0.500.60

0.65

0.700.75

0.800.85

0.90

8-12

TABLE II : LONG TIME PICK-UP CURRENT (Ir) FOR VARIOUS SETTINGS (A)

8.3.3.2 LONG TIME DELAY

One out of ten possible inverse time-current

characteristics can be selected by choosing

the delay at six times the rated current (Ir).

Fig. 8-8

8.3.3.1 RANGE OF PROTECTION

LONG TIME PICK-UP : The release rating (Ir) can be selected by the LTP switch from 0.5 times

(50%) to 1.0 times (100%) the rating of the breaker. Table II gives the selected rated current (Ir)

for different positions of the LTP switch for the entire range of breakers.

In 800 1000 1250 1600 2000 2500 3200 4000

400

480

520

560

600

640

680

720

760

800

0.5

0.6

0.65

0.7

0.75

0.8

0.85

0.9

0.95

1

500

600

650

700

750

800

850

900

950

1000

625

750

812

875

937

1000

1062

1125

1187

1250

800

960

1040

1120

1200

1280

1360

1440

1520

1600

1000

1200

1300

1400

1500

1600

1700

1800

1900

2000

1250

1500

1625

1750

1875

2000

2125

2250

2375

2500

1600

1920

2080

2240

2400

2560

2720

2880

3040

3200

2000

2400

2600

2800

3000

3200

3400

3600

3800

4000

LTP 5000

2500

3000

3200

3500

3250

4000

4250

4500

4750

5000

6300

3150

3780

4095

4410

4725

5040

5355

5670

5985

6300

0.1

1

10

100

1000

10000

1 1.2 1.5 2 6 10 14 20

0.01

Trip

tim

e in

se

c

Multiples of Set Current

8.3.3.4 INSTANTANEOUS

The release provides instantaneous (with no intentional time delay) protection against short-circuit

in this zone. The instantaneous pick-up current (IP) can be varied from 2 to 16 times In. The

characteristic curve changes with change in I setting, as shown below in Fig. 8-10. Table III lists

instantaneous pick-up currents for all I settings for all ratings of breaker.

P

P

The Characteristics curve changes with change in I setting. P

Instantaneous can be switched off by putting the I switch to the position marked ‘MAX’.P

8-13

8.3.3.3 SHORT TIME

The release provides time-delayed protection against short circuit in short protection zone. The

short time pick-up current (STP) can be varied from 2 to 10 times In and the definite delay (STD)

can be set from 20 to 600 ms.

The characteristic curve changes as per Fig. 8-9 given below, as STP & STD are changed.

In 800

1600

2400

3200

4800

6400

8000

9600

11200

12800

2

3

4

6

8

10

12

14

16

1000

2000

3000

4000

6000

8000

10000

12000

14000

16000

1250

2500

3750

5000

7500

10000

12500

15000

17500

20000

1600

3200

4800

6400

9600

12800

16000

19200

22400

25600

2000

4000

6000

8000

12000

16000

20000

24000

28000

32000

2500

5000

7500

10000

15000

20000

25000

30000

35000

40000

3200

6400

9600

12800

19200

25600

32000

38400

44800

51200

4000

8000

12000

16000

24000

32000

40000

48000

56000

64000

Ip 5000

10000

15000

20000

30000

40000

50000

60000

70000

80000

6300

12600

18900

25200

37800

50400

63000

75600

88200

100800

Fig. 8-9

STD

Triptime

STP Current

CHARACTERISTIC CURVE

In this zone, the release provides time delayed protection against earth fault. The ground fault

pick-up (GFP) can be set from 0.2 to 0.6 time In. The delay (GFD) is settable from 100 to 400 ms

in four equal steps. Table IV lists the ground fault pick-up currents for all ratings of ACB for various

settings of GFP.

8.3.3.5 GROUND FAULT

The ground fault protection can be switched off by putting the GFD switch to the position marked

‘OFF’.

Knob setting position for ground faultprotection switched off

Triptime

IP Current

8-14

In 800

160

240

320

400

480

0.2

0.3

0.4

0.5

0.6

1000

200

300

400

500

600

1250

250

375

500

625

750

1600

320

480

640

800

960

2000

400

600

800

1000

1200

2500

500

750

1000

1250

1500

3200

640

960

1280

1600

1920

4000

800

1200

1600

2000

2400

GFP5000

1000

1500

2000

2500

3000

6300

1260

1890

2520

3150

3780

23

4

6

810

12

14

16

MAX

Ground Fault Protection

Ground Fault

The characteristic curve change in GFP & GFD, as shown below in Fig. 8-11

Knob setting position for ground

fault protection switched off

Triptime

GRD

GFP Current

8.3.4 THERMAL MEMORY (For SR18/SR18G/SR21i/SR71)

Every time electrical power system is overloaded, there are thermal stresses induced in the

system. Thermal stresses caused by repetitive overload faults,can damage the insulation material used in

power system, if the threshold temperature is exceeded (Threshold temperature is the maximum operating

temperature) . The thermal memory feature re leases record the thermal

stresses induced in the system. This thermal memory ensures reduced tripping time in case of subsequent

overload faults. Hot/Cold curves take into account integrated heating effects to offer closer protection to the

system.

8-15

Intelligent Microprocessor Based Release

Threshold

Temperature

of insulation

Tem

pe

ratu

re

Temperature at subsequent

fault (incase of release

without Thermal memory)

2nd Fault1st FaultNormal

Normaloperating temperature

Temperature at 1st fault

‘X’ sec <‘X’ sec

095 C0105 C

0120 C

060 C

Temperature

At Subsequent fault

(in case of release)

Fig. 8-12

Fig. 8-11

10

1

0.1

0.01

0.20.1 06 X In

Multiples of Rated Current

Trip

tim

e in

se

c

400 300

200OFF

100

8-16

A, B, C, D and E are ACBs with intelligent releases having zone selective interlocking & are connected in

cascade as shown by dotted line. Short time delays are as indicated to achieve time based discrimination

between upstream & downstream breakers.

When a fault occurs in zone ‘Z’, breaker ‘E’ trips after a delay of 100ms*, and breaker ‘C’ and ‘A’ follow

delays of 200ms* and 300ms*, respectively, if required. But in case of a fault at ‘Y’, breaker ‘C’ trips after a

delay of 60ms* (a default value), instead of 200ms*. Thus saving your system of seeing the fault for another

140ms. Similarly a fault in zone ‘X’ results in breaker ‘A’ tripping after a delay of 60ms*, thus achieving

intelligent discrimination.

Z

Y

X

A 300 ms

C 200 msB 200 ms

D 100 ms E 100 ms

*Breaker opening time additional

Single line diagram for ZSI

Fig. 8-13

If time delay for overload protection is set at ‘x’ sec, then a release without thermal memory trips the ACB in

‘x’ sec each time an overload fault occurs, even if it is of a repetitive nature. Line for threshold temperature

of insulation depicts such a case, where temperature overshoots threshold temperature, causing damage

to the insulation.

However, protection releases in ACBs are intelligent to detect a repetitive fault. Here, thermal

memory takes into account the stresses caused due to the previous thermal fault resulting in faster

tripping (< ‘x’ sec in this case) of the release, and hence temperature rise is limited to a lower and safer

level.

ZONE SELECTIVE INTERLOCKING (ZSI)

Zone selective interlocking enables faster clearance of faults thereby reducing the thermal and

dynamic stresses produced. This minimizes the damage to the system, thus enhancing the useful

life available to the users.

8.3.5

TEST KIT SRT-2 The test-kit simulates setable phase (Long time, short and

Instantaneous) and ground fault conditions which can be injected

to the release through the TEST connector provided on the front

facia of the release. The release can be tested for its characteristics

by applying this input.

Test-Kit can simulate the following fault currents,

For phase fault : 2.5, 4.5, 6.5, 9.5, 11 and 13 times In.

For ground fault : 0.25, 0.35, 0.45, 0.55 times In.

8-17

8.3.6 TESTING

Release SR18/SR18G/SR21i can be tested for its functions using test-kit type SRT-2. The release

should be tested with the breaker in isolated or test position. The releases should never be tested when

the breaker is carrying current.

8.3.6.1 PHASE FAULT TEST PROCEDURE

The release can be tested for Long time, Short time and

Instantaneous zone of protection in the following manner,

I. Connect the 9-pin D-sub connecter in the test-kit to

TEST socket on the release.

II. Connect the power supply of the kit to 240 V, 50 Hz

supply. Ignore the reading shown on the LED time

indicator of the test-kit.

III. Select a suitable test-current from the left-side current

setting knob of the test-kit.

EXAMPLE :

If the release is set for LTP = 0.5, STP = 6, IP = 8 then, test

current 2.5 x In will trip the release in Long time. However

for test current of 4.5 or 6.5 x In, the release will trip in short

time, and for all other current it will trip instantaneously.

IV. Start test by setting the 3-postion TEST switch on the test-kit to PHASE FAULT side. The display on

the kit will reset to zero and start counting till tripping takes place. After tripping the input to the release

is automatically cut-off and display shows the trip time.

V. Test-current can be changed and the release can be re-tested be changing the TEST switch position

to OFF position and then setting it back to PHASE fault.

8-18

CAUTION :

No or loose connection will result in CT secondary remaining open, which creates very high

voltage when the breaker carries current, possibly damaging the CT and the release.

8.3.6.2.GROUND FAULT

The release can be tested for ground fault in a similar way by first selecting the appropriate ground fault

test current and setting the 3-POSITION test switch to GROUND FAULT position.

Power supply unit test need not be conducted if the POWER LED on the release facia keeps on blinking

when the breaker is carrying more than 15-20% of the nominal current.

TEST PROCEDURE

I. Disconnect the D-Sub connecter from the release TEST socket.

II. Remove the CT connector from the rear side of the release. (MUST BE PUT BACK TIGHTLY

AFTER THE TEST IS OVER)

III. Connect the 9-pin shrouded connecter of the test-kit at the CT connector of the release.

IV. Set the 3-way sliding switch (given at the back-side of the kit) to any of the R, Y, or B phase.

V. Set the Ground Fault pick-up value of the release to 0.4 x In and delay as 400ms.

VI. Pass single phase current by pressing the TEST switch of the kit given at the back. The time

display goes blank when current is passed. The release will reset the status indicators to black

position and will trip in Ground Fault. This test can be repeated for the other phases by changing

the slide-switch position.

VII.Remove the shrouded connector from the release and put the CT connector firmly in its place.

8.3.7 SALIENT POINT

1. The release operates from CT currents only. It uses special CTs which have 750mA secondary

current.

2. In normal operating mode,

a) None of the LEDs will glow, when current is carried by the breaker.

b) The POWER ON LED blinks of the low frequency. When current through the breaker exceeds

the rated current (Ir), the blinking becomes faster indicating overload condition.

c) LED can be reset by pressing the clear push button.

d) POWER ON LED will start blinking only when breaker starts carrying a minimum current of

15% of In.

3. In case of a fault,

a) Respective LED will glow only after pressing the query push button. For example, if the

breaker trips in short time, then that particular short time LED will glow only after pressing

query push button.

b) The breaker gets automatically reset after tripping in case of an ‘Auto Reset’ type of breaker.

For a ‘Local Reset’ type of breaker the Trip/Reset push - button needs to be pressed for

resetting. Respective fault LED will glow.

8-19

8.4 ELECTRICAL ANTI-PUMPING

When a closing command is given, closing coil of the circuit breaker gets supply

through a normally closed (NC) contact of the anti-pumping contactor. The closing coil is

energized and the breaker closes. The auxiliary contact Q1 of the breaker closes. This

energizes the coil K1 of the anti-pumping contactor and the contactor picks up. This opens its

normally closed (NC) contact in series with the closing coil breaking the persistent closing

command. In order to close the circuit breaker again, the closing coil circuit will have to be

reset, which will happen only after the anti-pumping contactor drops off. The contactor will drop

off only when the closing command is removed. This ensures that once the breaker has closed

and tripped on fault the breaker can close again only after the first closing command is

removed and a fresh closing command is given, thus providing anti-pumping. The anti-

pumping contactor should be selected in accordance with the rating of the closing coil.

(

(

D

C

(

EC

D

F H

B

A

K1CC

(( EE

K1

K1

Q1

Closing Command

Anti-pumpingContactorClosing

Coil

C6Service

Test

BreakerContact

Spring Charging Limit Switch

Spring Charging Motor

ELECTRICAL ANTI-PUMPING

Fig. 8-14

9. ACCESSORIES

Shunt release coil is short time rated and is disconnected from the

circuit by an auxiliary contact (CA-1) when the ACB is in open

condition.

9-1

Remote tripping of the circuit breaker can be accomplished by

the aid of shunt release which is offered in two designations viz :

- Type EA for DC application, (65-130% of rated voltage)

- Type EA1 for AC application (10-130% of rated voltage)

This release permits closing of breaker contacts if the voltage is

above 80% of the nominal voltage and trips the breaker if the

voltage falls below 35% of the nominal voltage.

