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630 - 6300A220-415-690V AC / 250V DCIEC 60947-2 / IS 13947-2
TMTM
Controls & Switchgear Company Ltd.
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Controls & Switchgear Company Ltd.
Webs i t e : www.con t ro l s i nd i a . comWebs i t e :
International Business Division Tel. : +91-11-4161 3503, 3088 7520 - 29, Fax: +91-11-2683 8291, 2684 7342email : [email protected]
: : email :
DistributorDistributor
Section Contents PAGES
1. Introduction 4-7Salient features, internal & general appearance of Drawout ACB
2. Ratings & Specifications 8-11Free air & enclosed thermal current ratings for AC & DC applications & selectionof specifications
3. Multi-Function Protecion Devices 12-17Micro Processor Based over current trip device, Economical Thermal Magnetic &their accessories
4. Spring Charging Operations 18-19Manual & motor charging & accessories for closing operations
5. Electrical Tripping 20-21Shunt Trip, UVT & Control Devices
6. Type of Mounting 22-23Fixed, metal clad type, lifter, accessories for draw-out, safety shutter, position switch,S/C contacts, test jumper, mal-insertion prevention device
7. Other Accessories 24-26Aux. Switch, Key lock, Mechanical Interlock, Door Interlock, Lifter, carrying handle
8. Power Consumption 27Internal resistance, reactance & special environmental specifications
9. Clearance 28Clearance above Arc chute, maintenance space
10. Recommended Busbar Size 29Copper & Aluminium
11. Outline Dimensions 30-39Outline dimensions & Panel Mounting Details of D seriesACBs of 630A to 4000A & C series ACBs of 5000 to 6300A
General Appearance of Air Circuit Breaker (Type - AH-D Series)
8 type of Accessories for Drawout types, SafetyShutter, Position Switch, Test Jumper, Lifter, MalInsertion Prevention Device, Door Interlock withdefeat facility, Short Circuiting Contacts &Drawout position Padlock.
Vertical or horizontal bus bar connectionarrangement.
2, 3 or 4 Pole version available in all currentratings, in fixed & drawout execution.
Motor charging or manual charging, facilitatinglocal or remote control.
4 types of protection & trip devices:
a) Micro processor based RMS sensing over-current relay for industrial & generatorprotection.
b) Electromagnetic instantaneous trip device withthermal O/L Relay for S/C & O/L protectionfor AC system.
c) Undervoltage trip with or without time delayfor under voltage.
d) Making current release for safeguardingagainst closing of Breaker on S/C faults.
“C & S” Air Circuit Breakers are available in the current range of 630A to 6300A with“C & S” Air Circuit Breakers are available in the current range of 630A to 6300A with“C & S” Air Circuit Breakers are available in the current range of 630A to 6300A with“C & S” Air Circuit Breakers are available in the current range of 630A to 6300A with“C & S” Air Circuit Breakers are available in the current range of 630A to 6300A withwide choice of options & Accessorieswide choice of options & Accessorieswide choice of options & Accessorieswide choice of options & Accessorieswide choice of options & Accessories
1.0 Introduction
Introduction
5
Lightest and most compact for a given capacity.
Most simple to operate & maintain. Only ascrew driver a spanner required for replacingthe arcing contacts.
Only 4 frame sizes for entire range (630Ato 6300A), resulting in maximum interchangeability,commonality of parts and minimum inventoryof spares.
High breaking capacity, 50KA to 120KA andmaking capacity from 105KA to 264KA withline or load connected to upper or lowerterminals.
High speed operating Mechanism ensures atotal opening time of 30ms (including arcingtime of less than 10ms) and a total closingtime of 40m sec.
Neutral pole of 4 pole ACB is of same currentrating as of 3 pole.
Highest degree of system protection &coordination due to use of microprocessorbased protection release.
1.1 Salient Features
Internal Structure
Model: AH-6D, Draw-out, Motor Charging Type
S tored energy t ypeS tored energy t ypeS tored energy t ypeS tored energy t ypeS tored energy t ype1. Overcurrent trip device (Microprocessor based)2. Arc chutes3. Isolating contacts of control circuits4. Main circuit Terminals5. Draw out moulded base6. Main circuit terminals7. Isolating contacts of main circuits8. Fixed arcing contacts9. Moving arcing contacts10. Fixed main contacts11. Moving main contacts12. Closing mechanism13. Trip bar14. Inst. trip devices15. CT (for overcurrent trip device)16. Charging motor17. Closing latch release18. Closing spring19. Charging handle20. Quick close Slow close selector lever21. Auxiliary switches
Due to use of tungsten-silver sintered metalcontacts, high speed opening mechanism &electromagnetic instantaneous trip device, mostsuitable for capacitor switching & DCapplication.
High dielectric strength even in hot and humidconditions due to use of class ‘B’ and ‘F’insulating materials.
Comply with utilisation category B & pollutiondegree 3 Group I of IEC 947-Part I.
Can withstand impulse voltage of 8KV (peak),1.2/50 micro sec. wave as per case ‘A’ inhomogeneou s f i e l d c ond i t i on o fIEC 947-Part-I.
D-series Breaker fitted in Panel with door cutout meets IP42 protection.
Designed to provide continuous duty even inadverse environmental conditions.
Introduction
6
Introduction
1.2 Front Panel designed for the new Millennium
Rating Name Plate.Rating Name Plate.Rating Name Plate.Rating Name Plate.Rating Name Plate.
Close Open Cycle Counter (Optional).Close Open Cycle Counter (Optional).Close Open Cycle Counter (Optional).Close Open Cycle Counter (Optional).Close Open Cycle Counter (Optional).
Close Open IndicatorClose Open IndicatorClose Open IndicatorClose Open IndicatorClose Open Indicator.....
Open POpen POpen POpen POpen Position Position Position Position Position Padlock (Optional).adlock (Optional).adlock (Optional).adlock (Optional).adlock (Optional).
Push to Close Button.Push to Close Button.Push to Close Button.Push to Close Button.Push to Close Button.
