Mpact Brochure

GE Power Controls

M - PACT Air Circuit Breakers

M-PACT Air Circuit Breakers


M-PACT A C B

Tomorrow’s Requirements Today

M-Pact cassette type air circuit breaker alone offer certified test evidence, conforming that thestandard unit will retain its tested integrity when fitted in custom-built switchboard or motorcontrol centres. This is endorsed by leading consulting engineers, specifying authorities anddiscerning switchboard and motor control gear manufacturers.

The unique cassette type enclosure on withdrawable circuit breakers, guarantees the operatingenvironment. The user, therefore, can be certain that the independently certified test evidenceremains entirely valid when the circuit breaker is in the switchboard.

This is not the case with circuit breakers supplied in an ‘open type’ cradle of chassis arrangementwhich inevitably have been tested in conditions of ‘free air’ and not the final working enclosure.

Features

Salient Features

- Air Circuit Breakers are supplied in cassettes. This cassette assures 100% guarantee forshort circuit performance, since the proving tests have been conducted on Air CircuitBreakers in “cassettes”.

- Three basic frame sizes cover ratings from 630A to 4000A.

- ACBs are suitable for either Manual (IMS) or Motor operation (MWS).

- Each circuit breaker is provided with distinct SERVICE/TEST/ISOLATED positions.

- Tested to category P2 with either side alive. Incoming connections can be made either toupper or lower terminals.

- Static trip releases provided on the ACBs have highly flexible trip characteristics for perfectco-ordination.

- ACBs are provided with inherent safety interlocks/features such as safety shutters and doorinterlocks.

- Robust and tripfree mechanism.

- Compliance with Indian and International standards.

- Approved by major specifying authorities.

- Tested by CPRI / other independent test authorities.

Safety Features

- Cassette door can be opened only by means of tools to prevent unauthorised opening.

- Access flap locking prevents unauthorised operation.

- Independent Manual Spring closing mechanism permits safe closing on to high faultcurrents.

- Safety shutters• Automatic shrouding of main contacts by a safety shutter thus preventing inadvertent

contact with isolating contacts when breaker is withdrawn from the cassette.

• Manual padlocking of safety shutters can be provided optionally.

- The cassette and the breaker are provided with the following built-in interlocks :

• The breaker cannot be closed in any intermediate position other than the three distinctpositions,SERVICE/TEST/ISOLATED.

• When the breaker is closed, the hinged door of the cassette can not be opened.

1


Safety Features (Contd..)

• While withdrawing the moving portion from the cassette, astop on the guide rails prevents accidental falling down ofthe circuit breaker.

• A circuit breaker of one thermal rating cannot be put into thecassette of another air circuit breaker of different thermalrating.

• Optional safety interlock (DOI) can be provided such thatthe door of the cassette cannot be opened till the breaker isracked into the ISOLATED position. While racking in, thebreaker cannot be moved from ISOLATED to the TESTposition unless the door is closed. It will be possible,however, for a competent operator to defeat the interlockand put the breaker in the TEST position with the dooropen. But the door of the breaker cannot be closed unlessthe breaker is brought back to the ISOLATED position.

- The moving portion of the breaker is provided within a heavy dutyplug-in type earth contact which makes before and breaks after themain isolating contacts during the insertion into and withdrawalfrom the service position of the breaker. This earth contactremains connected from the service to the isolated position of thebreaker.

- PVC arc baffles are provided above the arc chutes to let outionized gases and thus preventing phase to earth short circuit.

- Optional fault lock-out/Antipumping Device can be provided so thatthe breaker cannot be reclosed after tripping on fault. The breakercan be closed only after manual reset is done, and that too afteropening the cassette door.

Construction

The circuit breaker is supplied fully enclosed in cassettes, designed forease of construction of switchboard. The cassette can be easilyhandled and mounted and is not liable to distortion and misalignment.

The formed and welded steel construction is given corrosive resistanttreatment following fabrication work. The cassette and doors arefinished with stoved enamel paint.

The breaker has three distinct position, SERVICE/TEST/ISOLATED,within the cubicle, and this is achieved by a racking cam and slide railsoperated from the front of the equipment. Isolated conditions simplifiesinspection, and from this position the circuit breaker can be completelywithdrawn from the housing.

The breaker can be withdrawn to TEST and ISOLATED positions withthe cassette door closed.