- Type MV - with no intentional time delay

- Type MVR - with a fixed time delay of 3

When U/V release is provided, the ACB can be closed only when

supply is available to the U/V release.

±1.5 sec.

Auxiliary contacts are offered in following combinations :

2 NO + 2 NC

6 NO + 6 NC

Note :Number of aux. contacts available to customers may

be less than actual, as some aux. contacts may be

used for internal wiring purpose.

• Self aligned, spring loaded, fully drawout type

• Required for control circuit connections

• Maximum four blocks, each of six contacts

• The contacts are rated at 16A, 500V AC

9.1.4 SECONDARY ISOLATING CONTACTS (SIC) :

Note :

Refer clause 9.8.7 for technical data.Refer clause 13.1for detail wiring diagram.

9.1.2 UNDERVOLTAGE RELEASE :

9.1.1 SHUNT RELEASE :

9.1.3 AUXILIARY CONTACT :

- O

-

ffered both in AC and DC rating

- Spring charging time: 7 sec (approx.)

For 415V application, use a 415V/240V transformer rated for

500 VA

- For DC control applications, the circuit must be wired for

double isolation if AC control to DC control conversion is done.

9.1.5 SPRING CHARGING MOTOR :

Electrical charging of the main spring can be achieved by using

motor.

9-2

Note : Refer technical data

clause 9.8.7 for Refer clause 13.1for detail wiring diagram.

9.1.6 CLOSING ELECTROMAGNET :

Closing electromagnet actuates the closing of electrical breaker, by

discharging main spring.

- Offered both in AC and DC rating

- Coil of the closing electromagnet is continuously rated

- In case of DC closing electromagnet, economy resistors* is

used in series with closing electromagnet.

*Refer technical data for resistor details.

9.1.7 AN 1 - ANNUNCIATOR MODULE :

Note : Providing continuous supply to the motor would ensure that the main spring gets charged

after ‘Close’ operation and is ready for the next operation.

• Individual fault annunciation by LEDs for

- Long time fault

- Short time/Instantaneous fault

- Ground fault

• Can be used with release type SR18/SR18G & SR21i

• One potential free contact rated 5 A at 230V AC available for

each type of fault

• Flush mounting on panel

• Operating voltage : 240V AC / 110V DC. Other voltages

available on request

• Dimension of A1 module = 96mm x 48mm x 114mm (HxWxD)

• Door cut out dimension = 92mm x 46mm

9-3

9.2 FAULT TRIPPING INDICATION ON OVERLOAD & SHORT CIRCUIT :

View of the mechanism from front

View of DN1 release without cover

ACB tripping indication provided with one change-over contact

available for the following :

Common indication for tripping through protection units

• Available for release type DN1/SR18/SR18G/SR21i/SR71 as

an option

• Provided by microswitch C1 fitted in the ACB

Separate indication for tripping due to overload and short

circuit faults

• Provided for release type DN1 by microswitch C1 fitted inside

the ACB and microswitch C2 fitted inside release

Separate indication for tripping due to overload, short circuit

& earth faults

• Available for releases type SR18/SR18G/SR21i Provided by

AN1 annunciator module to be separately mounted on the panel

for remote fault annunciation

• Provided by LEDs in SR71/SR18/SR18G/SR21i releases, for

local annunciation

Refer clause 12.2.5 for schematic arrangements of fault indication

systems.

Displays total number of breaker operating cycles and is

mechanically operated.

9.1.8 OPERATION COUNTER :

9-4

9.3 FAULT TRIPPING INDICATION ON VOLTMETRIC RELEASES MICROSWITCH

Indication for shunt release operation

• Provided by microswitch C5 fitted on the shunt release

Indication for undervoltage release operation

• Provided by microswitch C3 fitted on the undervoltage release

Note :

This microswitch can be used for an indication system or any

other transducer viz. electrical interlocks, alarm, etc.

View of cradle from front

9.4 MICROSWITCHES FOR INDICATING POSITION OF THE BREAKER ON THE CRADLE

C8 C6C7

C9

Door Interlock

Racking Interlock

Locking in ‘Isolated’ Position

View of the cradle

9.5 RACKING INTERLOCK

Note : Refer clause 9.8.7 for technical data.

• Electrical indication available through microswitches

• Two microswitches with one changeover contact for

I) Test or Isolated position (C8 & C9)

II) Service (C6 & C7)

• In case of an electrical ACB, a service position microswitch

is fitted on the left side as a standard. This can be used to

prevent remote closing of ACB in ‘Test’ & ‘Isolated’

positions

• Before initiation of racking operation, the key of the lock is

to be pressed and turned anticlockwise. Otherwise the

racking operation gets mechanically prevented

• In case the breaker is in closed condition, pressing of the

key trips the breaker between the Service and Test

positions.

• The key remains trapped in the lock when not pressed

and this makes it suitable for interlocking.

NAME APPLICATION

9.6 DETAILS OF DIFFERENT MICROSWITCHES

LOCATION NO. OF SIC’S FORWIRING

C1

C2

C3

C5

C6

C7

C8

C9

3

3

2

2

2

2

2

2

Inside theACB

Inside theDN1 release

On the U/V release

On the shunt release

In cradle

In cradle

In cradle

In cradle

Common of tripping due toO/L, S/C & G/F

Separate indication of trippingdue to O/L, S/C & G/F

Indication of U/V release operation

Indication for shunt release operation

Service position-Left

Service position-

Test or isolated position-

Test or isolated position-

indication

Right

Left

Right

9-5

9.8.1 LOCKING IN ‘ISOLATED’ POSITION / ‘ANY’ POSITION

9.8.1.1 Locking in ‘Isolated’ position

In case number of feeders are fed from two sources e.g. a

main supply source and standby generator and it is

necessary that only one source is connected to the bus

bars i.e. only one of the circuit breakers (X & Y) feeding

supply to the feeders can be switched ‘ON’ at any given

time. To achieve this interlock identical locks are fitted on

the two breakers and only one key is kept in the custody of

the attendant.

1. Cam on telescopic rail.

2. Microswitch (C8/9) in test or isolated position.

3. Microswitch (C6/7) in service position.

9.7 OPERATION OF MICROSWITCHES

LOCKING SYSTEM FOR THE BREAKER

Locking system arrangement in Air Circuit Breakers are offered as follows:

For drawout breakers only

- Locking in ‘Isolated’ position / ‘Any’ position

- Door Interlock

- Racking interlock

- Rating Error Prevention

For both drawout and fixed breaker

- Lockable trip push button

9.8

}

‘Service’ position : The microswitch operates 3 mm before the ‘service’ position

‘Test’ position : The microswitch operates 3 mm before the ‘test’ position during withdrawal

‘Isolated’ position : The microswitch operates 2 mm before the ‘Isolated’ position

Fig. Microswitch Mounting For Position Indication.

On cradle.

1

1

2

2

3

3

RIGHT SIDE

LEFT SIDE

X Y

A B C D

Main Supply

Standby Generator

9-6

These locks are so designed that when the lock is in released position, i.e. open, key cannot be

removed.

If breaker X is closed and changeover to breaker Y is required, then breaker X has to be

tripped and racked out to ‘Isolated’ position. Locking of the breaker X is possible in its ‘Isolated’

position and the key can be removed to unlock the other breaker Y, Breaker Y can now be racked

into ‘Service’ position and closed. As breaker X is locked in ‘Isolated position and the key is trapped

in the lock of Y, X cannot be put into service position. This serves the purpose of interlocking.

Operation

Withdraw the breaker to ‘Isolated’ position. Turn the key clockwise and remove from the lock.

Locking in ‘Any’ position

The operation is similar to that explained but can be locked in any position viz. Service,

Test or Isolated.

DOOR INTERLOCK

9.8.2.1 Door Open and Breaker in ‘Isolated’ position.

9.8.1.2

9.8.2

When the door is open, the spring-loaded pin interferes with the screw (refer Fig. 4)

and hence the racking screw cannot be turned. However, when the door is closed, the pin is

pressed and the screw is free to rotate. The breaker can be racked now.

Breaker in ‘ISOLATED’ position

• Breaker can be locked & key can be removed

• Breaker cannot be racked in

Fig. 2

Breaker in ‘SERVICE’ or ‘TEST’ position

• Breaker cannot be locked

• Key cannot be removed

Fig. 3

9-7

This arrangement ensures that the breaker cannot be racked to the ‘Test’ and ‘Service’ position

unless the door is closed.

The door interlock can be defeated by rotating the screw on the cubicle door in anti-clockwise

direction using a screw driver.

When the breaker is in ‘Isolated’ position, make sure that the position of the top end of the lever

results in its movement in anti-clockwise direction. Check that on removal of the pressure, the lever

comes back to its original position due to spring action.

9.8.2.2

as shown in Fig. 6

Door closed and breaker in ‘Service’ / ‘Test’ position :

When the breaker is racked in, the pin on the left side plate of the breaker presses the lever as

shown in Fig. 5 . The rear portion of the lever rises & comes in front of the latch piece fixed to the

cubical door . The interference between the latch piece and the lever prevents

the door from opening. However, when the breaker is withdrawn to the ‘Isolated’ position, the door

can be opened since the lever is not pressed by the pin of the breaker side plate and hence there is

no interference between the latch piece and the rear portion of the lever.

DOOR OPEN (Screw will intefere with pin)

Fig. 6

Breaker in ‘Test’/ ‘Service’ PositionBreaker in Isolated Position

Fig. 5

Fig. 4

PIN SCREW

Door Interlock

BreakerPin

Lever

Latch piece

Bracket Door

Lock plats

50

Cradle

Latch Piece

Lever L

DoorBusbar

9-8

9.8.6 AUTOMATIC SAFETY SHUTTER FOR DRAWOUT BREAKERS

The shutter automatically covers the cradle terminals (which may be live) once the breaker is drawn

out of ‘Service Position’. This is to avoid accidental contact of the operating personnel with live parts

during maintenance.

9.8.5 LOCKABLE TRIP PUSH BUTTON :

This system replaces the normal trip push button by a lockable one and used for the purpose of locking

& interlocking. The push button is suitable for both Manual and Elecrical, Draw-out and Fixed Breakers

of all ratings, which makes interlocking between any version and rating possible. The system defeats all

positive closing signals (manual / electrical) and prevents nuisance closing of the locked breakers. The

key remains trapped on the push button once unlocked which makes it suitable for interlocking and

gives easy access (if one desires) to lock the breaker.

9.8.4 RATING ERROR PREVENTION :

The breaker and cradle are fitted with ‘rating error prevention’ feature. Any mismatch of the breaker and

cradle rating will be prevented, as the breaker having any rating other than that of the cradle, cannot be

fitted on the telescopic rail of the cradle.

9.8.3 RACKING INTERLOCK

- Before initiation of racking operation, the key of the lock is to be pressed and turned anti-

clockwise. Otherwise the racking operation gets mechanically prevented

- In case the breaker is in closed condition, pressing of the key trips the breaker between the

positions ‘Test’ and ‘Service’

- The key remains trapped in the lock when not pressed and this makes it suitable for interlocking

PUSH TO TRIPTURN ANTI - CLOCKWISE TO LOCK

9-9

For E-Range BreakersFor S1/C/H/D-RangeBreakers

9.8.7 TECHNICAL DATA FOR ACCESSORIES :

SHUNT RELEASE:

ACCESSORIES TECHNICAL DETAILS

Type of Release

EA1

EA

Nominal Voltage

Use (V)

240 AC

415 AC

24V DC

48V DC

110 DC

220 DC

PowerConsumption at

pick up

800 VA

800 VA

32 W

125 W

45 W

30 W

Operating

Limits

10-130% V

65-130% V

Note : Other voltage available on request

Nominal voltage

Pick up (V)

Drop off (V)

VA Consumption

240V & 415V 50Hz AC,

220V & 415V 60Hz AC, & 24V DC

80% Ue

35-65% Ue

Pick up - 23 VAHold on - 8.5 VA

UNDER VOLTAGE RELEASE

MICROSWITCH

Rated voltage

(V)

125 AC

250 AC

30 DC

125-250 AC

415 AC

30 DC

110 DC

220 DC

Rated current for resistive circuit

(A)

5.0

2.0

2.0

10.0

5.0

8.0

0.5

0.2

Type

C2

C1, C3

C5, C6

C7, C8, C9

Watt loss 6 W

9-10

Continued...