Push to Open Button.Push to Open Button.Push to Open Button.Push to Open Button.Push to Open Button.
Close PClose PClose PClose PClose Position Position Position Position Position Padlock (Optional).adlock (Optional).adlock (Optional).adlock (Optional).adlock (Optional).
DrawDrawDrawDrawDraw-----out Pout Pout Pout Pout Position Position Position Position Position Padlock (Optional).adlock (Optional).adlock (Optional).adlock (Optional).adlock (Optional).
The front panel indicator provides Breakerposition indication:
"CONNECTED", "TEST" or
"ISOLATED"
The Panel Cutout Rubber Gasketprovides complete dust-proofprotection.
The shutter prevents errorneous insertion ofthe handle. This can be opened by loweringthe position stop release lever only when theBreaker is open.
When the Breaker is closed, the release levercan not be lowered. Thus, the shutter can notbe opened.
1111100000
1313131313
1212121212
1414141414
1616161616
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1212121212
1313131313
1414141414
1515151515
1616161616
Three Front Panel Cut-outs for entire range (630A to 6300A), help standardise your design
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1.3 High Breaking capacity and large shorttime current capacity
By fully utilising electromagnetic repulsive force, a large shorttime current and high breaking capacity is achieved in ourlight and compact design.
Light contact springs used to provide adequate contact pressureto keep the contact temperature well within limits and alsoto avoid contact bouncing.
A large short circuit current causes an electromagneticrepulsive force between the contact lead halves.
This repulsive force works in a direction to turn the movingcontact clockwise about the contact shaft, giving it more contactpressure proportional to the short circuit current.
When interrupting a large current, the electromagnetic repulsiveforce works in a direction to separate the moving contact fromthe stationary contact.
This electromagnetic repulsive force adds to the separatingforce of trip spring, resulting in a high speed interruption.
1.3.1 Complete Isolation of Poles
All the poles are completely isolated from each other as well asfrom operating mechanism by high grade insulating materials. Arobust design of Arc Chute in a temperature resistant mouldedbody and fitted with scientifically shaped Deion-Grids, totallyencompasses the poles.
The high short circuit arc gases thus escape through arc chuteonly which clears and cools the highest short circuit arc energyin less than 10ms. This isolation thus helps in providing highestinsulation properties as well as breaking capacity.
1.3.2 High AC dielectric withstand voltage
Due to the use of non-hygroscopic, glass fibre based insulatingmaterials and corrugated shape employed for better creepagedistance, the AH series can withstand a dielectric voltage of 3.5KVfor a minute.
1.3.3 Space saving & standardisation of Switchboarddesign
The light and compact ACBs in 4 frame sizes not only help instandardising the Switchboard design but also reduce the size ofload centre.
Four Breakers upto 1600A frame and 3 Breakers above 1600Aupto 4000A frame can be arranged vertically in standard heightof 2300mm.
1.3.4 Highly Resistant to Vibration
Smallness of each component due to rational design ensures a lowresponse factor to vibration and high natural frequency. The designis also highly resistant to vibrations as required in ships.
Introduction
T T
T T
T T T
T T T
T T T T
T T T T
T T T
upto 1600AF 2000AF 3200AF
2300
T
Compact Breaker leads to space savingin Switchboards
8
IEC
IS
BS
VDE
AS
2.0 Ratings & SpecificationsTYPETYPETYPETYPETYPE A H - 6 B / DA H - 6 B / DA H - 6 B / DA H - 6 B / DA H - 6 B / D A H - 8 B / DA H - 8 B / DA H - 8 B / DA H - 8 B / DA H - 8 B / D A H - 1 0 B / DA H - 1 0 B / DA H - 1 0 B / DA H - 1 0 B / DA H - 1 0 B / DAMPERES FRAME IEC,BS,VDE,AS, IS 630 800 1000
OOOOOTHER RATHER RATHER RATHER RATHER RATINGSTINGSTINGSTINGSTINGSshort time current RMS (kA) 1 sec [3 sec.] Icw 45 / [25]45 / [25]45 / [25]45 / [25]45 / [25] 45 / [25]45 / [25]45 / [25]45 / [25]45 / [25] 50 / [25]50 / [25]50 / [25]50 / [25]50 / [25]total breaking time (ms) / Rated Closing Time 30/40 30/40 30/40Spring Charging Time (sec.) max. 10 10 10Over all Dimension (mm) TPFixed (HxWxD) 487x398x379Drawout (HxWxD) 505x430x509
Rated thermal current in open Air.Higher breaking capacity ACBs available on request.DC rating is of special application available upto 14000 A
400
< I
n ≤
630
25
0 <
I n ≤ 400
400
< I n
≤ 60
0
630
< I n
≤ 10
00
Ratings & Specifications
600
<I n
≤ 80
0
9
Ratings & Specifications
Values when fitted with magnetic type instantaneous trip.0.05 seconds for Microprocessor instantaneous trip.
A H - 1 2 B / DA H - 1 2 B / DA H - 1 2 B / DA H - 1 2 B / DA H - 1 2 B / D A H - 1 6 B / DA H - 1 6 B / DA H - 1 6 B / DA H - 1 6 B / DA H - 1 6 B / D A H - 2 0 C / DA H - 2 0 C / DA H - 2 0 C / DA H - 2 0 C / DA H - 2 0 C / D A H - 2 5 C / DA H - 2 5 C / DA H - 2 5 C / DA H - 2 5 C / DA H - 2 5 C / D A H - 3 0 C / DA H - 3 0 C / DA H - 3 0 C / DA H - 3 0 C / DA H - 3 0 C / D A H - 4 0 C / DA H - 4 0 C / DA H - 4 0 C / DA H - 4 0 C / DA H - 4 0 C / D A H - 5 0 CA H - 5 0 CA H - 5 0 CA H - 5 0 CA H - 5 0 C A H - 6 0 CA H - 6 0 CA H - 6 0 CA H - 6 0 CA H - 6 0 C1250 1600 2000 2500 3200 4000 5000 63001250 1600 2000 2500 3200 4000 5000 6150- 1300 1850 2150 3100 3650 5000 53001200 1550 1950 2250 3200 4000 5000 6150- 1600 2000 - 3000 4000 5000 60002, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4
The thermal current ratings “Ith” of Circuit Breakersshown in ratings & specifications table onpage No. 8 are free air ratings i.e. in openexecution at 40oC ambient. The thermal ratings ofthe Circuit Breaker when mounted inside an enclo-sure depend upon:a) The dimensions of the cubical in which the
Breaker is mounted.