The fixed contacts are fitted with copper terminals allowing multiplebolt fixing.

Electrical closing is possible by using MWS (Motor Wound Storedcharge spring closing) mechanism. A mechanical indicator charged /free is provided to indicate the state of the charging spring.

‘ON / OFF’ mechanical indicators are available.

Two access flaps on doors are provided in IMS Air circuit breaker for :

- ‘ON/OFF’ operation.

- Racking operation (for withdrawing). These flaps can beindependently locked.

Operating Mechanism

IMS - Independent Manual Spring Closing

This mechanism is standard for all M-pact breakers. Operation is byinsertion of an operating handle into the operating sector provided anddepressing. This continous action will charge and release the closingsprings in one movement closing the breaker at the correct speedindependent of the operator. A direct mechanical coupling givesindication of ACB ‘ON’ or ‘OFF’.

MWS - Motor Wound Stored Charge Spring Closing

The motorised mechanism charges a closing spring upon circuitconnection. The spring charge may be electrically or manuallyreleased effecting closure of the circuit breaker. The closing spring isautomatically recharged ready for the next closing command. Anoperator can also manually charge the closing spring.

The spring condition ‘charged’ or ‘free’ is shown through an indicator.

Standard Operating Voltage for Motor

Voltage Power Consumption of Motor RPM220V/240V AC/DC 235W 2800

ACB Position Indicators

The draw-out mechanism has three breaker body positions and thebreaker can be locked in any of these positions. Visual indicatorsprovided show these three positions viz. SERVICE, TEST & ISOLATED.

Other indicators

Visual indicator showing the operation position viz, ‘ON/OFF’ andspring charging (for MWS only) ‘CHARGED/FREE’ are provided.

I M S closing mechanism

M W S closing mechanism

2


Breaker Electrical Connection Descriptionposition Main Circuit Control CircuitService Connected Connected Normal Service PositionTest Disconnected Connected Position for close open check

and control circuit operation tests.Isolated Disconnected Disconnected Breaker completely de-energised

The earth connection continue to be connected in all the above breaker position

A C B Position - connection details

Accessories

- Electrical Closing Release Coil

A solenoid coil is provided as standard on motor wound spring operating mechanism.Available coil ratings are shown below.

AC VOLTS 50 Hz 240 415DC VOLTS 110 220/250

- Auxiliary Switches

A positively driven auxiliary switch providing eight electrically separate ways is fitted to eachbreaker. The switch has a standard contact arrangement of 4 (normally open) and 4 (normallyclosed). The auxiliary switches are rated as given below :

Contact Rating Breaking Control Capacity of VoltageRated Current (amps.) 11A 440V AC at 0.3 pf 33A 110V DC 5A

- Carriage Position Indicator Switches

The carriage switch (2NO+INC) provides 3 electrically sepatate ways for test/service interlockoperation.

An additional switch may be added if doubling of contacts are required.

- LV Secondary Isolating Contacts

Spring Ioading sliding type moving and fixed isolating contacts are provided in each breaker.Contacts are of standard 6 way per block and are available for wiring to external circuits.Max. no. of blocks that can be mounted - 3 Nos. upto M 3032 - 5 Nos. on M 40

The following numbers of secondary contacts are required for operation of variousaccessories :

1. MWS Mechanism - 4 Ways

2. Shunt trip release - 2 Ways

3. Under-voltage Release - 2 Ways

4. Auxiliary Switch - 10 Ways

- Wiring

All units are supplied in wired condition. Standard wiring diagrams are available to facilitatewiring of accessories if ordered separately.

- Automatic Safety Shutters

All ACBs are fitted with automatic safety shutters for complete operator safety. These shuttersare independent in operation fully shielding the main contacts when the breaker is with-drawn.

- Arc Chutes

All Air Circuit Breakers are provided with arc chutes. Ensure these Arc Chutes are installed inthe breaker prior to commissioning.

- Finish

The cassette along with the front door are finished with stoved enamel light grey.

Electrical Closing Release Coil

Auxiliary Switches

Carriage Position Indicator Switches

LV Secondary Isolating Contacts

Automatic Safety Shutters

3


Operating Accessories (Electrical & Mechanical)

Electrical Accessories (Optional)

- Shunt Release

Shunt release can be provided as an option for local or remote electrically tripping the breaker.The shunt trip coil is short time rated and must be wired in series with normally open auxiliaryswitches.