110 AC 800 VA

ACCESSORIES TECHNICAL DETAILS

240V, 50Hz

110V DC

220V DC

300VA

154W

Rated voltage (Us) Power Consumption Range of operation

85-110% Us

110V, 50Hz

240V, 50Hz

220V, 60Hz

110V DC, 220V DC24V,30V,48V DC

Rated Voltage(Us)

Range of

operation

85-110% Us

Power Consumption

Hold-onPick-up

320VA

300W

50VA

50W

Rated dc Voltage (V)Economy

resistor (ohm)

SPRING CHARGING MOTOR

CLOSING ELECTROMAGNET

ECONOMY RESISTOR 24V DC

30V DC

48V DC

110V DC

220V DC

16 (ST24202)

24 (ST17402)

62 (ST16890)

360 (XK52076)

1000 (XK52071)

AUXILIARY CONTACTS

Voltage(V)

Rated current(A)

24 to 415AC

250V DC

16

1.2

24 to 415 AC

250V DC

ElectricalCircuit

Resistive

Non-resistive

=L/R = 15ms with 2 NO or 2 NC contact in series

Largest permissible cylindrical fuse (as per IEC 60269) 16A

Largest permissible MCB with C-characteristics 16A

Note : Short-circuit protection

9.8.7 TECHNICAL DATA FOR ACCESSORIES :

9-11

16

1.0

10. MAINTENANCE & TESTING

10-1

10.1 MAINTENANCE SCHEDULE:The frequency of maintenance depends essentially on service condition viz. frequency of operation,

tripping on fault, relative humidity and presence of dust and reactive gases etc.

The mechanical / electrical life figures of manually or electrically operated CN-CS..E; CN-CS..G;

CN-CS...S1; CN-CS..D & Air Circuit Breakers are as under:

CN-CS 400E to CN-CS 1000E 15,000 operating cycles

CN-CS 1250E to CN-CS 2000E 20,000 operating cycles

20,000 operating cycles






The arc chutes and arcing contacts are suitable for the following kinds of service without maintenance at rated

current and voltage.

CN-CS 800C to CN-CS 1000C 8,000 M-B operating cycles




CS-CS 800H to CN-CS 1000H 8,000 M-B operating cycles

CN-CS 1250H to CN-CS 1600H 7,000 M-B operating cycles

CN-CS 2000H to CN-CS 2500H 5,000 M-B operating cycles

CN-CS 3200H0 / H1 to CN-CS 4000H0 / H 5,000 M-B operating cycles OR

Break operation followed by two make-break operations at rated making / breaking(M-B) capacity (Please refer

IS 13947 (part 2) or IEC 60947-2)

25 make-break operations at six times the rated current at nominal voltage.

The main contacts and all the other components of the breaker are designed to last for the entire

mechanical/elecrical life of the breaker. It is, however, recommended to carry out inspection as per the schedule

mentioned below:

After every 3000 mechanical operations

ORAfter six months of service, if exposed to dust

OR After an idle period longer than six months

OR Every year

During the course of inspection, check first the general service conditions of the breaker. Carry out operations

described in Section 5 (these operations can be carried out in ‘Test’ position for draw-out breakers). Subsequently, check the operating requirements enumerated in Section 5, which may require readjustment in certain cases.

CN-CS..C, CN-CS..H

CN-CS 400G to CN-CS 2000G 20,000 operating cycles

CN-CS 630S1 to CN-CS 2500S1

CN-CS 3200S1 / C

CN-CS 800C to CN-CS 2500C

CN-CS 3200D / 4000C to CN-CS 6300C

CN-CS 800H to CN-CS 2500 H

CN-CS 3200H0 / H1 to CN-CS 4000H0 / H

CN-CS 400E to CN-CS 1600E 6,000 M-B operating cycles

CN-CS 2000E 4,500 M-B operating cycles

CN-CS 400G to CN-CS 1000G 8,000 M-B operating cycles

CN-CS 1250G 7,000 M-B operating cycles



CN-CS 630S1 to CN-CS 1000S1 8,000 M-B operating cycles

CN-CS 1250S1 to CN-CS 1600S1 7,000 M-B operating cycles

CN-CS 2000S1 to CN-CS 3200S1 5000 M-B operating cycles

OR

10.2 DETAILS OF MAINTENANCE, THAT CAN BE CARRIED OUT ON THE BREAKER

ARE AS UNDER :

10.2.1. ARC CHUTE

- Clean the insulating surface and anti-arc strips covering the inside of the arc chutes by the aid

of a dry piece of cloth.

- At the end of its electrical life, it is recommended that arc chutes be reassembled after turning

the anti-arc insulating strips (inside the arc chutes) around. This will expose fresh surface to

face arcing and will double the life of the arc chutes. The arc chutes need to be replaced

subsequently.

10.2.2. POLE

- Clean the insulating pieces (hylam piece on both the sides of the contacts).

- Close the breaker and check the arcing contact gap.

It is necessary to readjust the fixed arcing contact if the gap is greater than 1.5 mm.(Refer fig.10-4).

It is not necessary to clean them, even if erosion is observed on the contact buttons. However the fixed

and moving arcing contacts should be replaced when the thickness of the button gets reduced to 0.5

mm. The anti-arc strips (hylam pieces on both the sides of the contacts) should also be

replaced simultaneously. Erosion marks on the main contacts if any will not affect the operation of the

breaker. The contact surface can be cleaned with fine emery cloth and wiped thoroughly (the main

contacts cannot be replaced). However in any case if the moving fingers of a pole appears misaligned,

it is not going to affect the performance of breaker.

10.2.3. ASSEMBLY OF THE BREAKERS

The pole assemblies are maintained under pressure by six special screws located on the side

plates of the breakers. The tightening torque need to be checked as per instructions given later in

the chapter. (refer clause 10.3.7).

10.2.4. OVERCURRENT AND VOLTMETRIC RELEASE

The release DN1, SR18, SR18G, SR21i, SR71, MV, EA, EA 1 etc. do not require any maintenance.

Check that tripping and resetting are as per the test instructions given in clause 10.3.2 to 10.3.6.

10.2.5. GREASING

A breaker normally greased and operating in dust free and non corrosive atmosphere over a period of

two years can undergo its normal cycle of mechanical endurance without greasing. As ideal service

conditions are hardly encountered, it is recommended to re-grease the breaker after a cycle of 500

operations or six months, whichever is earlier. (Please refer to the Fig. 10.1 & 10.3 for details of parts to

be greased).

10.2.5.1 Components to be greased

All rubbing surfaces in the mechanism, poles etc. are to be greased except the contacts (copper on

copper) and sintered bearings.

Prior to greasing, these surface should be thoroughly cleaned. Excess grease must be wiped out.

Note : Please do not use any cleaning agent while cleaning with cloth.

if provided,

Grease sliding surface of fixed and moving secondary isolating

contacts with petroleum jelly.

10-2

Section view of manual breaker E range

COMPONENTS TO BE GREASED

P) Pins

1) Roller Assembly

2) Pole Latch Spring Retainer

3) Stainless Steel Profile

4) Slotted Guide

5) Pole Latch Nylon Rollers

Fig. 10-1

P PP 2

5

3 4P

P

P

P

P

P

P

P

P

P

1

10-3

Note : Please do not use any other grease than the recommended ones.

Lithon 2 of Hindustan Petroleum

Molygrease ML of Balmer Lawrie & Co. Ltd.

GREASE TO BE USED

SCHEDULE FOR GREASING:

Every 500 operations or 6 Months

Section view of manual breaker G/S1/C/H/D-Range


P) Pins

1) Roller Assembly



4) Slotted Guide


Fig. 10-2

P PP 2

5

3 4P

P

P

P

P

P

P

P

P

P

1

10-4




GREASE TO BE USED



SECONDARY ISOLATING CONTACTS

Sliding Surface of fixed and moving contact with petroleum jelly.

Fig 10-3

Section view of electrical breaker


P) Pins

1) Roller Assembly



4) Slotted Guide


6) Crank

7) Plate

GREASE TO BE USED



P P2

P 1

5

P

P

3

4 6

P

7

P

10-5



SECONDARY ISOLATING CONTACTS

Sliding Surface of fixed and moving contact with petroleum jelly.


10.2.5.2 Components greased for life

The following components are provided with self lubricating sintered rings impregnated with grease for

life.

- Trip rod

- Intermediate shaft of manual control

- Free return charging device for electrical operation

10.2.5.4 Components not to be greased

- All releases

- Main contacts in pole and cradle terminals

- Earthing terminal

- Secondary isolating contacts

10.2.5.5 Caution

Before any maintenance operation, following procedure must be followed.

- Mechanism spring must be discharged.

- Drawout breaker must be in isolated/maintenance position.

- Circuit breaker which operate rarely, must be periodically operated.

- Please contact our office/authorised service center in case of a problem arising during usage

10-6

Fig. 10-5

8 12

1090.9 ± 0.1

7Fig. 10-4

10.3 TEST INSTRUCTIONS

The adjustments and tests listed in the following pages are to be carried out after routine maintenance/

replacement of spares. For carrying out some of them, it may be required to remove the front facia. Follow

the procedure given as per clause 10.3.10 for removing the front facia.

Maintenance of the breakers is to be carried out of as per the recommendations mentioned earlier in this

section. The procedure for the replacement of spares will be as per Section 11.

10.3.1 POLE :

Refer to Fig. 10-4

Adjustment of arcing contacts :

Breaker is in ‘Closed’ condition. Move the fixed arcing contacts to obtain the dimension 0.9 ± 0.1 mm

between the fixed and moving arcing contacts.

Tightening couple of the screw (12) : 0.8 kg-m

Note :

Check the positioning of the arcing contacts again at the end of

the inspection schedule. Gap between the arcing contacts (fixed

and moving) 0.9 ± 0.1 mm. Maximum difference in this dimension

for the arcing contacts of the same pole should not be more than

0.1 mm.

Limit of wear = 1.5 mm

Tightening couple of the screws (9) and (10) : 0.25 kg-m

(moving arcing contact)

10.3.2 OVERLOAD AND SHORT CIRCUIT RELEASE TYPE DN1

10.3.2.1 TRIPPING

In ‘Open’ condition of the breaker, resetting adjustment screw (18) to

be unscrewed nearly completely (see Fig. 10-5).

The release being reset, adjust the connecting piece (19) to get the

dimension 1 ± 0.5 mm between the tripping striker (20) and the lug

(21) of latch (22) in the position of rest (Fig. 10-6).Red Varnish

18

1.5

10-7

10.3.2.2 Inspection

In ‘Closed’ condition of the breaker, check that there is a minimum

play of 0.5 mm between tripping striker (20) and the lug (21) of

latch (22) in the position of rest (See Fig. 10-6).

Limit of wear 0.1 mm.

Hold the crank (23) of the release and press the release strip (24).

Release the crank (23) slowly while keeping the strip (24) pressed

and see that the breaker trips (See Fig. 10-7).

Important

In order not to block the resetting of the release which takes place

when the breaker trips open, carry out the releasing operation of the

crank (23) with a hook (See Fig. 10-7).

10.3.2.3

10.3.2.3.1

RESETTING

AUTO RESETTING

In ‘Open’ condition of the breaker keep the DN1 release tripped.

Adjust the screw (18) to effect latching-on of the release. Screw 3/4

turn more to ensure a margin of safety for resetting (See Fig. 10-8).

Note : A very distinct click sound indicates latching-on of the release.

Inspection :

In ‘Open’ condition of the breaker, check for a resetting margin of safety of 1.5 mm by turning the main

shaft in the direction of closing.

Limit of wear : no latching.

Fig. 10-7

Fig. 10-6

1

05

±.

Red Varnish

Hook23

24

2022 21 19

Fig. 10-8

Red Varnish

18

1.5

10-8

10.3.2.3.2 LOCAL RESETTING

Breaker in ‘Open’ condition

The release being in tripped condition and the crank (26) resting

against the stop (27), adjust the connecting piece (44) to get the

dimension 1 ± 0.5 mm (See Fig. 10-9). Press the tripping push

button (28) and adjust the screw (29) to effect resetting of the

release. Unscrew one turn to ensure a margin of safety in resetting.

(Refer to Fig. 10-10)

Note : A distinct click sound indicates latching-on of the release.

Inspection

Breaker in ‘Open’ condition :

Press the push button, check for the safety margin of latching-on of 0.5 mm - the crank of the release

returns by this distance before finally latching-on.

With push button (28) pressed check for a minimum play of 0.2 mm between the lug (21) of the latch (22)

and the bottom of the slot.

10.3.3 MICRO-PROCESSOR BASED RELEASE TYPE /

.1 TRIPPING

In ‘Open’ condition of the breaker, the resetting adjustment screw (16)

to be unscrewed nearly completely.(See Fig. 10-11).

SR18G

SR 21i

10.3.3

1 ± 50.

Fig. 10-9

Fig. 10-10

27 44

26

30

29 28

0.2

Latched 0.522 21

Fig. 10-11

SR21i

RED VARNISH

EXTREME POSITION

OF RESET

16

10-9

Important

In order not to block the resetting of the release when the breaker trips open, carry out the releasing

operation of the bracket with the hook (see Fig. 10-13).

The release being reset, adjust the connecting piece (10) to get the

dimension of 1±0.5mm between the tripping striker (11) and the lug (12)

of the latch (13) in the position of rest (see Fig. 10-12).

Inspection

In ‘closed’ condition of the breaker, check that there is a minimum play

of 0.5 mm between the tripping striker (11) and the lug (12) of the latch

(13) in the position of rest (see Fig. 10-12).