b) Ventilation area provided by way of louvers inthe Breaker cubicle.
c) Cross sectional area of the bus bars connectedto the Breaker terminals.
d) Ambient temperature other than 40oC
For ease of selection of our Breaker, keeping abovefactors into consideration, the thermal current ratings(I th) in an enclosure having ventilation &recommended ambient temperature are shown inthe table below:
Ratings & Specifications
2.2 Application
2.2.1 AC System
3 pole ACB for Industrial & Generatorapplication.
4 Pole ACB for complete safety in 3 phase 4wire distribution system as the neutral pole of4 pole ACB closes earlier & opens later thanother phase poles, thus effectively preventingtransient overvoltages on loads connectedbetween live & neutral lines.
2.2.2 DC System
2 pole ACB can be used on DC system wherethe short circuit breaking capacity requirementis not very high.
No teNo teNo teNo teNo te
1. The above enclosed thermal current ratings (Ith) have
been based when the Breaker Terminals are connected
with copper or aluminium bus bars of cross sectional
area as indicated in Table XI of IEC 947-2 & IS
13947-2.
2. C & S may be consulted, for thermal current ratings
in Enclosure with less ventilation area other than
shown in the above Table or at different ambient
temperatures.
3 pole ACB with 2 poles connected in seriescan be used in DC system where the shortcircuit breaking capacity requirement iscomparatively high.
A 4 pole ACB with 2 poles connected in parallelcan be used where the short circuit breakingcapacity requirement is low but the thermalcurrent rating is high. (For this application, theneutral pole closes alongwith the phase poles).Please clearly specify 4 pole ACB for DCapplication.
2.1 Conventional free air and enclosedcurrent ratings
S .S .S .S .S . Open AirOpen AirOpen AirOpen AirOpen Air With no Venti lat ionWith no Venti lat ionWith no Venti lat ionWith no Venti lat ionWith no Venti lat ion With Venti lat ionWith Venti lat ionWith Venti lat ionWith Venti lat ionWith Venti lat ion V e n t i l a t i o nV e n t i l a t i o nV e n t i l a t i o nV e n t i l a t i o nV e n t i l a t i o n M i n .M i n .M i n .M i n .M i n . e n c l o s u r ee n c l o s u r ee n c l o s u r ee n c l o s u r ee n c l o s u r e d i m e n s i o n sd i m e n s i o n sd i m e n s i o n sd i m e n s i o n sd i m e n s i o n s ( m m )( m m )( m m )( m m )( m m )N o .N o .N o .N o .N o . R a t i n gR a t i n gR a t i n gR a t i n gR a t i n g DepthDepthDepthDepthDepthAt 50At 50At 50At 50At 50oooooCCCCC WidthWidthWidthWidthWidth HeightHeightHeightHeightHeightarea cm sq.area cm sq.area cm sq.area cm sq.area cm sq.At 40At 40At 40At 40At 40oooooCCCCC At 50At 50At 50At 50At 50oooooCCCCC At 40At 40At 40At 40At 40oooooCCCCC
11
2.3 A Wide Selection of Specifications
Various specification are available for wide selection to suit any particular application as well as local regulationsand requirements.
Ratings & Specifications
630 A
800 A
2000 A
2500 A
3200 A
4000 A
5000 A
6300 A
Fixed type Metalcladconstruction
Motor charging typeManual charging type
Power transformer
Spring charged switch
Draw-out type(standard)
Safety shutter Position switch Short-circuiting contact
Mal-insertion prevention device Lifter Test jumper
OCR Alarm switch
DC24V power supply
OCR checker
CT for Neutral line
Trip indication switch
Shunt trip Undervoltage tripWith or without T.D.
Close-open cycle counter
Key lock / Castle lock Key interlock system
Air Circuit Breaker is assembled to comply with your specifications
Note : Tropicalisation, cold climate treatment available on request at extra cost.
C - Series D - Series
The rma l Magne t i c t ypeThe rma l Magne t i c t ypeThe rma l Magne t i c t ypeThe rma l Magne t i c t ypeThe rma l Magne t i c t ype
1000 A1250 A1600 A
fo r gene ra to rfo r gene ra to rfo r gene ra to rfo r gene ra to rfo r gene ra to rP r o t e c t i o nP r o t e c t i o nP r o t e c t i o nP r o t e c t i o nP r o t e c t i o n
Adjustable L.T.D.
Adjustable S.T.D.
Making current release
fo r Gene ra lf o r Gene ra lf o r Gene ra lf o r Gene ra lf o r Gene ra lI ndus t r i a l P l an tI ndus t r i a l P l an tI ndus t r i a l P l an tI ndus t r i a l P l an tI ndus t r i a l P l an t
Adjustable L.T.D.
Non adjustable INST.
SELECTION ASELECTION ASELECTION ASELECTION ASELECTION AT YT YT YT YT YOUR OPTIONOUR OPTIONOUR OPTIONOUR OPTIONOUR OPTION
1
2
3
4
5
6
* L.T.D. means Long Time Delay* S.T.D. means Short Time Delay
7
8
9
10
Types ofMounting
Accessories fordraw-out type
Types of closingoperation
Accessories forclosing operation
Accessories forovercurrenttrip device
Other trips
Otheraccessories
Types &series ofBreaker
OvercurrenttripDevices
BreakerRating
ITEMITEMITEMITEMITEM
Mic ro M i c ro M i c ro M i c ro M i c ro p roces so rp roces so rp roces so rp roces so rp roces so r basedbasedbasedbasedbased
fo r Gene ra lf o r Gene ra lf o r Gene ra lf o r Gene ra lf o r Gene ra lI ndus t r i a l P l an tI ndus t r i a l P l an tI ndus t r i a l P l an tI ndus t r i a l P l an tI ndus t r i a l P l an t
Adjustable L.T.D.