DC Volts 24/30 110/125 200/220Watts 250 250 250

AC 50Hz Volts 240 415VA 680 680

- Under-voltage Release

The coil of this device is continuously energised and on dropping will trip the breaker. Voltageis calibrated for pick-up and drop-off in accordance with International Standards. Voltage

Range are as follows :

Burden 60VA 50Hz (after pick-up) Voltage AC 50 Hz Volts 415 240

Mechanical Accessories (Optional)- Mechanical Key Interlocks

A “Figure” type lock/key can be provided for interlocking a breaker with another breaker forprevention of parallel operation.

- Micro Switch (MS)

This can be fitted for external trip indication for built-in releases.

- Mechanical Anti-Pumping/Lock-out Device

A lock-out feature can be built-in optionally to prevent re-closing of breaker after tripping onfault. The breaker can be closed only after mechanical reset.

Shunt Release

Under-voltage Release

Mechanical Key Interlocks

Mechanical Anti-Pumping/Lock-out Device

4


Protective Devices

- Breakers without Releases.

These are available without integral releases. A shunt trip release is required for thesebreakers for operation through external relays and control supplies. If AC shunt trip is used foroperation from the main supplies, an under-voltage release is to be used as a back-up.

- Breakers with Releases

LMZ 2 - release

Inverse time overload protection with definite time over current protection and earthfaultprotection (IDMT characteristic & earthfault) device for low voltage Air Circuit Breakers.

This release is connected to a sensitive Magnetically Latched Spring Release (MLSR) devicecalled ‘PERA’ which trips the breaker.

Features :

• Inverse square time-current characteristics for closer thermal protection

• Self-powered trip device. No need for auxiliary supply

• Completely static device, hence no derating due to ambient temperature

• Test facility available

• Settings easily adjustable by push wheel switches

• No moving parts in the relay

• Simple & userfriendly single curve characteristics

• Maintenance free

• The 3-phase overcurrent element is designed to be used in single phase applications also

• Three phases adjusted simultaneously with one control

• High accuracy, reliability and repeatability

• Total integration and protection of circuit breaker in a single release

• Inbuilt earthfault protection

• A Micro switch can be fitted on PERA for trip/reset indication.

Relay Characteristics :

The push-wheel switches. Io, I >>, t >> & Ir are used to set the release. The number in the switchdisplays the set value ; pressing the ‘+’ button increases the value while pressing the ‘-’ buttonreduces it.

Over Current Protection :

Switch Ir sets the rated current of the release for inverse time over current characteristic. Therated current (Ir) can be set from 0.5 to 1 time the nominal CT current (In). Switch I>>determines the Short Time Delay (STD) pick-up from 3 to 9 times the rated current (Ir).

Definite Time Delay :There is a common definite time delay setting (t >>) for both over current and earthfaultprotection. Switch t>> sets the time delay from instantaneous (0) to 1 sec.

5


Earthfault :

Switch Io sets the rated current (Io) forearthfault pick-up, from 20% (0.2) to 70 %(0.7) of the nominal earthfault current (In).Earthfault characteristic has a definite timedelay of 0.2 sec + the time delay setting of(t>>).

Accuracy :

Inverse square time delay over currentcharacteristics has a non-trip value of 1.05and a positive trip value of 1.30 times thecurrent setting. The overall tolerance for allsettings is ± 15 %.

Nominal Current :

(For Release)

5A for both over current and earth-faultelements.

Test plug : Test plug is provided for testing the release for both ear thfault as well as over current protection.

LMZ 2 : OVERLOAD, SHORT CIRCUIT & EARTHFAULT PROTECTION ( The setting details )

l Rated current setting (Ir) : 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 time nominal current (In)l Overload delay time : 3 sec at 6 times the set current (Ir) as shown in the characteristic

curvel Short time delay pick-up current (I>>) : 3,4,5,6,8 and 9 times the rated current (Ir)l Short time delay (t>>) : Instantaneous, 0.2, 0.4, 0.6, 0.8 and 1.0 sec.l Eartfault current pickup setting (Io) : 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7 times earthfault nominal currnet (In)l Earthfault delay : 0.2 sec + Short time delay(t>>) setting

Time Current characteristicss (IDMT) of LMZ 2

Current (Multiples of Setting (Ir))

Trip

ping

Tim

e (S

econ

ds)

6


CTZM71 - release

A versatile static trip release Type CTZM integrally mounted is available for overcurrent andearthfault protection. This static trip is used in conjunction with ‘PERA’ a sensitive trippingdevice. ‘PERA’ is a magnetic latched stored energy trip release. This device is intended for usein CTZM static trip device. A micro switch can be fitted for trip/reset indication.