Limit of wear : 0.1mm

Hold the bracket (14) of the release and given an intentional trip

command using the test kit for the release. Release the bracket (14)

slowly and see the breaker trips (see Fig. 10-13).

The breaker can be tripped by applying 18V DC across the points

(show in Fig. 10-14) on the D-subconnector of the release. The DC

source should be capable of delivering 6A continuously. It is to be

noted that one has to use a suitable connector for applying the

voltage. Care should be taken that the push button is not kept

pressed for more than 1 second. In case the test kit is not available,

this method can be adopted to give the trip signal to see the slow

tripping of the breaker as mentioned in the previous paragraph. Fig. 10-14

1± 0

.5

Fig. 10-12

Fig. 10-13

SR21i

SR21i

SR21i

RED VARNISH

13 12 11 10

HOOK

14

D - SUB CONNECTOR

18V DC

PUSH BUTTON

10-10

10.3.3.2

10.3.3.2 .1

RESETTING:

AUTO RESETTING

In ‘Open’ condition of the breaker and the release being in

tripped condition, adjust the screw (16) to effect latching-on

of the release. Screw 3-4 turns more to ensure the margin of

safety for resetting (See Fig. 10-15).

Note : A very distinct click sound indicates latching-on of the

release.

Limit of wire: no latching

10.3.3.2 .2 LOCAL RESETTING

Breaker in ‘Open’ condition

The release being in tripped condition and the crank (19) resting against the stop (20), adjust the connecting piece (21) to get the dimension of 1 + 0.5 mm (see Fig. 10-16). Press the tripping push button (23) and adjust the pin (24) to effect resetting of the release. Unscrew one turn to ensure a margin of safety in resetting (See Fig. 10-17).

In ‘Open’ condition of the breaker:

Press the push button, check the safety margin of latching-on of

0.5 mm the crank of the release returns by this distance before

finally latching-on. With push button (23) pressed, check for a

minimum play of 0.2 mm between the lug (12) of the latch (13) and the

bottom of the slot (see Fig.10-17).

Note: The instruction given in Clause above are also valid for

SR18, SR18G, SR21i and SR71 releases.

Inspection

10.3.3

Note: A distinct click sound indicates latching-on of the release.

Fig. 10-15

Fig. 10-16

Fig. 10-17

RED VARNISH16

OF RESET

EXTREME POSITION

192021

2325

24

13 12

.0

2

Sr21i

SR21i

1 ± 0.5

10-11

1

10.3.4 THE BREAKER NOT FITTED WITH OVERCURRENT

RELEASE

10.3.5

10.3.5.1

VOLTMETRIC RELEASES

TRIPPING

Refer to Fig.10-19

Inspection


Check for a minimum play of 0.5 mm between the lever (33) and the lug (21) of the latch (22) at rest.

10.3.5.2 RESETTING

Refer to Fig. 10-20.

In ‘Open’ condition of the breaker, adjust the screw (31) to bring

the striking pin (34) against the stop. Unscrew half a turn.

In ‘Open’ condition of the breaker, make sure of the following:

A minimum play of 0.5 mm between the tripping striker (20) and the lug

(21) of the latch (22) at rest. A minimum play of 2 mm between, the

resetting screw (18) and the tripping stricker (20).

Note: Trip rod should be locked to mechanism plate by using

(M4x25 CSK Screw).

In ‘Open’ condition of the breaker, unscrew the resetting adjustment

screw (31) nearly completely. The release being latched on, adjust the

connecting piece (32) to get the dimension 1±0.5 mm between the lever

(33) and the lug (21) of the latch (22) at rest.

Important

In order not to block the resetting of the release when the breaker trips open, carry out the slow releasing of

the striking pin with the help of a hook.

Hold the striking pin (34) as shown in the Fig. 10-19, free the latch of the release. Release the striking

pin slowly and see that the breaker trips.

Limit of wear: 0.1 mm

1 ± 0.5

Fig. 10-18

Fig. 10-19

2 Minimum

0.5 Minimum

20

22 21 18

34 22 21 33 31

32

Hook

Fig. 10-20

34 31

Varnish

2-minimum

10-12

Inspection

In ‘Open’ condition of the breaker, check if there exists a minimum margin of safety in latching-on of 2 mm.

Limit of wear : no latching.

10.3.6 BREAKERS NOT FITTED WITH VOLTMETRIC RELEASE:

Refer to Fig. 10-21.


Check if there exists a minimum play of 2 mm between the lever (33)

and the lug (21) of the latch (22) at rest. Check if there exists a minimum

play of 2 mm between the screw (33) and the crank (35).

10.3.7

±

10.3.8

10.3.8.1

TIGHTENING OF THE POLE ASSEMBLIES:

Breaker in ‘Open’ condition with special screws (1) loose

(See Fig. 10-22 and Fig. 10-23)

Close the breaker

A. For CN-CS 400A - CN-CS 2000A E/G & CN-CS 630A to CN-CS

3200A C/S1 & CN-CS 1600D breakers:

(Refer to Fig. 10-22) Tighten the special screws (1) so that the

difference in gaps between the external plates and the poles at the

two ends is not more than 1 mm (A= B 1 mm).

Tightening torque = 0.4 kg-m

B. For CN-CS 3200D/4000C & 5000/6300C 3P/4P breaker :

(Refer to Fig. 10-23) Tighten the special screws (1) such that the

fixed screws (2) of the inter-mediate plates (72) can be fixed and

rotated freely.

Tightening torque = 1.5 kg-m

C. For CN-CS 800A to CN-CS 2500A H & CN-CS 3200/4000H0 3P/4P

breaker :

(Refer to Fig. 10-23) Tighten the special screws (1) such that the

fixed screws (2) of the inter-mediate plates (72) can be fixed and

rotated freely.

Tightening torque = 0.4 kg meter.

MICROSWITCH FOR POSITION INDICATION (ON CRADLE)

Refer to Fig. 10-24

Microswitch in ‘service’ position

Adjust the screw (10) to ensure operation of the microswitch

3±0.5 mm before ‘Service’ position (eliminate the play on the

telescopic rails by pulling them).

A = ± B 1 A

Fig. 10-21

Fig. 10-22

Fig. 10-23

Fig. 10-24

21 72

RED VARNISH

RED VARNISH

2

1

B

2 minimum

2-minimum

22 21 33 35

31

10

12 11

10-13

10.3.8.2

±

10.3.8.3

±

Microswitch in ‘Test’ position

Adjust the test support (11) and the screws (12) to ensure the operation of the microswitch 3 0.5 mm before

the ‘Test’ position in the direction of the withdrawal (eliminate the play by pushing the rails).

Microswitch in ‘Isolated’ position

Adjust the support (11) and the screws (12) to ensure operation of the microswitch 2 0.5 mm before the

‘Isolated’ position (eliminate the play by pushing the rails).

10.3.9 MICROSWITCH ON TRIP ROD

(Refer to Fig. 10-25)

Signal indication of tripping on overload and

short circuit.

Breaker in ‘Closed’ condition (overcurrent and

short circuit release type DN1/SR18G/ Sr21i &

SR71 latched-on). Orientation of microswitch is

as shown in sketch. For DN1 Release keep the

microswitch closed and adjust by deforming

the strip (36) in such a manner as to obtain a

dimension of 1mm between the strip (36) and

the spring pin (37).

For DN1/SR release, operation of the

microswitch must be checked by tripping the

breaker through release.

Fig.10-26a Fig.10-26c

Fig.10-26b

10.3.10 PROCEDURE TO BE FOLLOWED

FOR REMOVING THE FRONT FACIA OF A

BREAKER

For removing the front facia, follow the

steps mentioned below :

1. Remove the plug of the operating handle

using a screw driver.

(see Fig. 10-26a)

2. Get screw (1) fully unscrewed.

(see Fig. 10-26b)

3. Remove the operating handle.

4. Get the screws at the four corners of the

front facia unscrewed.

(Fig. 10-26c)

5. Remove the front facia from the breaker.

1

Plug

10-14

1 ± 01

Fig. 10-25

36

37

37

36

FRONT SIDE

FOR DN 1 RELEASE

FOR SR RELEASE

10.3.11

FITTING A

• The breaker and cradle are fitted with ‘rating error prevention’ feature. This prevents the mismatch of

breaker & cradle, as a breaker having rating other than that of the cradle cannot be fitted on the

telescopic rails of the cradle.

spring washers plain washers

• Ensure that the breaker is not sitting on the collars of the studs.

•

• Take the racking handle out from its storage location and insert it into the racking screw location.

• Before racking ensure that

- Key of the racking interlock (if provided) is pressed and turned anti-clockwise.

- Key of position lock (if provided) is turned clockwise.

- Pin of door interlock is pressed.

• Rotate the racking handle in clockwise direction until position indicator shows ‘SERVICE’ position.

Note: Alignment of breaker facia with cradle facia indicates breaker is in ‘SERVICE’ position.

RACK- OUT OPERATION:

• Take the racking handle out from its storage location and insert it into the racking screw location.

• Before racking out ensure that

- Key of the racking interlock (if provided) is pressed and turned anti-clockwise.

- Key of position lock (if provided) is turned clockwise.

- Pin of door interlock is pressed.

• Rotate the racking handle anti-clockwise until position indicator shows ‘ISOLATED’ position.

PROCEDURE FOR RACK-IN/RACK-OUT

• Place the breaker onto the rails and engage with M8 nuts, and the

on the telescopic rail studs.

BREAKER ON ITS CRADLE:

• Before fitting the breaker on its cradle, ensure that the breaker is in ‘OFF’ position.

• Ensure that the closing spring in case of electrically operated breakers is discharged. If it is in

charged condition, press the ‘CLOSE’ push button to discharge it and then press the “TRIP” push

button to bring the breaker in ‘OFF’ position.

• Rack the telescopic rails out to ‘isolated’ position if necessary & further pull them out to

‘Maintenance’ position.

•

RACK-IN OPERATION:

• Push the breaker in, until lug engages with spring loaded catches. This corresponds to ‘Isolated’

position.

Push the breaker in fully and then tighten the nuts on the two accessible studs.

Pull out the breaker so as to tighten the inner two nuts.

10-15

11. SPARE PARTS11.1 GENERAL

Replacement of the recommended spares is to be carried out satisfactorily in accordance with

the given instructions.

11-1

Description Cat Nos.

CTs for SR18/SR18G/SR21i

630 S1/G ST37495OOOO

800 C/H/S1/G SL01857OOOO




2000 C/H SL90565OOOO

2000 S1/G SL93210OOOO

2500 C/H/S1 SL90566OOOO

3200 D SL90567OOOO

3200 S1 SL90575OOOO

3200 H0/H1 SL01740OOOO

4000 C SL90568OOOO

4000 H0/H SL01739OOOO

5000 C SL00990OOOO

6300 C SL00991OOOO

CTs FOR DN1

400 G SL01521OOOO

630 S1/G SL01522OOOO

800 C/H/S1/G (400/500 Tap) SL00786OOOO

800 C/S1 (640/800 Tap) SL00787OOOO

800/1000 H& 1000 C/S1/G (800/1000 Tap) SL00788OOOO



2000 C/H (1000/1250 Tap) SL00791OOOO

2000 S1/G SL00993OOOO

2000 C/H (1600/2000 Tap) SL00792OOOO

2500 C/H/S1 (1600/2000 Tap) SL00793OOOO

3200 D (2000/2500/3200 Tap) ST21261OOOO

3200 S1 SL00794OOOO

3200 HO/H1 SL01707OOOO

4000 HO/H SL01706OOOO

4000 C SL90603OOOO

11-2

Moving Arcing Contact Arc-chute Fixed Arcing Contact


Arc-chute (440V)

Arc Chute 630-1250 G/S1 SL91934OOOO

Arc Chute 1600-2000 G, 800-1600 C/H, 1600/2000S1 SL90855OOOO

Arc Chute 2000 C/H, 2500 C/H/S1 SL90857OOOO

Arc Chute 3200 C/S1 SL91834OOOO

Arc Chute 3200 HO/H1, 4000 H0/H SL90855OOOO

Arc Chute 5000/6300 C SL91977OOOO

Arc Chute 3200 D/ 4000 C SL92044OOOO

Arc Chute Fixing Kit SL94648OOOO

Arc-chute (690V)