Adjustable S.T.D.
Adjustable INST.
AdjustableGround-fault
Making currentrelease
12
3.0 Multi Function Protection Devices
3.1 Microprocessor Based Overcurrent Trip Device: “Type μμμμμIT”
μμμμμIT is a true RMS sensing overcurrent trip device, requiring no external supply for itsbasic function. It is available in two types, i.e., μμμμμIT–100 for industrial application andμμμμμIT–G for generator protection.
Overload (L.T.D.) current setting DIP switch.
Overload (L.T.D.) tripping time delay setting DIP switch.
Short circuit (S.T.D.) current setting DIP switch.
Short circuit (S.T.D.) tripping time delay setting DIP switch.
Instantaneous short-circuit current setting DIP switch.
Earth fault tripping current setting DIP switch.
Earth fault tripping time delay setting DIP switch.
Built-in operation checking DIP switch.
Function blocking DIP switch.
Reset switch.
LED Indicators.
Salient Features
Error free and user friendly settingof current and time delay.
Provides highest degree of systemprotection coordination.
Self powered by the built in currenttransformer.
No mal-operation due to externaldisturbances.
Built in operation check function.
Visual fault discrimination by LEDs.
Three phase and earth fault in onesingle compact unit.
Self monitoring of trip unit withblinking indication.
Function Blocking facility provided.
Certified by ERTL for
– Damp Heat Test IS 9000-PG4
– Dry Heat Test IS 9000-PG3
– Vibration Test IEC255-4
– Radio FrequencyInterference (RFI) IEC801-3
– Electrostatic Discharge(ESD) IEC 801-2
– Electrical Fast Transient(EFT) IEC 801-4
– Surge IEC 801-5
– Impulse IEC 255-4
Note : μμμμμIT-G is similar to μμμμμIT-100 in construction and function but differs in current and time settings
S T D C u r r e n t :S T D C u r r e n t :S T D C u r r e n t :S T D C u r r e n t :S T D C u r r e n t : Minimum setting 4 x InSetting range 4, 5 ... 10 (in steps of 1)
S T DS T DS T DS T DS T D T i m e :T i m e :T i m e :T i m e :T i m e : Minimum Setting 50 ms
Delay Setting Range 50, 100, ... 550 ms.
(in steps of 50 ms)
3.1.4 Function Blocking
In normal running operation of unit, any ofthe four function can be blocked by turningthe DIP switches to ON position.
3.1.1 Setting of Over Load Current(LTD)
LLLLLTDTDTDTDTD Current :Current :Current :Current :Current :Minimum setting is 0.5 times In
Setting range: 0.5, 0.55 ...1.15(in steps of 0.05)
LLLLLTDTDTDTDTD TTTTT ime:ime:ime:ime:ime: Minimum Setting - 2.5 sec.Delay Setting range: 2.5, 5 ....... to 35 sec.
(in steps of 2.5 sec.)
3.1.5 Ground Fault Setting (GFT)
G F T C u r r e n t :G F T C u r r e n t :G F T C u r r e n t :G F T C u r r e n t :G F T C u r r e n t : Minimum Setting 15% of In
Setting Range 15, 20, ... 50 %(in steps of 5%)
GFT GFT GFT GFT GFT TTTTTime:ime:ime:ime:ime: Minimum Setting 50 ms
Delay Setting Range 50, 100, ... 550 ms(in steps of 50ms)
3.1.3 Setting of Instantaneous Current
C u r r e n t ( I N S )C u r r e n t ( I N S )C u r r e n t ( I N S )C u r r e n t ( I N S )C u r r e n t ( I N S ) ::::: Minimum setting 4xIn
LLLLL T DT DT DT DT D S e t t i n g s :S e t t i n g s :S e t t i n g s :S e t t i n g s :S e t t i n g s : a) Minimum setting is 1 times In
S e t t i n gS e t t i n gS e t t i n gS e t t i n gS e t t i n g R a n g e :R a n g e :R a n g e :R a n g e :R a n g e : 1 to 1.3 In (in steps of 0.05)
b) Time = 15 to 65 sec at 120% Inmin. settings 15 sec (in steps of 5 sec.)
3.1.7 Setting of Short Circuit (STD)
S T DS T DS T DS T DS T D S e t t i n g s :S e t t i n g s :S e t t i n g s :S e t t i n g s :S e t t i n g s : a ) Current = 2 to 5.75In(in steps of 0.25)
b) Time = 50msec. to 420msec.(in steps of 50 msec.)
LED IndicationLED IndicationLED IndicationLED IndicationLED Indication
ON - LEDON - LEDON - LEDON - LEDON - LED ::::: This will indicate normal operation of unit.
All the other three LEDs will glow on their respective faults.
Reset switch is given to reset the LEDs.
Multi-Function Protection Devices
Setting Example
DIP Switch Position
OFF
ON
LTD Time = 25 Sec.
LTD Current IO =1.25*In
X = 2.5
t = X+(a+b+d)
a = 2.5
b = 5
c = 10
d = 15
25 Sec = 2.5+(2.5+5+15)X = 1.0
a = 0.05
b = 0.05
c = 0.10
d = 0.10
IO = X+(a+c+d)1.25 = 1.0+(0.05+0.1+0.1)When X - min. valueabcd - settings
3.1.8 Test Mode
by 24V DC for testing the trip unit without injecting currentS t e p 1 :S t e p 1 :S t e p 1 :S t e p 1 :S t e p 1 : Put the DIP switch to TEST POSITIONS t e p 2 :S t e p 2 :S t e p 2 :S t e p 2 :S t e p 2 : Put the LONG or SHORT switch to ON
position.μIT will give trip command dependingupon the time set on respective LTD or STDtime delay DIP switches.