This release has the following adustments as shown in the characteristic curves.

- Overcurrent pick-up - 0.5, 0.6, 0.7, 0.8, 0.9, 1.00 times current rating.

- Inverse tripping time at - 4, 8, 12, 16, 20, 24 seconds at 6 times current setting.

- Short-time delay pick-up - 2, 3, 4, 5, 6, 8 times current setting.

- Shor-time delay - Instantaneous, 0.2, 0.4, 0.6, 0.8, 1.0 seconds.

- Earthfault pick-up - 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 times current rating.

- Earthfault delay - Instantaneous 0.1, 0.4, 0.9 seconds.

The characteristics can be arranged to arrive at full discrimination with :

- Relays with inverse and very inverse characteristics.

- Fuses with extreme inverse characteristics.

- Moulded case circuit breakers.

- Circuit breakers with high tolerance thermal and instantaneous combinations giving high

“kneepoint” characteristics.

The ‘Static’ trip release has the following features

• No moving parts

• Maximum flexibility of characteristics

• Free from maintenance

• Earthfault protection

• Close pick-up/drop-off ratio

• No ancillary equipment

• Three phases adjusted simultaneously with one control

• Characteristics unaffected by temperature variation

• High accuracy, reliability & repeatability

• Close overload protection

• Independent from auxiliary supplies

• Total integration and protection of circuit breaker

• Simple control selection

• Compliance with British and International standards.

7


Combined Inverse Time and Independent Overcurrent Characteristics

The graph shown exhibits the examples ofvarious characteristics possible with thesample adjustment to arrive at discrimina-tion of any circuit

Trip

ping

tim

e ( s

econ

ds )

Current ( multiples of setting Is ) CTZM

8


IDMT Characteristics

Current ( multiples of setting Is ) CTZM

Trip

ping

tim

e ( s

econ

ds )

9


Type M16, M20, M610 & M812 - 3 Pole

Type M25 and M1620 - 3 Pole

A Aperture for isolating

B Aperture for closing ( only for IMS ACBs )

C ACB position indicator

D Window for manual closing

E Window for manual charging

F Spring position indicator

PB Trip push button

INT Mechanical interlock ( if required )

only for MWS ACBs







PB Trip push button


only for MWS ACBs

4 slots at bottom flange to suit Ø8bolts for fixing the sub cubicle on tothe panel supporting structure


610 to drawout breaker

530 for overswing of door



Front view Side view

Lifting lug

Bottom view

Front view

Bottom view

Side view

Earth contactwith Ø 9 holes


Lifting lug

Dimensional Drawings in mm

10


Type M2025 & M3032 - 3 Pole

Type M40 & M3037 - 3 Pole







PB Trip push button


only for MWS ACBs







PB Trip push button


only for MWS ACBs







Side view

Lifting lug

Bottom view

3 nos 6.0 thick finger contacts with6.35 gap inbetween


Slots for Ø12 bolts

Front viewSide view Rear view

Bottom view

Lifting lug Earth contactwith Ø 9 holes

Ø 14 holes

Front view Rear view


11


Type M610, M16 & M20 - 4 Pole

Type M25 - 4 Pole







PB Trip push button


only for MWS ACBs







PB Trip push button


only for MWS ACBs







Side view

Bottom view

Front view

Side view

Bottom view

Front view

Lifting lug


Lifting lug



12


GE PowerControls

Technical Data

All M-pact circuit breakers comply with IS:2516 (part 1 & 2/Sec. 1) - 1985.

The following factor should be noted relative to the present requirement :

- Short circuit performance tests are carried out to Cat P2 of these specifications.

- M-Pact circuit breakers are certified for this duty regardless of whether incoming supplyconnections are to top or bottom terminals.

- All tests are carried out within the cassette thus guaranteeing the certification remainsvalid when the circuit breaker in its cassette is mounted within an enclosure.