Arc Chute 690V 800-1600 C/H SL91181OOOO

Arc Chute 690V 2000/2500 C/H SL91183OOOO

Arc Chute 3200 HO/H1, 4000 H0/H SL91181OOOO

Arc Chute 690V 3200 D& 4000 C SL92314OOOO

Arc Chute Fixing Kit SL94648OOOO

Fixed Arcing Contact

400 E, 630-1250 G/S1 SL93890OOOO

800-1600 C, 1600-2000 G/S1 SL93891OOOO

800-1600 H, 2000 S1 SL93040OOOO

2000 C/2500 S1 SL90631OOOO

2500 C/H, 3200 S1 SL90631OOOO

3200 HO/H1, 4000 H0/H SL93040OOOO

3200 D, 4000 C SL90652OOOO

5000-6300 C SL90652OOOO

Moving Arcing Contact

400 E, 630-1250 G/S1 SL93892OOOO

800-1250 C, 1600 G/ C,S1/ 2000 G/S1 SL93892OOOO

800-1600 C/H, 25000 S1 SL93892OOOO

2000 C SL90629OOOO

2000 H, 2500 C/H SL90629OOOO

3200 S1 SL93892OOOO

3200 HO/H1, 4000 H0/H SL93892OOOO

3200 D, 4000 C SL90742OOOO

5000-6300 C SL90742OOOO

11-3

Cradle Terminal Assy. Cradle Terminal support

Safety Shutter


Cradle Terminal Assembly

800/1000 C& 630-1250 S1 SL91822OOOO

800-1600 H& 1250/1600 C& 1600/2000 S1 SL91823OOOO

2000 C SL91825OOOO

2000 H& 2500 C/H SL91826OOOO

3200 D SL92448OOOO

2500 S1 SL95212OOOO

3200 S1 SL91828OOOO

4000 C SL92668OOOO

3200 HO/H1, 4000 H0/H SL91947OOOO

5000/6300 C SL91971OOOO

Cradle Terminal support

800/1000 C& 630-1250 S1 SL50086OOOO

800-1600 H, 1250/1600 C, 1600/2000 S1 SL50178OOOO

2000 C SL50085OOOO

2500/3200 S1, 2000 H& 2500 C/H SL50128OOOO

3200 HO/H1, 4000 H0/H SL50178OOOO

3200 D& 4000 C SL50093OOOO

5000/6300 C SL61677OOOO

Safety Shutter

Shutter Assy. 800-1600 C/H, 630-2000 S1 SL91833OOOO

Shutter Assy. 2000-3200 C/H, 2500/3200 S1 SL92811OOOO

Shutter Assy. 3200 HO/H1, 4000 H0/H SL91833OOOO

Shutter Assy. 3000 D& 4000 C SL92985OOOO

Shutter Assy. 5000/6300 C SL91972OOOO

11-4

Jaw Contacts Assembly

Vertical Terminals


Jaw Contacts Assembly

Jaw contact Assy. 630 S1, 800 S1/C, 1000 S1/C & 1250 S1 SL92860OOOO

Jaw contact Assy. 800/1000 H, 1250 C/H & 1600 S1/C/H SL91816OOOO

Jaw contact Assy. 2000 S1 SL91816OOOO

Jaw contact Assy. 2000 C & 2500 S1 SL90881OOOO

Jaw contact Assy. 2000 H, 2500 C/H & 3200 S1/C SL91116OOOO

Jaw contact Assy. 3200 HO/H1, 4000 H0/H SL93200OOOO

Jaw contact Assy. 3200 D SL90883OOOO

Jaw contact Assy. 4000 C SL91118OOOO

Jaw contact Assy. 5000/6300 C SL91976OOOO

Vertical Terminals

Vertical Terminals 800/1000 C& 630-1250 S1 SL93281OOOO

Vertical Terminals 800-1600 H, 1250/1600 C& 1600/2000S1

SL93282OOOO

Vertical Terminals 2000 C SL93284OOOO

Vertical Terminals 2000 H/2500 C/H SL93285OOOO

Vertical Terminals 3200 HO/H1, 4000 H0/H SL93288OOOO

11-5

Pole Assembly


Pole Assembly Fix Breaker

Pole Assy. 400 G,630-1250 G/S1 SL95601OOOO

Pole Assy. 800/1000 C, 1600 G SL93881OOOO

Pole Assy. 1250/1600 C, 1600 S1, 2000G SL93882OOOO

Pole Assy. 2000 C SL93883OOOO


Pole Assy. 2000/2500 H ST30070OOOO

Pole Assembly Draw-out Breaker

Pole Assy. 630-1250 S1 SL94674OOOO

Pole Assy. 800/1000 C SL90797OOOO

Pole Assy. 800-1600 H SL93192OOOO

Pole Assy. 1250/1600 C& 1600 S1 SL93886OOOO

Pole Assy. 2000 S1 SL94660OOOO

Pole Assy. 2000 C& 2500 S1 SL90800OOOO


Pole Assy. 2000/2500 H ST30071OOOO

Pole Assy. 3200 S1 SL95213OOOO

Pole Assy. 3200 HO/H1, 4000 H0/H SL93470OOOO

Pole Assy. 5000/6300 C SL91961OOOO

Pole Assy. 3200 D SL92638OOOO

Poe Assy. 4000 C SL91176OOOO

Pole Connector

Pole connector : 400-2000G,630-3200S1, 800-3200C, 800-2500H

SL00345OOOO

Pole connector : 3200 HO/H1, 4000 H0/H SL00345OOOO

Pole connector : 3200D, 4000C, 5000/6300 C SL61222OOOO

11-6

Shunt Release

Closing Coil Closing Coil Kit Closing PreventorEarth-Fault Release

Under-voltage Release

Description Cat No

Auxiliary Contact Block

2NO+2NC 400-2000 G,630-3200 S1, 800-2500 C/H & 3200 HO/H1,4000 H0/H

SL92765OOOO

2NO+2NC 3200D, 4000-6300 C SL92766OOOO

6NO+6NC 630-3200 S1, 800-2500 C/H & 3200 HO/H1, 4000 H0/H SL92767OOOO

6NO+6NC 3200D, 4000-6300 C SL92768OOOO

Shunt-Release

Shunt Release EA 24V DC SL92718O4OO



Shunt Release EA1 110V SL92718OAOO

Shunt Release EA1 240V AC SL92718OBOO

Shunt Release EA1 415V AC SL92718ODOO

Under-voltage Release

Under-voltage Release 24V DC ST36877OOOO

Under-voltage Release 240V AC SL92720BOOO

Under-voltage Release 415V AC SL92720DOOO

Closing Coil

Closing Coil 24V DC ST15954OOOO

Closing Coil 30V DC ST17210OOOO

Closing Coil 110V AC/DC SL91079OOOO

Closing Coil 240V AC/ 220V DC SL91080OOOO

Closing Coil Kit

Closing Coil Kit 24V DC SL94645OOOO




Resister Kit

Resistor-Kit 24VDC ST24202OOOO

Resistor-Kit 30VDC ST17402OOOO

Resistor-Kit 110VDC XE52076OOOO

Resistor-Kit 220VDC XE52071OOOO

Closing Preventer

Closing Preventer 240V AC SL91956OOOO

Closing Preventer 415V AC SL91955OOOO

Earth fault release for DN1

Type EF1 (10%, 20% In ) SL91340OOOO

Type EF2 (30%, 40%, 50% In) SL91341OOOO

11-7

Description Cat No

Insulating-Tube

Insulating-Tube Big 3-Pole

800-1600 C/H & 630-2000 S1, 400-2000 G SL10057OOOO

2000/2500 C/H & 2500/3200 S1, 3200C SL10059OOOO

3200 HO/H1, 4000 H0/H SL10061OOOO

3200 D, 4000 C SL10071OOOO

5000/6300 C SL11503OOOO

Insulating-Tube Big 4-Pole

800-1600 C/H & 630-2000 S1 SL10058OOOO

2000/2500 C/H & 2500/3200 S1, 3200C SL10061OOOO

3200 HO/H1, 4000 H0/H SL11503OOOO

3200 D, 4000 C SL11503OOOO

5000/6300 C SL11506OOOO

Insulating-Tube Small 3-Pole

800-1600 C/H & 630-2000 S1, 400-2000 G SL10062OOOO

2000/2500 C/H & 2500/3200 S1, 3200C SL10064OOOO

3200 HO/H1, 4000 H0/H SL10066OOOO

Insulating-Tube Small 4-Pole

800-1600 C/H & 630-2000 S1 SL10063OOOO

2000/2500 C/H & 2500/3200 S1, 3200C SL10066OOOO

3200 HO/H1, 4000 H0/H SL10509OOOO

Insulating-Hylum Tube Pillar (CT TUBES)

800-1600 C/H & 630-2000 S1, 400-2000 G (3P) SL10067OOOO

800-1600 C/H & 630-2000 S1 (4P) SL10067OOOO

2000/2500 C/H & 2500/3200 S1 (3P) SL10070OOOO

2000/2500 C/H & 2500/3200 S1 (4P) SL10070OOOO

3200 HO/H1, 4000 H0/H (3P) SL10067OOOO

3200 HO/H1, 4000 H0/H (4P) SL10067OOOO

Front Facia Top Cover

800-1600 C/H , 630-2000 S1 & 400-2000 G (3P) SL50202OOOO

800-1600 C/H & 630-2000 S1 (4P) SL50203OOOO

2000/2500 C/H & 2500/3200 S1 (3P) SL50204OOOO

2000/2500 C/H, 2500/3200 S1 (4P) &3200 HO/H1, 4000 H0/H (3P)

SL50206OOOO

3200 D, 4000 C (3P) SL50215OOOO

3200 D, 4000 C (4P) & 5000/6300 C (3P) & 3200HO/H1, 4000HO/H (4P) SL50247OOOO

5000/6300 C (4P) SL50262OOOO

11-8

Main Spring Motor FRCD

Description Cat No

Front Facia Side Cover

800-1600 C/H & 630-2000 S1 (4P) SL50197OOOO

2000/2500 C/H & 2500/3200 S1 (3P) SL50198OOOO

2000/2500 C/H & 2500/3200 S1 (4P) &3200 HO/H1, 4000 H0/H (3P)

SL50200OOOO

3200 D, 4000 C (3P) SL50201OOOO

3200 D, 4000 C (4P) & 5000/6300 C (3P) SL50248OOOO

5000/6300 C (4P) SL50263OOOO

Facia assembly

Front Facia Fixing Kit SL94649OOOO

Front Facia - for Manual ACB SL93201OOOO

Front Facia- for Electrical ACB SL93202OOOO

Cradle Facia SL95260OOOO

Motor

Motor 240V AC SL00315OOOO

Motor 110V DC SL00346OOOO

Motor 220V DC SL00347OOOO

Motor Limit Switch SL92795OOOO

Hardware it for Motor SL93076OOOO

Main Spring

MAIN SPRING 800-1600 C (3P),630-1600 S1 (3P) (Green) SL90686OOOO

MAIN SPRING 800-1600 C (4P), 2000-2500 C (3P), 800-1600H,2000-3200 S1 (3P), 630-1600 S1 (4P) (Blue)

SL90687OOOO

MAIN SPRING 2000/2500 H (4P), 3200 D& 4000 C (3P) (Yellow) SL92735OOOO

MAIN SPRING 5000/6300 C (3P), 3200 D& 4000 C (4P) (Grey) SL93953OOOO

MAIN SPRING 2000/2500 H (3P), 2000-3200 C (4P), 2000-3200 S1(4P), 800-1600 H (4P) (White)

SL91938OOOO

MAIN SPRING 3200/4000 H0/H/H1 (3P) (Violet) SL93797OOOO

MAIN SPRING 3200/4000 H0/H/H1(4P) (Light Green) SL93266OOOO

MAIN SPRING 5000/6300 C (4P) (Orange) SL93100OOOO

FRCD

FRCD 630-3200S1 (3P & 4P), 800-3200C (3P & 4P), 800-2500H (3P& 4P), 3200HO/H1 (3P), 4000HO/H (3P)

SL90825OOOO

FRCD 3200HO/H1 (4P), 4000HO/H (4P), 4000-630 C (3P & 4P) SL92642OOOO

11-9

Description Cat No

Mechanical operation counter

Mechanical operation counter XM81063OOOO

Mounting kit for counter for C2 (630-3200 S1, 800-3200 C, 800-2500 H, 3200 HO/H1, 4000 HO/H

SL93077OOOO

Mounting kit for counter for C3 3200D, 4000 C, 5000C, 6300C SL94556OOOO

MDO to EDO Conversion kit

MDO to EDO 630-3200 S1, 800-2500C/H (3P &4P), 3200 HO/H1,4000 HO/H (3P)