CAUTION : In normal running condition all the Test ModeDIP switches should be in OFF position (Normal position)
15
Multi-Function Protection Devices
A direct acting electromagnetic instantaneoustrip device with fixed current setting for shortcircuit protection.
CT actuated thermal O/L Relay used along withShunt Trip or Undervoltage Trip Device forO/L protection
Trip testing at CT secondary current levels.
3.2 Economical Thermal Magnetic type 3.2.1 Base Current (In) (for Microproces-sor & Thermal Magnetic Types)
M i c r o p r o c e s s o r TM i c r o p r o c e s s o r TM i c r o p r o c e s s o r TM i c r o p r o c e s s o r TM i c r o p r o c e s s o r Ty p e a n d y p e a n d y p e a n d y p e a n d y p e a n d TTTTT h e r m a lh e r m a lh e r m a lh e r m a lh e r m a lMagnetic TMagnetic TMagnetic TMagnetic TMagnetic Typeypeypeypeype both have a single basecurrent that corresponds to one of the ratedcurrents available. When ordering, specify thebase current (In) that is higher than and closestto the rated load current passing through theAir Circuit Breaker.
Base Current (IBase Current (IBase Current (IBase Current (IBase Current (Innnnn) [A]) [A]) [A]) [A]) [A] Base Current (IBase Current (IBase Current (IBase Current (IBase Current (Innnnn) [A]) [A]) [A]) [A]) [A]
Tripping Characteristics of Thermal Magnetic Trip Device
MCR instantaneously trips the Breaker without anyintentional time delay during closing operation, if themaking current exceeds a predetermined value andwhich is rendered inoperative when the CircuitBreaker is in closed condition. When the Breakeris closed on to a normal circuit condition, MCRbecomes inoperative affecting normal coordinatedsystem protection, thus most suitable for incomerBreaker.
3.2.2 Current Setting of the nonadjustable magnetic instantaneous tripand MCR (kA)
* Select and specify one of the 10 15 20 20 25 25 25 pick-up currents from the 15 20 25 25 30 30 30 table 20 25 40 40 * Tolerance is + 20% 50 50
Note : : Applicable where the rated current of overcurrent trip devices is not less than 250A. : Applicable to AH-10D and AH-12D. Default Setting for 16D Default Setting
A short time delay tripping ACB fitted with MCR canthus utilise its full particular time capacity by forminga selective tripping system with the other Breakerand can rapidly clear the faulty circuit without anytime delay when the Operator attempts to close it.
MCR
Operative
Arcing ContactsClose
Contacts Start tomove
Latched in
MCR Inoperative MCR Inoperative
Short-circuit current may flow
Closed Condition
Main ContactsClose
Closing Process
Closing Stroke
How MCR Operates
EL
EC
TR
OM
AG
NE
TIC
EL
EC
TR
OM
AG
NE
TIC
EL
EC
TR
OM
AG
NE
TIC
EL
EC
TR
OM
AG
NE
TIC
EL
EC
TR
OM
AG
NE
TIC
Multi-Function Protection Devices
17
3.3.1 OCR Alarm Switch
This switch operates when the Air CircuitBreaker is tripped by the overcurrent device.Any of LTD, STD, INST or earth-fault tripcauses operation of this OCR alarm switch.
Its operation is as follows : normally OFF,ON for about 30 ms during ACB contactseparation, then OFF again. Use a suitableself-hold circuit for continuous OCR tripalarm indication.
3.3.2 2 4 V DC Power Supply
(T(T(T(T(To be fitted in the Po be fitted in the Po be fitted in the Po be fitted in the Po be fitted in the Panel)anel)anel)anel)anel)
Supplies 24V DC power to the micro-processor over-current trip device for :
- device function check purposes and
- for lighting the OCR trip indicators(LEDs).
3.3.3 OCR checker (outside)
Type : RCU - 2Power : 500VA, 50/60Hz 240VConsumptionTest : i) Calibration of current Functions
& time settings ofLTD, STD, Instantenous &Ground Fault
ii) Function Checkby 24V DC.
iii)Closing Openingtime of ACB
Dimensions : 545W x 420D x 345HWeight : 28 kg
3.3.4 Phase & Neutral CTs
Polyester resin cast 5A secondary, 5VA, class 5P10 precision CTs are rigidly mounted on the lower terminalsof the Breaker. The CTs thus provide most reliable and accurate current signals to the protection deviceseven in adverse environmental conditions.
The CT used for detecting a neutral line current in a 3 pole Breaker of a 3 phase four wire system,is mounted outside on the neutral bus bar. This CT is necessary when over current trip device is havinga ground fault protection element.
However, in a 4 pole Breaker, the neutral CT is rigidly mounted on the neutral terminal of the Breaker.
3.3 Accessories for Overcurrent Trip Devices
“Lamp” is a resistive load of positive temperature coefficient withinrush in excess of 10 times the normal current.
“Inductive” is a load whose power factor is 0.4 or more (AC)or time constant is 7 ms or less (DC)
“Motor” assumes starting current of 6 times the specified value.
RatingsRatingsRatingsRatingsRatings
Number o f con tac t sNumber o f con tac t sNumber o f con tac t sNumber o f con tac t sNumber o f con tac t s 1a1a1a1a1aC i r c u i t r yC i r c u i t r yC i r c u i t r yC i r c u i t r yC i r c u i t r y R e s i s t i v eR e s i s t i v eR e s i s t i v eR e s i s t i v eR e s i s t i v e L a m pL a m pL a m pL a m pL a m p I n d u c t i v eI n d u c t i v eI n d u c t i v eI n d u c t i v eI n d u c t i v e M o t o rM o t o rM o t o rM o t o rM o t o rR a t e dR a t e dR a t e dR a t e dR a t e d 480V 3 0.3 2 0.4currentcurrentcurrentcurrentcurrent (A)(A)(A)(A)(A) AC 250V 5 2 5 3
125V 5 3 5 4250V 0.3 0.05 0.3 0.05
DC 125V 0.6 0.1 0.6 0.130V 7 4 6 4
Dimension Drawing of 24V DC Power Supply UnitDimension Drawing of 24V DC Power Supply UnitDimension Drawing of 24V DC Power Supply UnitDimension Drawing of 24V DC Power Supply UnitDimension Drawing of 24V DC Power Supply Unit
The closing springs are manually charged by pumpingthe charging handle. When PUSH TO CLOSE buttonis pressed, the charge of the closing springs isreleased, quickly closing the Breaker.