M 610 M 16 M 20 M 25 M 3032 M 401. Rated Voltage Volts 415 415 415 415 415 4152. Thermal rating Amps 1000 1600 2000 2500 3200 40003. Rated insulation voltage Volts 660 660 660 660 660 6604. Making capacity kA peak 105 105 105 105 105 1055. Short circuit breaking

capacity at 415 Volts0.25 PF Duty cycleP2 category kA rms 50 50 50 50 50 50

6. Rated short timewithstand currentfor 1 sec. kA rms 50 50 50 50 50 50

7. Electr ical overloadperformance(25 operations) Amps 6000 9600 12000 15000 19200 24000

13

GE Power Controls

MPa

ct -

Ed 6

/99

GE Power Controls India Private Limited

H.O.

1106/6, Balaji ComplexA.M. Industrial EstateGuruvebhavipalya, Hosur RoadBangalore-560 068Ph : +91 (080) 572 5140/41/42Fax : +91 (080) 572 5146

REGIONAL OFFICES

NORTH

4, Community Centre,Panchsheel Park,New Delhi -110017Tel.: 011-6497807-10Fax : 011-6497812/13

South

Temple Towers,6th Floor, 476, Anna Salai,Nandanam,Chennai - 600035Tel.: 044-4329179/80, 4353776/769Fax : 044-4337325

East

Berger House,4th Floor, 129, Park Street,Calcutta - 700017Tel.: 033-2292156/2161007Fax : 033-2292918

West

Mahalakshmi Engg. Estate,Block No. 571,3rd Floor, Lady Jamsaedji,Ist Cross Road, Mahim,Mumbai - 400016Tel.: 022-4448570 Fax : 022-4442921

BRANCH OFFICES

Disman Business Centre3rd Floor, Samudra Annexe,Off C.G. Road,Navrangpura,Ahmedabad -380009Tel.: 079-6562412/6568968Fax : 079-6569456

Pan Asia Executive Center506, Citadel, R.C. Dutta Road,Windsor Plaza Complex,Alkapuri,Baroda - 390007Tel.: 0265-331578/359039Fax: 0265-331505/341316

1106/6, Balaji ComplexA.M. Industrial EstateGuruvebhavipalya, Hosur RoadBangalore-560 068Ph : +91 (080) 572 5140/41/42Fax : +91 (080) 572 5146

Duplex N0.10, Phase-IIIKedargouri Apartment ComplexLewis Road,Bhubaneswar -751002Tel.: 0674-430650

25/1, Motilal Nehru Nagar (West)SBI Colony,Bhilai -490020Tel.: 0788-394876

No-3, First floor, Venkatesa NagarKoundamapalayam,Coimbatore -641030Tel.: 0422-446087Fax : 0422-457644

Ganesh Bhavan2nd Floor, Rajghar RoadGuwahati-781 007Tel.: 0361-452481Fax: 0361-459060 (PP)

838, Industry House,15 AB Road,Indore- 452001Tel.: 0731-266838, 267053/54Fax.: 0731-267051, 52

C/o. B.P. Agrawal & Co448, 4th Floor,Ganapati Plaza,M.I. Road,Jaipur- 302 001Tel : 368872, 368040, 388675

Eastern Side, Ground floor10, Park RoadJamshedpur -831001Fax : 0657-424056

Mayur Business Center & MotelChittur RoadPullepady JunctionKochi -682035Tel.: 0484-364139Fax : 0484-354262

101,ACE Business Center19, Vidhan Sabha MargLucknow -226001TeleFax : 0522-237564/566

Saptak Plaza, Ist Floor18, Shivaji NagarNorth Ambazari RoadNagpur -440010Tel.: 0712-558179/80Fax : 0712-552118

41/14, Office ClubSwaroop ComplexKarve Road,Pune -411004Tel.: 020-332074/349335Fax : 020-363978

Second Floor, 5-4-187/3&4/10Pearn “N” Necklace complexKarbala Maidan, M.G.RoadSecunderabad -500003Tel.: 040-6211264

GE Power Controls India Private Limited1106/6, Balaji ComplexA.M. Industrial EstateGuruvebhavipalya, Hosur RoadBangalore-560 068Ph : +91 (080) 572 5140, 41, 42Fax : +91 (080) 572 4947

Mpact Brochure

Documents