ST31583OOOA

MDO to EDO 3200 HO/H1, 4000 HO/H (4P) ST31583OOOB

MDO to EDO 3200D, 4000/5000/6300 C (3P & 4P) ST31583OOOC

Twisted Link Kit - MF/MDO SL94642OOOO

FRCD Roller Kit SL94647OOOO

Lockable Trip-push Button

Lockable Trip-push Button Type-AA SL93148OOOA

Lockable Trip-push Button Type-BB SL93148OOOB

Lockable Trip-push Button Type-CC SL93148OOOC

Lockable Trip-push Button Type-DD SL93148OOOD

Locking-in Isolated Position (LIP) Type-A SL93146OOOA

Locking-in Isolated Position (LIP) Type-B SL93146OOOB

Locking-in Isolated Position (LIP) Type-C SL93146OOOC

Locking-in Isolated Position (LIP) Type-D SL93146OOOD

Locking-in Any Position (LAP) Type-A SL93147OOOA

Locking-in Any Position (LAP) Type-B SL93147OOOB

Locking-in Any Position (LAP) Type-C SL93147OOOC

Locking-in Any Position (LAP) Type-D SL93147OOOD

Racking-interlock Type- AA SL93149OOOA

Racking-interlock Type-BB SL93149OOOB

Racking-interlock Type-CC SL93149OOOC

Racking-interlock Type-DD SL93149OOOD

Door Interlock SL93150OOOO

LTPB 3 I/C +2 B/C SL91936OOOO

LTPB 5 I/C +4 B/C ST30051OOOO

LTPB 4 I/C +3 B/C ST30052OOOO

LTPB 3 I/C +2 B/C (Type-L) SL01526OOOO

LTPB 3 I/C +2 B/C (TYPE-M) SL01527OOOO

LTPB 3 I/C +2 B/C (TYPE-N) SL01528OOOO

LTPB 3 I/C +2 B/C (TYPE-LM) SL01529OOOO

LTPB 3 I/C +2 B/C (TYPE-MN) SL01530OOOO

11-10

Description Cat No

Spring Kit SL92893OOOO

Roller Assy. SL90739OOOO

Hardware Kit SL91093OOOO

CONV. KIT AUTO-MANUAL - C2 SL92716OOOO

PUSH BUTTON-RED SL92635OOOO

PUSH BUTTON-GREEN SL92636OOOO

Racking Handle (upto 2500 H& 3200 C/S1) SL93151OOOO

Racking handle (3200 H0 & Above) SL93251OOOO

Operating Handle SL91623OOOO

Control Box (DVB) SL71256OOOO

R.O.H. MANUAL 800-2500A (DVB) SL60631OOOO

R.O.H. MANUAL 400A (DVB) SL60632OOOO

GRIP FOR Operating Handle SL50055OOOO

6 way Secondary isolating contact SL92701OOOO

Microswitch for voltmetric releases each SL92703OOOO

Microswitch for common indication of O/L & S/C (3) each SL92704OOOO

Microswitch for separate indication of O/L & S/C (3) each SL92705OOOO

Service position microswitch - Right SL93142OOOO

Service position microswitch - Left SL93143OOOO

Test or isolated position microswitch - Right SL93144OOOO

Test or isolated position microswitch - Left SL93145OOOO

Telescopic Rail (L) SL90773OOOO

Telescopic Rail (R) SL90774OOOO

6 WAY SIC BLK. SL92701OOOO

Trip-rod Assy. EA / MV SL92626OOOO

Trip-latch SL90715OOOO

Bezel FIXED BREAKER SL91601OOOO

Bezel DRAWOUT BREAKER SL91602OOOO

Main shaft assembly, 5000/6300 C4- Pole SL93252OOOO

Racking HandlePush Button

REPLACEMENT OF SPARES

11.2 REPLACEMENT OF SPARES COMMON FOR ALL ACBs

NOTE: Refer to section 10 for adjustment and inspection.

11.2.1. THERMOMAGNETIC TYPE: DN1

Remove the front facia (refer clause 10.3.10).

Refer to Fig. 11-1. In ‘Open’ condition of the breaker,

disconnect the wires from terminals (1) & (5) – as applicable –

and disconnect connecting piece (6) from Trip rod (3) by

removing pin (7). Remove screws (8). Remove the release and

disconnect connecting piece (6) from it. To refit, proceed in

reverse order. Grease the connecting pins. Make the connections

as per the wiring diagram given on the cover of the

release ( as shown in Fig. 11-1).

11.2.2 MICRO PROCESSOR BASED OVERCURRENT

RELEASE TYPE : SR Release

Remove the front facia (refer clause 10.3.10).

Remove the top cover. Refer the Fig. 11-2. Disconnect

the 9-pin female connector(s) (1) by pressing the top and bottom

flanges (2) and pulling the connector(s) (1) away from the release.

Remove screw (3) (fixing the bracket to the release). Remove three

nos. of screw (4). Remove the release. To refit, proceed in reverse

order (as shown in Fig. 11-2).

VOLTMETRIC RELEASES

Refer to Fig 11-3.

In ‘Open’ condition of the breaker. Disconnect the wires from

terminals (11). Disconnect the rod (15) from trip rod (13) by

removing pin (16). Unscrew nuts (12). Remove the support and

release assembly, loosen the screws (17), remove the release from

its support and disconnecting rod (15) (as shown in Fig. 11-3).

To refit proceed in reverse order. Grease the connecting pins.

11.2.3

1

16

1

4

13

15

Fig. 11-1

8

Fig. 11-2

Fig. 11-3

5

3

17

14

2

11

6

12

3

7

BRACKET

11-11

11.2.4 AUXILIARY CONTACT BLOCK

(For both 2N/O + 2N/C & 6N/O + 6N/C)

Disconnect the connections.

Loosen the screws and remove the auxiliary contact block.

To refit, proceed in reverse order, make sure rotary switch

link is placed properly.

Make the connections as per the wiring diagram shown in

Section 13 and the ferrules attached .(as shown in Fig. 11-4)

11.2.5 MOVING SECONDARY ISOLATING CONTACT BLOCK:

Disconnect the wires.

Remove the fixing screw of the SIC block

To refit proceed in reverse order.

Make the connections as per the wiring diagram shown in Section 13.

11.2.6 FIXED SECONDARY ISOLATING CONTACT BLOCK

Remove wire cover by unscrewing screws (1).

Disconnect the wires.

To refit, proceed in reverse order.

Make the connections as per the wiring diagram shown in Section 13.

11.3 REPLACEMENT OF SPARES FOR 400-2000E, 400-2000G,

3200H0/H1 & 4000 H0/H800-2500H, 800-3200C, 630- 3200 S1, 1600D,

NOTE: Spare kits accompany detailed instructions on HOW TO

CONNECT & TEST a particular accessory.

11.3.1 ARC CHUTE

Press latching lever (1) and rotate it.

Remove the arc chute by pulling it upwards.

To refit, place the arc chute over the arcing horns (2) and rotate the latch

for locking. (as shown in Fig. 11-7)

11-12

Fig. 11-4

Fig. 11-6

Fig. 11-7

1

2

2

1

(as shown in Fig. 11-5).

Fig. 11-5

(as shown in Fig. 11-6).

11.3.2

11.3.2.1

ARCING CONTACTS

11.3.2.1 FIXED A RCING CONTACTS

Replacement of fixed arcing contacts is to be done in ‘Open’

condition of the breaker.

Loosen the screws (1) and slide the arcing contacts forward.

To refit, proceed in reverse order. (as shown in Fig. 11-8)

M OVING A RCING CONTACTS :

Replacement of moving arcing contacts is to be done in

‘Closed’ condition of the breaker.

Loosen the screws (2) by about 1.5 mm to disengage locating

boss (E) and then pull upwards.

11-13

Plain Surface

Small Step

3200D

Big step

Plain Surface

4000C/5000C/6300C

Small Step

4000C/5000C/6300C

Big step

Small Step

Small Step

3200D

For Upper Terminals

For Lower Terminals

Fig. 9-9

11.4 REPLACEMENT OF SPARES FOR C3 & C4 D/O ACB’s

11.4.1 JAW CONTACTS

Ensure orientation of steps while mounting jaw contacts on

upper and lower terminals of breaker as shown in Fig. 9-9

Fig. 11-8

1

2 E

To refit, proceed in reverse order .(as shown in Fig. 11-8)

Note: Spare kits accompany detailed instructions on how to connect & test a particular accessory.

12-1

Rating Type

400A -1250A

1600A

X

5

10

Y

150

145

Note : All Dimensions are in mm.

40 min 40 min+1.0316

56 30102 102 56

32

5

28

5

20

22 137.5

179.5

32 20

4 HOLES

Ø12

38

5

X

X

Y

22

7

20 min

23.5

340 min

Insulator

10

0 m

in

216

298

402 21

12.1.1 For CN-CS...E 400A-2000A 3P

12.1 DIMENSIONAL DETAILS FOR FIXED BREAKERS

400A - 2000 A

Terminal Connections

2 Holes-ø13

30 15

12.525

50

12. OVERALL DIMENSIONS

2000A 15 140


12.1.2 For CN-CS...G 400A-2000A 3P

Note : All Dimensions are in mm. 12-2

for Metallic Components

To RemoveArc Chute

DoorBezel2

00

min

10

0 m

in

9

340 min

20 min

for Insulating Sheet

14

0 m

in

7

27

38

5

33

22

30 35

20 301

4052.6 min

86

27

54

10

68

.82

56

Earthing Terminal

2 Holes 6.3-Ø

1)

(2

10

4

30

9

39

4

36 min

26

326 36 min

26458 26

Terminal for 400/630/800G1000/1250G

5

5

23.5

22

7

15

0

Terminal for 1600G

10

1023.5

22

7

14

5

2020

216

4 Hole- Ø12for Mounting

Terminal for 2000G

15

1523.5

22

7

14

0

400A - 2000 A


2 Holes-ø13

30 15

12.525

50

56 102 102 56


12.1.3 For 630A to 1600A 3P/4P S1, 800 to 1600A 3P/4P C/H, 2000A to 2500A 3P C/H & 3200A 3P C

400A - 2000 A



12-3


To RemoveArc Chute

DoorBezel2

00

min

10

0 m

in

9

340 min

20 min


14

0 m

in

7

27

38

5

33

22

30 35

20230

301

4052.6 min

86

27

54

10

68

.82

56

Earthing Terminal

2 Holes 6.3-Ø

2 Holes-ø13

30 15

12.5

25

50

1)

(2

16

10

4

30

9

39

4 16

36 min

26

A 36 min

26458 26

DD E F E

2020

216

4 Hole- Ø12for Mounting

* Special Version (3200C x 3P/4P)made for Export Only

2000-2500 C/H & 3200 C

3 Holes-ø13

100

25

30

25 25

15

25

RatingsCN-CS

Dimensions(mm)

A D E F

630/800/1000/1250/1600A

S1 3P

800/1000/1250/1600A C/H 3P

S1 4P

C/H 4P

2000/2500A C/H 3P

326 57 102

414

482

56

83

98

154

98

-

-630/800/1000/1250/1600A

800/1000/1250/1600A

3200A C 3P*

*

Terminal for 800 C 1000 S1/C &1250 S1

10

10

23.5

22

7

14

5

Terminal for 1600 S1 & 800/1000 H 2000/2500 C/H & 1250/1600/ 3200 C

15

1523.5

22

7

14

0

Terminal for 630/800 S1

8

8

23.5

22

7

14

7

DIMENSIONAL DETAILS FOR FIXED BREAKERS

12.1.4 For 2000A to 2500A 4P C/H & 3200A 4P C

RatingsCN-CS

Dimensions(mm)

A D E F

2000/2500A C/H 4P

3200A C 4P628 82 150 156



12-4

Terminal for

2000-2500 C/H & 3200 C


to RemoveArc Chute

DoorBezel2

00

min

10

0 m

in

9

340 min

20 min


14

0 m

in

7

27

38

5

33

22

30 35

20

230

301

4052.6 min

86

27

54

10

68

.82

56

Earthing Terminal

2 Holes 6.3-Ø

(1

)2

16

01

4

30

9

39

4 16

36 min

26

A 36 min

26458 26

DD E F E

15

1523.5

22

7

14

0

4 Holes- Ø10for Mounting

2000-2500 C/H & 3200 C


*

3 Holes-ø13

100

25

30

25 25

15

25

DIMENSIONAL DETAILS FOR FIXED BREAKERS

12.1.5 For 3200D/4000C 3P/4P

Terminal for 3200D / 4000C


For 3200D/4000C

Bezel Fixing Plan for all Fixed Breakers

Note : A = 89 for 4000C/3200DA = 91 for other fixed ACBs

Door CutoutDoor Drilling for

Bezel Fixing Plan

Bezel

12-5Note : All Dimensions are in mm.