A closing coil (Latch Release Coil-LRC) can beprovided for remote closing operations, however,the closing springs would have to be chargedmanually before doing a remote close operation.
4.2 Charging of Springs by Motor
The closing Springs are charged by an ElectricMotor. A closing command from an external “PushButton” energises the LRC (Latch Release Coil) whichreleases the charge of the closing spring to quicklyclose the Breaker.
With the Breaker closed, the Motor automaticallystarts to charge the spring again for the next closingoperation.
Manual charging is also possible in Motor chargingtype.
Motor Charging typeMotor Charging typeMotor Charging typeMotor Charging typeMotor Charging type
4.3 Rating of Motor charging -Spring release type
Rated voltage (V) Min. And Max. Inrush current (A) Steady-state current Charging Closing Command
50/60 Hz Operating Voltage (peak value) (AC:RMS value) time (S) current (A) Max.
The charging motor is of short-time rating and the number of repeated open close cycles mustbe limited to 15 cycles followed by a cooling period of at least 20 minutes for further operations.
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4.4 Motor Charging And Closing Operation Circuit
4.4.1 Charging of Closing Springs
When the closing springs are "DISCHARGED",the “spring charged OFF” switch in series withthe motor, is closed.
Control voltage is applied to terminals 1 and2 and the motor starts to charge the springs.
When the closing springs are fully charged, the“spring charged OFF” switch in series with themotor opens and cuts the supply to the motor.
4.4.2 Closing the ACB
When the springs are charged, the "springcharged ON switch" in series with the LRC isclosed.
Apply voltages across terminals 3 and 4through PB (close). The latch release coil (LRC)is energised and the closing springs are
released to close the ACB.
With the release of Closing Spring charge, the“Spring Charged On Sw” opens and the supplyto the LRC is cut OFF through the Aux.Sw.B1Contact which opens when the ACB gets closed.
4.4.3 Anti-Pumping Function
Once the closing spring have been released the“ACB Reset OFF” switch is closed. If a closedsignal is continuously applied across theterminals 2 and 3, the holding relay (HC) isenergised and self holds when the HC/1 contactcloses.
The HC/2 contact opens, cutting the supply tothe LRC, ACB can not reclose without openingthe PB (Close).
When ACB is fitted with under voltage trip UVTand tripped by it (voltage below opening value).
ACB will not reset until voltage above resettablevalue is supplied to UVT.
Closing Operation Circuit
M Charging motor
LRC Closing Latch Release
HC Anti Pump Relay of ACB
B1 Aux. Switch of ACB
PB Control Switch
Isolation Contact
The circuit may be separated into aclosing control and a motor circuit onrequest, so that they can be individuallyenergised.
Spring Charging Operations
The diagram shows the condition when closing springs are uncharged and ACB is tripped (not reset yet).
Closing Coil Rated Voltage (V) Min & Max. Excitation Closing Time(Max.)Type 50/60 (Hz) Operating (Excitation) Current Peak (A) (ms)
Min Max Voltages (V) (at Voltage)
AC 420 480 357-528 1.5 (415V)380 420 323-462 1.9 (380V)
Technical specification for operation of closing coil device
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4.5.1 Power Transformer OutsideWhen the control supply voltage is higher than230V AC, our special Step Down Transformer ora 350VA Transformer with 220V secondary shouldbe used for electrical charging operation.
4.5.2 Spring Charged SwitchProvides a NO (1a) contact signal, which is closedwhen the closing springs are fully charged. Usedfor indication at a remote place, from whereclosing is made.
RatingsRatingsRatingsRatingsRatings
250V AC - 15A, 250V DC - 0.25A
480V AC - 5A, 125V DC - 0.5A
5.0 Electrical Tripping5.1 Shunt Trip
The shunt trip device is used to electrically openor trip the Air Circuit Breaker from a remote place.The tripping commands to the shunt trip includethose from an overcurrent relay, reverse powerrelay, and similar protective relays.
No t e t ha t t h e s hun t t r i p u s e s one“a”-contact of the auxiliary switch.
4.5 Accessories For Closing Operation
Electrical Tripping
5.2 Undervoltage Trip
The undervoltage trip automatically opens the AirCircuit Breaker when the voltage supplied to it dropsbelow the opening voltage. It resets automaticallyon recovery of the supply voltage above theresettable value, and allows for closing of the AirCircuit Breaker. The undervoltage trip consists of anundervoltage trip device built-in the ACB and UVTControl Device installed external to the ACB.
Shunt trip Rated Voltage (V) Min & Max. Excitation Opening Time(Max.)Type 50/60 (Hz) Operating (Excitation) Current Peak (A) (ms)
Technical specification for operation of UVT device
Shunt Trip
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Type AUH-V is without time-delay, and is used
for AC supply. It trips the ACB immediately on
dropping of the supply voltage below the
opening value.
AUH-V-T is also for AC supply but with a time-
delay of 500 ms. It effectively prevents the
overiding of the short time delay over current
trip function caused by short circuit fault &
simultaneous voltage drop.
5.2.1 UVT Control Devices
Type AUH-1SC is without time delay and is
suitable for DC supply only.
The undervoltage trip, when in operation with
supply voltage below resettable value, keeps
the closing control circuit open and locks out
the PUSH TO TRIP button.