28

RatingsCN-CS

Dimensions (mm)

A B D E F

3200D/4000A C 3P

3200D/4000A C 4P

628 636 112 202 -

830 838 112 202 202

B

2645826

50

9

39

43

09

21

16

D E E

A

F D

4

26

36 min

26

4

36 min

4 Holes-ø12 for Mounting

15

15

28

7

17

3.5

71

444

20230

140

2.6min

85 10

54

68

.82

56

27

Earthing Terminal

2 Holes-ø6.35

03 25

71

10

0m

in

20

0m

in

14

0m

in

7DoorBezel

to RemoveArc Chute


356minfor Insulating Sheet16min

16

10

2

16

27

33

22

6 Holes-Ø14

30

15

160

507

9

Hinge

A

11 min 59 294 15 min

32

5

12 Holes-Ø4

112

112

112

305

101

5.5

36

3

332

50

Hinge

27

Rear View

12.2 DIMENSIONAL DETAILS FOR DRAW-OUT BREAKERS

12-6

12.2.1 For 800A to 2500A C/H, 3200C, 3200A H0/H1, 4000A H0/H, 630A to 3200A S1 3P/4P

Terminal for 3200 S1/C

25

65

Terminal for1250/1600/2500C/H& 800/1000/2000H,

5

40

15

30

8.5

22

1.5

22

1.53

08

.5

Terminal for3200H0/H1 & 4000H0/H

15

15

22

1.53

08

.5

60


Dimensions (mm)RatingsCN - CS

630/800/1000/1250/1600/2000A

630/800/1000/1250/1600A

2500/3200A

2000/2500/3200A

2000/2500/3200A

2500/2500A

3200A

4000A

3200A

4000A

3P

3P

4P

4P

3P

3P

4P

4P

3P

3P

4P

4P

A

399

487

D

97.5

96.5

E

102

98

F

-

98

S1

C/H

S1

C

C

H

H0/H1

H0/H

H0/H1

H0/H

555

701

701

909

123.5

122.5

148.5

151.5

154

150

202

202

-

156

-

202

A

122

26494.5

40

4

6

199.5

46

8

D E F E D

64.5

Earthing Terminal


for Insulating Sheet380 min

40 max

64.53

97

.5

46M 10

4

6538

10

0 m

in

DoorBezel

Service Position

51 Test Position

75 Isolated Position

17.5 min.

18.9 max.

8.9 min.

18 245

20

7428 1

60

26

20

0 m

in

7

(10) 54

68

.82

56

continued....

Terminal for630/800/1000/1250 S1& 800/1000C, 2000C,

5

40

10

30

8.5

22

1.5

2500S1

630/800/1000/1250/1600/2000A

630/800/1000/1250/1600A

S1

C/H

2000/2500A 3PH

2500/3200A 3PS1

*

*


1600/2000S1

DIMENSIONAL DETAILS FOR DRAW-OUT BREAKERS

Flat Terminal Connections

800 - 1000C & 630-1250S1 2000C

2000H & 2500C/H 2500S1

106

20

3333

43

67

12

6 Holes- 14Ø

20

106

3333

43

67

12

6 Holes 14-Ø3

81

2

62

12.5

4 Slots

8.5 x 9.5

25

10.2

38

58

.4

8.5

50

6 Holes 14-Ø

160

25 25 25 25 25

17.5

25

507

0

12

.5

19

63

4 Slots

8.5 x 9.5

25

10.2

38

58

.4

8.5

800 - 1000H, 1250/1600C/H

6 Slots

8.5 x 9.5

100

30

38

58

.4

10.2

8.5

30

20

3200C/S1 3200H0/H1 & 4000H0/H

106

6 Holes-Ø14

20

3333

& 1600-2000S1

12-7

1


Note : All Dimensions are in mm. 12-8

RatingsCN-CS A D E

3200D/4000C 3P

3200D/4000C 4P

5000C/6300C 3P

5000C/6300C 4P

711 155.5 200

913 156.5 200

913

269

187.5

187.5

269

12.2.2 For 3200D/4000C 3P/4P, 5000C/6300C 3P/4PA

124

96.5 264

6

199.5

40

4

D E E E D

58

3

42

64.5 Earthing Terminal

Terminal Connections5000C/6300C

Dimensions (mm)

1182

28

17.5

40 50 40 43.5

63

217

8 Holes-Ø14



40max

102

10

0m

in

20

0m

in

Isolated Position

Test Position

Service Position

26

46

73

68

25

6

M 1

0

105

5

615

17.5min

18.9max

245

8.9min

18

20 2

8

(74

) 16

0

400min75

51

FRONT VIEW

REAR VIEW

SIDE VIEW

6 Holes 14-Ø

160

25 25 25 25 2517.5

25

50

12

.5

Terminal Connections 4000C

Terminal for 4000A C

54

25

6

35

6

Terminal for5000/6300A C

15

25

6

36

8

67

160

20

6060

46

70

12

6 Holes- 14Ø

Terminal Connections 3200D

DoorBezel

10 54

68

.82

56

7

15

28

5

Terminal for 3200D


12.2.3 Mounting Details :- For Horizontal Mounting of all Draw-out Breakers

12-9

12.2.4 Bezel Fixing Plan for all Draw-out Breakers

For 3200D/4000C/5000C/6300C 3P/4P

25

50

108.5

184.5

25

592

552

Door Cutout

Hinge

A20.5 min 294 5 min

Hinge

Base ofCradle

1

41

2

5.5

6 Holes- 4Ø

19

92

24

305 332

45

0

37

24

Front

Front

48120

64

.1*G

107.5 367.5 40

24

10 Holes-Ø11 for Mounting

For 3P/4P 630A to 2500C/H/S1, 3200C/S1/H0/H1, 4000H0/H

800A - 1600A

630A - 2000A

800A - 1600A

630A - 2000A

2000 / 2500A

2000 / 2500A

2500 / 3200A

2500 / 3200A

3200A

3200A

4000A

4000A

3P

3P

4P

4P

3P

4P

3P

4P

3P

4P

3P

4P

C/H

S1

C/H

S1

C/H

C/H

S1

S1

H0 / H1

H0 / H1

H0 / H

H0 / H

280.3

280.3

368.3

368.3

436.3

582.3

436.3

582.3

582.3

790.3

582.3

790.3

RatingsG

(mm)Type

Door Drillingfor Bezel Fixing Plan

Bezel

Note : All Dimensions are in mmNote :For 3200A D 3P/4P, 4000A C 3P/4P, 5000C/6300C 3P/4P ACB, A=81.5 For other Drawout Breakers A=79.5

10 Holes-Ø11 for Mounting

A

RatingsCN-CS

A

3200D/4000C 3P

3200D/4000C 4P

5000C/6300C 3P

5000C/6300C 4P

711

913

913

Dimensions

1182


12-10

12.2.6 Door Interlock fixing for Plan for all Draw-out Breakers

Note : All Dimensions are in mm

HOLES 8.5Ø

HOLES 12.5Ø

DOOR

BRACKET TO BE WELDED TO THEDOOR FROM INSIDE AFTER ALIGNING THE Ø12.5 HOLE OF THEBRACKET TO THAT OF THE DOOR.

10.5

111

.41

5

CRADLE

12.2.7 OTHER TERMINAL ORIENTATIONS FOR DRAW-OUT ACBs

12.2.7.1 Horizontal Terminals

800 - 1000C 1250 - 1600C/H& 800/1000H

2000C 2500C/H& 2000H

80 80 80

1510

10

15

30

8.5

22

1.5

80

Rear Side

25

25

25

12.5 25

10

0

12

.5

4 Holes 14-Ø 6 Holes 14-Ø

20

16

0 33

33

12 43

12.5

12

.5

50

25

25

2 Holes- 14Ø

63

3 Holes 14-Ø

15

16

.5

12.5 30

16

.5

12.2.7 OTHER TERMINAL ORIENTATIONS FOR DRAW-OUT ACBs

12-11Note : 1) All Dimensions are in mm. 2) Consult us for other Terminal Orientations.

Side View Rear View

V

U

O P4 Holes T-Ø

NM

40.0

R

38

7.5 X

22

1.5

30

8.5

S W

Ratings M N P Q R S T U V W X

630-1250 S1 & 800-1000 C

1600-2000 S1 & 1250-1600 C/H

800-1000 H

2000 C

2500 S1/C/H

3200 S1

10.2

20

20

20

38

40

40

40

20

20

20

20

25

25

40

40

29.2

29.2

29.2

33.5

5

5

22.5

7.5

9

9

14

14

65

65

80

80

95

95

110

110

10

10

15

15

58.4

80

80

80

Top

12.2.7.2 Vertical Terminals

12.2.7.3 Vertical Terminals 3200 HO/H1, 4000 HO/H

V S W

U 60.0

Q P6 HOLES - ØT Top

RNN

M

38

7.5 X

30

8.5

22

1.5

Side View Rear View

Ratings M N P Q S T U V W XR

3200 HO/H1, 4000A HO/H 30 50 45 40 29.5 95 14 80 140 15 160

2000 H

30 60 20 40 33.5 7.5 14 105 100 15 120

12.3 REPRESENTATIVE TERMINATION ARRANGEMENT

12.3.1 For 3-Pole breaker

12-12

First Fixed Support

Fixed Support

10

0 m

m M

in

12-13

REPRESENTATIVE TERMINATION ARRANGEMENT

12.3.2 For 4-Pole breaker

Note : In 4-Pole ACBs, neutral pole is fully rated.Hence the poles at either extreme can be used as the neutral.

Note : Factory gives NRYB configuration whenviewed from the front of the ACB as standard.

10

0 m

m M

in

First Fixed Support

Fixed Support

12-14

12.4 External Neutral CT

For earth fault protection and protection of neutral against overload, neutral CT is required.For 4- pole breakers, the CT is provided inside the breaker, whereas for 3 pole breakers,external CT is required to be provided.

It important that with C-POWER breaker, special neutral Cts supplied by L&T are used.

W1

H1

H2

W2

D1

Note : All Dimensions are in mm

W1 H1 W2 H2 D1

400 E/G, 630 S1/E/G 52 11 94 94 40

800 C/S1/H/E/G 52 16 94 99 40

1000 C/S1/H/E/G 52 16 94 99 40

1250 C/S1/H/E/G 52 16 94 99 40

1600 C/S1/H/E/G 52 16 94 99 40

2000 S1/E/G 52 16 94 99 40

2000 C/H 102 16 146 99 40

2500 C/S1/H 102 16 146 99 40

3200 C/S1 102 16 146 99 40

3200 HO/H1 150 16 190 99 40

4000 HO/H 150 16 190 99 40

3200 D, 4000 C 144 25 192 110 40

5000 C 220 25 259 110 45

6300 C 220 25 259 110 45

Breaker rating

CT Dimensions

Window (min) External (max)

12-15

12.5 GOOD TERMINATION PRACTICES

The following points will help make a good electrical joint having low contact resistance and hence lower

temperature rise :

1. Inspection of links:

?Bending of the links, if any, and position of the termination holes should be such that the mating surfaces

shall meet in a plane.

?Bending radius should be at least equal to 2 times the thickness of the busbar.

2. Preparing the link:

?Ensure that the holes are free from burrs.

?Aluminium to aluminium joint-

?Clean the contact surfaces (just prior to the joining) with a wire brush to obtain a bright finish.

?Remove metal particles from surfaces and edges with a clean cloth.

?Apply a thin film of contact grease (neutral petroleum jelly) immediately to avoid oxidation.

?Aluminium to copper joint-

This is applicable to joint between ACB terminals and links.

?Clean the ACB terminals with cloth only.

?If silver plated aluminium is used then clean the area of the joint with cloth only.

?If bare aluminium is used then clean the contact surfaces (just prior to the joining) with a wire brush to

obtain a bright finish. Remove metal particles from surfaces and edges with a clean cloth and apply a

thin film of contact grease (neutral petroleum jelly) immediately to avoid oxidation

3. Sleeve or tape should not be sandwiched in the intended area of contact.

4. When joining busbars, the overlap of the busbars should be equal to the width of the busbar.

5. Use right size (correct length and diameter) of bolts with plain and conical spring (Belleville) washers.

If aluminium hardware is used then only plain washers can be used.

6. Recommended tightening torque for aluminium joints is as follows,

Tightening should be done using a torque wrench or equivalent tool. Do not over-tighten the joint.

7. After termination a minimum gap equal to the thickness the busbars is to be maintained during the

subsequent run.

8. Supports:

?Should provide minimum 2 supports in order to prevent the weight of links on ACB terminals:st

?1 support < 100mm

?Other supports should be provided at regular intervals so that stresses induced during short circuit do

not exceed the elastic limit of the link material.

9. Corrosive atmosphere:

?Corrosive atmosphere has a profound effect on connections. Nonconductive layers are formed on the

connecting surface which heats up the joint and deteriorates the performance. Frequent maintenance of

the joints / connections is required in such cases. Monitoring the joint temperatures with non-contact

thermometers is also useful.

Bolt Size

M8

M10

M12

M16

Standard

0.85

1.88

3.2

7.3

High-tensile

2.5

4.7

7.8

18.0

Torque (kgf-m)

13. WIRING DIAGRAMS

13-1

13

14

15

16

17

18

19

20

21

22

23

24 1

2

3

4

5

6

7

8

9

10

11

12

CA1

CA2

CA3 CA4

CA5

CA6

CA3 CA4

CA2CA5

CA1 CA6

BR

EA

KE

R A

UX

ILIA

RY

CO

NTA

CT

S

13.1 WIRING DIAGRAM FOR C-POWER ACBs

For SR 21i release (P&C unit)

SI, SO

GI, GO

G

I discrimination

I discrimination

Short ckt i/p & o/p

Ground fault i/p & o/p

Ground

The above drawing is for EDO breakers.

1) For MDO/MF versions

Ref no. 3, 10, 11 are not applicable

E, B, C, D, A are applicable only in electrical breakers.

2) For EF versions

The ref. no. 12,13, 14, 15, 16, 17, 18, 19, 20 are provided

as per customer requirement.

FCA Limit switch(Shown in breaker reset condition)

R Economy Resistor

C11 Limit switch operates when closing electromagnet is held on

C6 ‘Service’ position microswitch for withdrawable circuit breakers (shown in ‘test’ position)

*

* CA1,N.O. Contacts 3 & 4 not available for auxiliary use,

if shunt release type EA/EA1 is used.

@ SIC-A

Programmed to com plete the circuit only in ‘Test’

position. This enables carrying out operations of

breakers by bypassing the electrical interlocks

which are active in ‘Service’ position.

TEST SERVICE

#

Protection &

Control Unit

1

Aux

NC

2

Shunt

Release

3

Aux

NC

4

Aux

NO

5

Aux

NC

6

Aux

NO

7

Aux

NC

8

Aux

NO

9

Neutral

C.T.

12

U/V

Release

13

Closing

Preventer

14

Spring

Charging

Indication

15

Common

fault

Indication

16

Separate

fault

Indication

17

Shunt

trip

Indication

18

Under

voltage

Indication

19

Electrical

anti-pumping

20

Electric

Charging

Device

11

Closing

Coil

10

((

(

((

(

(

(

(

(

(

16 A

15

41

42

42

41

F 52 55

(

(E

(

(50

((

((

(

(

(

(

(1

(

(

82

81

NCT(

(

B

E

CC

14

13

12

11

10

9

862

75

MV CP

(

(

D

C

(

(

40

4

3

Inte

rna

l Wirin

gO

nly

fo

r D

C

Inte

rna

l Wirin

g

(

EA/

EA1

x

B

DN1/SR18/SR18G

SR21i/SR71

((

8182

As per order/requirement

CA

-1

C6

C11

R

73

( (

(

( (

(

7574

70

7271 B

Electrical anti-pumping

(

EC

D

F H

(

(H

Main

Circuit

Ref no.

Load

x x x

N R Y

@

# Available for manual ACBs as well .

NOTE : 1. Max 24 SICs available on ACB (For control,

accessories and auxiliary circuits)

2. For Electrical ACBs

A,B,C,D & E are used for internal breaker wiring.

Applicable only for AC control supply

3. For 4P breakers 81,82 are not available.

13.2 SIGNALLING

13.2.1 SPRING CHARGE INDICATION(FOR ELECTRICAL ACBs)

13.2.2 SIGNALLING FOR VOLTMETRIC RELEASES

13.2.2.1 SHUNT RELEASE

13.2.3 BREAKER ON-OFF INDICATION

13.2.2.2 UNDER VOLTAGE RELEASE

13.2.4 POSITION INDICATION 13.2.4.1 ISOLATED / TEST POSITION

13.2.4.2 SERVICE POSITION

13.2.4.3 SERVICE, TEST, ISOLATED POSITION

INDICATING LAMPS

L4-for Under Voltage Trip

L5-for ‘Shunt’ Trip

L6-for ‘Isolated’ and/or ‘Test Position’

L7-for ‘Service Position’

L8-for ‘Spring Discharged’

L9-for ‘Spring Charged’

L10-for ’Breaker On’

L11-for ‘Breaker Off’

L12-for ‘Test’ Position

B5, B6, B7, B8 - Contactors Electromagnets

BPED - ‘Signal Cancelling’ Push Button

SIGNALING SWITCHES

C3-for ‘Under Voltage’ Trip

C5-for ‘Shunt’ Trip

C6-for ‘Service’ Position (Left)

C7-for ‘Service’ Position (Right)

C8-for ‘Isolated/Test’ Position (Left)

C9-for ‘Isolated/Test’ Position (Right)

C12-for ‘Earth fault’ Trip

Note : Wiring shown inside dotted lines is internally wired in ACB

13-2

6 1L / 2 O8 CC R 9

L7 C6 RO 7C

L7

1L 2

L6

8 O 9C C R6 R C7C O

L10

L11

CAI

L8

L9

H

FCA

D

G

B7

L5BPED

70 65

73B8

74

L4BPED

72

63 70B5

71

M

13.2.5 SIGNALLING FOR OVERLOAD AND SHORT - CIRCUIT TRIPPING

13.2.5.1 Manual Reset

The cancelling of the fault signal is effected

by pressing the local trip button, which also

resets the overcurrent release.

13.2.5.2 Auto Reset

Cancelling of fault signalling is provided by

push button BPED. The presence of the fault

signal does not prevent closing of the circuit

breaker.

Common SignallingCommon Signalling

Separate Signalling

Signalling Switches

C1-for ‘Overload and Short Circuit’ Trip

C2-for ‘Short Circuit’ Trip

INDICATING LAMPS

L1-Common for ‘Overload and short Circuit’ Trip

L2-for ‘Overload’ Trip

L3-for ‘Short Circuit’ Trip

B1, B2, B3, B4 - Contactors

BPED - ‘Signal Cancelling’ Push button

–( O–– SIC terminals

Note : Wiring shown inside dotted lines is internally wired in ACB13-3

B2

52

L1

51

C1 50

BPED

L152

51

C1

50

L3

BPED L2

B355

C2

52

C1 50

51

B454

Separate Signalling

L2

L3

B1

55

C2

54

52

51

C1

13-4

Breaker Ratingin Amps.

Window Size for Neutral CT

AxB

630 / 800 /1000 C/S1

1250/1600 C/S1& 2000S1

2000C & 2500/3200 C/S1

4000C / 3200D

5000C / 6300C

11 x 52

16 x 52

16 x 102

25 x 144

25 x 220

SR21i CT CONNECTOR

N R Y B

81

S1 S1 S1 S1

S2 S2 S2S2

82

N R Y B

1 2

3 4

5 6

7 8

9 10

13.3.2 For Earth Fault Protection with SR21i / SR18G Release

Note: 1) Wining Diagram shown is for 3Pole

ACBs.

2) For 4 Pole ACBs, Neutral CT may

be mounted on Neutral Pole inside

the Breaker and therefore Terminal

No. 81 (& 82 for SR21i Release)

may not be required in such cases. A ±

1

B ± 1

13.3 WIRING DIAGRAM: 3Ø, 4 WIRE SCHEME (FIXED BREAKERS)

13.3.1 For Earth Fault Protection with DN & EF Release

A2A1

A3

C1S

A

BYRN

TR Phase1TY TB S

EFRELEASE

T1 M1 T2 M2 T1 M1 T2 M2 T1 M1 T2 M2 S

Phase2 Phase3

BYRN

Red Yellow Blue

81

DN RELEASE

Star Point

82

13-5

13.4 WIRING DIAGRAM: 3Ø, 4 WIRE SCHEME (DRAWOUT BREAKERS)

A2A1

A3

C1S

A

BYRN

TR Phase1TY TB S

EFRELEASE

T1 M1 T2 M2 T1 M1 T2 M2 T1 M1 T2 M2 S

Phase2 Phase3

BYRN

Red Yellow Blue

S1

S2 S2

S1

DNRELEASE

Star Point

4m

m²

- C

op

pe

r W

ire

For Earth Fault Protection with DN & EF Release

14. SPECIAL APPLICATIONS

14-1

14.1. 690V Application of C-POWER ACBs

C-Power breakers are also suitable for operation at 690V with following changes / precautions.

a)Arc chute suitable for 690V to be used.

b)Characteristics such as rated service Short circuit breaking capacity and rated ultimate short

circuit breaking capacity are as specified on label.

c) Only top terminals (marked line) of breaker are to be connected to the incoming side of supply.

The label indicating suitability of the breaker at 690V with special arc chutes is put on the facia of the

breaker.

The label indicating characteristics is put just below the nameplate on the side of the breaker.

The label identifying ‘Line’ terminal is put above the top terminal on the rear side of the breaker in fixed

ACBs and on the rear side of the cradle in draw out ACBs.

300913

REGISTERED OFFICE AND HEAD OFFICEL&T House, Ballard EstateP. O. Box 278Mumbai 400 001Tel: 022-6752 5656Fax: 022-6752 5858Website: www.Larsentoubro.com

ELECTRICAL STANDARD PRODUCTS (ESP)501, Sakar Complex I Opp. Gandhigram Rly. Station Ashram RoadAhmedabad 380 009Tel: 079-66304007-11Fax: 079-26580491 / 66304025e-mail: [email protected]

38, Cubbon Road, Post Box 5098Bangalore 560 001Tel: 080-25020100Fax: 080-25580525e-mail: [email protected]

131/1, Zone IIMaharana Pratap NagarBhopal 462 011Tel: 0755-4098706 / 7 / 8 / 9Fax: 0755-2769264e-mail: [email protected]

Plot No. 559, Annapurna ComplexLewis RoadBhubaneswar 751 014Tel: 0674-6451342, 2436696Fax: 0674-2537309e-mail: [email protected]

SCO 32, Sector 26-D Madhya Marg, P. O. Box 14Chandigarh 160 026Tel: 0172-4646841 to 7Fax: 0172-4646802e-mail: [email protected]

10, Club House RoadChennai 600 002Tel: 044-28462072 / 4 / 5 / 2109Fax: 044-28462102 / 3 e-mail: [email protected]

67, Appuswamy RoadPost Bag 7156 Opp. Nirmala CollegeCoimbatore 641 045Tel: 0422-2588120 / 1 / 5Fax: 0422-2588148e-mail: [email protected]

Product improvement is a continuous process. For the latest information and special applications, please contact any of our offices listed here.

Electrical Standard Products (ESP) Branch Offices:

L&T House, Group MIG - 5 PadmanabhpurDurg 491 001Tel: 0788-2213833 / 14 / 28 / 29Fax: 0788-2213820

A1/11, Astronauts Avenue Bidhan NagarDurgapur 713 212Tel: 0343-2536891 / 8952 / 7844Fax: 0343-2536493 e-mail: [email protected]

Milanpur Road, Bamuni MaidanGuwahati 781 021Tel: 0361-2651297Fax: 0361-2551308e-mail: [email protected]

II Floor, Vasantha Chambers5-10- 173, Fateh Maidan RoadHyderabad 500004Tel: 040-66720250Fax: 040-23296468e-mail: [email protected]

D-24, Prithvi Raj Road, C-SchemeJaipur 302 001Tel: 0141-2385916 / 8Fax: 0141-2373280e-mail: [email protected]

Akashdeep Plaza, 2nd Floor P. O. GolmuriJamshedpur 831 003JharkhandTel: 0657-2340864 / 387Fax: 0657-2341250e-mail: [email protected]

Skybright Bldg. M. G. RoadRavipuram Junction, ErnakulamKochi 682 016Tel: 0484-4409420 / 4 / 5 / 7Fax: 0484-4409426e-mail: [email protected]

3-B, Shakespeare SaraniKolkata 700 071Tel: 033-44002572 / 3 / 4 Fax: 033-22822589e-mail: [email protected]

A28,Indira Nagar, Faizabad Road Uttar Pradesh, Lucknow 226 016Tel: 0522-2312904 / 5 / 6Fax: 0522-2311671e-mail: [email protected]

No: 73, Karpaga Nagar, 8th StreetK. PudurMadurai 625007Tel: 0452-2537404, 2521068Fax: 0452-2537552e-mail: [email protected]

EBG North Wing Office - Level 2 Gate 7, Powai CampusMumbai 400 072Tel: 022-67052874 / 2737 / 1156Fax: 022-67051112e-mail: [email protected]

#12, Shivaji NagarNorth Ambazari RoadNagpur 440 010Tel: 0712-2260012 / 3Fax: 0712-2260020 / 30e-mail: [email protected]

32, Shivaji Marg P. O. Box 6223New Delhi 110 015Tel: 011-41419514 / 5 / 6Fax: 011-41419600e-mail: [email protected]

L&T House P. O. Box 119 191/1, Dhole Patil RoadPune 411 001Tel: 020-26135048Fax: 020-26124910, 26135048e-mail: [email protected]

3rd Floor Vishwakarma ChambersMajura Gate, Ring RoadSurat 395 002Tel: 0261-2473726Fax: 0261-2477078e-mail: [email protected]

Radhadaya ComplexOld Padra RoadNear Charotar SocietyVadodara 390 015Tel: 0265-2311744 / 6613610 / 1 / 2Fax: 0265-2336184e-mail: [email protected]

48-8-16, DwarakanagarVisakhapatnam 530 016Tel: 0891-6620411-2 / 3Fax: 0891-6620416e-mail: [email protected]

Electrical Standard ProductsLarsen & Toubro LimitedPowai Campus, Mumbai 400 072Customer Interaction Center (CIC)BSNL / MTNL (toll free) : 1800 233 5858Reliance (toll free) : 1800 200 5858Tel : 022 6774 5858Fax : 022 6774 5859E-mail : [email protected] : www.LNTEBG.com

CD00494 Rev A1_Final

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