Electrical Tripping
Three Types of Control Devices are available
AC - rated Undervoltage Trip Control Circuit DC - rated Undervoltage Trip Control Circuit
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The following types of accessories are available fordraw-out type Air Circuit Breaker.
6.4.1 Safety Shutter
When the Breaker is drawn out, it protectsthe operator from accidental contact with thelive parts by automatically concealing themain circuit on the draw-out frame side withinsulating barrier.
The shutter has a tamper proof lockmechanism. As the Breaker is inserted into thedraw-out frame, it unlocks automatically tofree the shutter and the shutter opens.
The shutter can be padlocked in the shutposition.
Labels, "BUSBAR" and "CIRCUIT", are suppliedto indicate the line-side and load-side maincircuit terminals, respectively, and they are tobe affixed by the user.
6.4.2 Position Switch
There is 1NO contact to indicate the "TEST" positionand 1NC contact to indicate the "CONNECTED"position.
RatingsRatingsRatingsRatingsRatings
250V AC - 15A, 250V DC - 0.25A
480V AC - 5A, 125V DC - 0.5A
6.4.3 Short-Circuiting Contacts
The short-circuiting contact shorts out the associatedauxiliary switch b-contact when the Breaker is in thetest position or further out position. Therefore, theb-contact circuit with this short-circuiting contactremains closed even when the Breaker is closed atthe test position.
6.4 Accessories (Optional) for Draw-out Breaker
6.1 Fixed Type
This consists only of the Circuit Breaker fitted withbrackets to enable it to be permanently mountedinside the Panel and the bus bars are directlyconnected to its terminals.
6.2 Metal Clad Type
The metal clad type consists of a fixed or draw outCircuit Breaker housed in a steel enclosure. Thiscan be used as a single pole mounted ACB or canbe readily constructed in a load centre by simplyplacing them one upon another in a tierarrangement.
6.3 Draw out type
This consists of a Circuit Breaker and a draw-outcradle. The Circuit Breaker can be withdrawn toany of the four draw out positions i.e. "CONNECTED","TEST", "DISCONNECTED" & "REMOVED".The Circuit Breaker body is kept connected to earththrough earthing shoes to the draw out frame in"CONNECT", "TEST" or in between to provide totalsafety to the Operator. The Panel door can be keptclosed in "CONNECTED", "TEST" & "DISCONNECTED"position.
6.0 Types Of Mounting
Type of Mounting
1. Connected Position
2. Test Position
3. Isolated Position
4. Remove Position
Both main and controlcircuits are connectedfor normal service
The main circuit is Isolatedand the control circuits areconnected. This positionpermits operation tests withthe switchboard panel shut.
Both main and controlcircuits are isolated. Theswitchboard panel doorcan be shut. Earth circuitstill connected.
The ACB is completely re-moved from the cradle.
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Type of Mounting
This contact is useful when forming an interlockcircuit with another Breaker or Breakers or whenpreventing the test operation at the test position fromcausing any unwanted operation in the associatedcircuit.
The short-circuiting contact is open when the Breakeris in the connected position, and it can be fittedin parallel with any of the auxiliary switch circuits,B2, B3, B4 and B5.
6.4.4 Test Jumper
The test jumper allows checking of all functions onthe removed Breaker on a Test Bench and can besupplied on request.
6.4.5 Mal-Insertion Prevention Device
A good interchangeability exists in the C&S -AirCircuit Breakers and because of this feature, thereis a possibility for a Breaker of a different ratingbeing placed into the cradle of other rating. Thisis effectively prevented by the use of the Mal-insertion Prevention Device.
6.4.6 Lifter
A Sleek Lifter with variable size loader to suite allsizes of ACB or with a platform for safely handlingthe Breaker in plant or for mounting or removingthem from the panel are available.
6.4.7 Padlocking for user safety
Circuit Breakers are provided with Padlocking facility
on push to Trip & Push to Close button to avoid
accidental operation of breaking by unauthorised
persons.
The padlocking arrangement has also been provided
in drawout Breakers in all the 3 positions i.e.
"CONNECT", "TEST" & "DISCONNECT" positions.
This not only provides additional safety to the
Operator but also prevents the Breaker dislocation
due to vibration and shocks.
L i f t e rL i f t e rL i f t e rL i f t e rL i f t e rPadlock Facility
Safety Shutter
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7.1 Auxiliary Switch
The auxiliary switch is an assembly of auxiliary contactsmechanically operated by the Air Circuit Breaker toelectrically indicate whether the Breaker is closed or open.
Every Air Circuit Breaker is fitted with an auxiliaryswitch. The Aux. Sw Contacts can be provided infollowing combinations and out of which some contactsare utilised for various accessories fitted in Breakeras shown in the table.
7.2 Combination of Aux. SW Contacts
AuxAuxAuxAuxAux SwSwSwSwSw
14 way 7-a-contact and 7-b-contacts (7a, 7b)
10 way 5-a-contact and 5-b-contact (5a, 5b)
5 way 3-a-contacts and 2-b-contacts (3a, 2b)
or
2-a-contacts and 3-b-contact (2a, 3b)
7.3 Trip Indication Switch
This switch closes (ON) when the Air Circuit Breaker istripped by overcurrent trip, shunt trip, undervoltage trip ormanual operation of PUSH TO TRIP buttons.
The table shown summarizes when the trip indication switchoperates (ON) and when it is reset (OFF).
Use a suitable self hold circuit as necessary for continuoustrip alarm indication.
TTTTTy p ey p ey p ey p ey p e AXH-1AXH-1AXH-1AXH-1AXH-1
Numbers o f con tac t sNumbers o f con tac t sNumbers o f con tac t sNumbers o f con tac t sNumbers o f con tac t s 5a 5b5a 5b5a 5b5a 5b5a 5b
Ra ted cur ren t (A )Ra ted cur ren t (A )Ra ted cur ren t (A )Ra ted cur ren t (A )Ra ted cur ren t (A ) AC 450V 7
AC 220V 7
AC 110V 7
DC 250V 2.5
DC 125V 4
Accessory Fixed Draw-out
Charging Motor 1b 1b
Shunt Trip / UVT 1a 1a
Over Current Trip Device 1a 1a
Metal Clad - 1a, 1b
Aux i l i a r y Con tac t s UsedAux i l i a r y Con tac t s UsedAux i l i a r y Con tac t s UsedAux i l i a r y Con tac t s UsedAux i l i a r y Con tac t s Used
Turn OFF on completion ofspring charging
Turn OFF on recovery ofvoltage above resettable
value and on completion ofspring charging
Turn OFF on completion ofspring charging after release
of button
PUSH TO TRIPbutton pressed
Remoteopening
Undervoltagebelow opening
value
Undervoltagetrip
Overcurrent trip-shunt trip
Cause of Operation Resetting Condition
*Rating of TIS are same as of OCR Alarm SW
Other Accessories
6.4.8 Door Interlock
The door interlock prevents the switchboard door frombeing opened when the Breaker is CLOSED.
The door is operational only when the Breaker isOPEN. It is also fitted with a lock release. Installationof the door interlock requires a simple drilling of theSwitchboard Panel door.
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Breaker 3 cannot be closed
Breaker 2 cannot be closed
Breaker 1 cannot be closed
Other Accessories
7.5 Key Interlock System
A system of key locks used to interlock a number of
Breakers.
The key is removable only when the Circuit Breaker
is locked open.
Application ExampleApplication ExampleApplication ExampleApplication ExampleApplication Example
Incoming power Breakers 1 and 2 feed two bus
sections, which are connected by a bus-tie-Breaker-3.
When the bus-tie Breaker is closed, parallel feeding
with both Breaker 1 and 2 closed should not be
possible.
In this case, the same-numbered locks are fitted in
all the 3 Circuit Breakers and only two keys are used,
so that the bus-tie Breaker can be closed only when
either the Breaker 1 or 2 is locked in the open position
and that the Breakers 1 and 2 can be closed only
when the bus-tie Breaker is locked open.
A key lock device that is ready for use when a Castle
key lock (to be provided by the user) is fitted, is also
available.
7.6 Operation Counter
A four digit mechanical counter can be fitted with
display window on the front panel to show the number
of operations and to facilitate routine maintenance
after specified number of operations.
7.4 Key Lock & Castle Lock
It locks the Breaker in CLOSED or OPEN position, anda key is necessary to unlock so that only the authorisedoperator can operate the Breaker and prevent it frombeing operated by unauthorised persons.
KeyKeyKeyKeyKey LockLockLockLockLockLOCK-IN-OPEN TYPELocks the Breaker in open position.
LOCK-IN-CLOSED TYPELocks the Breaker in CLOSED position.(Specify either type when ordering).
Cast leCast leCast leCast leCast le LockLockLockLockLockA device that is ready for use, when a Castlekey lock is fitted is also available (specify typeof Castle lock when ordering).
Key Lock Castle Lock
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7.7 Mechanical Interlock
Two Breakers can be mechanically interlocked. TheMechanical Interlock is available to any combinationi.e. in a vertical or horizontal arrangement betweenany frame size in fixed or drawout version.
7.8 Lifting Plate
For use with hooks, ropes etc. when lifting theBreaker.
7.9 Carrying Handle
For the purpose of lifting by hand.
7.10 Door Flange
Provided with D-Series ACB‘s to cover the panel cut-out of the board.
7.11 IP Cover
Mounted on the Switchboard Panel door to provideIP55 degree of protection as defined in IEC529.
Carrying Handle
IP Cover
Other Accessories
Horizontal Type Vertical Type
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8.1 Special Environment Specs.
If the Breakers are to be used under abnormalenvironmental conditions, specify the applicabletreatment given below :
8.1.1 Moisture Treatment
This treatment is recommended for Breakers whichare to be used in areas where both temperature& humidity are higher i.e. Ambient temperature60oC or less & relative humidity 95% or lessprovided no condensation.
8.0 Multivolt drop, power consumption, (per pole)
Power Consumption
8.1.2 Anti-Corrosion Treatment
This treatment is recommended when Breakers areto be used in highly saline atmosphere or in chemicalplants.
8.1.3 Cold Climate Treatment
This treatment is provided when the Breaker is tobe used in very cold areas i.e. Storage - 40oC, Use-25oC Provided no condensation or freezing.
AH-6D fixed type 4.8 17.2
AH-8D draw-out type 8.04 28.2
AH-10D fixed type 3.0 30.0
AH-12D draw-out type 5.0 60.0
AH-16D fixed type 2.4 61.4
draw-out type 4.08 104.4
AH-20D fixed type 1.8 72.0
draw-out type 3.0 120.0
AH-25D fixed type 1.44 90
draw-out type 2.40 150
AH-30D fixed type 1.32 134.4
draw-out type 2.28 235.0
AH-40D fixed type 0.96 169.0
draw-out type 1.8 288.0
AH-50C draw-out type 1.6 350.0
AH-60C draw-out type 1.2 430.0
}
Power consumption(W) (Max)
}
Model No. & TypeMultivolt drop
per phase(mv) (Max)
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Clearance
Clearance above Arc chute, maintenance space
from the Breaker bottom level.For fixed type air circuit Breakers,a l so , p rov ide a su f f i c i en tmaintenance space around thebeaker.
If an arc barrier is provided withinthe recommended maintenancespace , make the B reake rremovable.
Arc gases expel out from the arcchutes when the Breaker interrupta short circuit fault current. It istherefore necessary to keep thearea above these arc chutes clearof any metallic objects, includingelectric devices and earthedstructures, at least by the distance
shown below in reference to theBreaker bottom level. If theprovision of such distance isimpracticable, then provide abarrier of heat and flame resistantinsulating material and of sufficientsize to cover all arc chutes at theposition indicated also as minimum
9.0 Clearance Above Arc Chute, Maintenance Space
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