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front face1 opening push-button (O)2 closing push-button (I)3 keylock for "connected",

"disconnected" or "test" position4 door interlock5 stored-energy-mechanism charging

handle6 operations counter7 "open" position keylock8 racking handle storage9 functional position indicator:

"connected", "test" and "disconnected"10 controls on fixed chassis (accessible

with cubicle door closed)11 padlocking facilities for "connected",

"disconnected" or "test" position12 stored-energy-mechanism status

indicator

c "charged"

c "discharged"

13 main-contact position indicator

c "OFF" (O);

 c "ON" (I).

14 fault-trip indicator/breaker reset button

LV circuit-breaker: blue figuresEnclosure: red figures

Masterpact: presentation

Masterpact circuit breakers are used toprotect and control low-voltage distributionsystems. They may be installed in main LV

switchboards (incoming units, main andsecondary outgoers). Masterpact is acomplete range offering a large selection ofperformance levels:c ratings from 800 to 6300 A AC,from 1000 to 8000 A DC;c breaking capacity from 40 to 150 kA rms;c operational voltages 690 V AC,1000 V DC.

2 Merlin Gerin

Many versions

c 3 or 4 poles;c fixed or drawout versions;c

 current-limiting version up to 2500 A;c wide range of control units offeringmultiple functions.

Circuit breakers designed for allapplications

c 1000 V AC version;c DC version;c anti-corrosion version;c source-changeover version;c merchant-marine and military versions.Masterpact circuit breakers comply with allmajor international standards and meetT2 tropicalisation criteria.

Reduced dimensions

c AC circuit breakers:v a single frame size from 800 to 3200 A,v common height and depth from 800 to6300 A;c DC circuit breakers:v common height and length from 1000 to8000 A for operational voltages of up to 500V DC,v common height and length from 1000 to4000 A for operational voltages greater than500 V DC.

push to reset

I

I1 I2 I3

90%

50%

20%

STR 58 UE

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on  I2t

off

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Ir fa ult

tr

Im fault

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fa ultIh

th

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test

+ S –

 – T +

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400

500  600

800

1000

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push OFF

connected

test

disconnected

O OFFdischarged

I

push ON

MERLIN GERIN

M32 H1masterpact

IEC 947-2

00000

Ui

Ue

Icu

Ics

Icw

1000V

380 /440V

100kA

100kA

75kA 1s

50 /60Hz

480 /690V

85kA

85kA

M63 M50 M40 M08 à M32

charged

discharged

O OFF

I ON

      E      2      8      7      9      1

      E      2      8      7      6      1

      E      2      8      7      6      0

M08 to M32

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  9  2  8  P  C

11

14

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1

6

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39 108

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drawout version1 arc chute cover2 auxiliary terminal shield3 auxiliaries connection block4 fixed chassis5 safety shutters6 arc chute7 remote control voltage release8 motor for electrical charging of

stored energy mechanism9 control unit (AC system)

10 front cover

1

2

3

6

7

8

10

9

5

4

      0      1      5      1      5      9

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Automatic source-changeover controller

Fixed circuit breaker

50%

20%

STR 58 U

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Ir tr

0.8

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on  I2t off

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tm

I

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th

i

test

+   –

 –  +

T

R

test

Ih 1200A Max th

400500   600

800

1000

1200250

320

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min.

norm

overcurrent

ground

isolation renforcéeclasse II

séparation totaleentre chaque phase

déclencheurs voltmétriquesaccessibles à l'avant

Masterpact: presentation

safety and reliabilityc reduced, simple maintenance (maincontacts easily accessible, with wear

indication feature);c double insulation from the front face;c positive contact indication;c auxiliary devices can be fitted on sitewithout adjustment;c fewer parts than conventional ranges (by afactor of 5-10);c a trip interlock ensures that the circuitbreaker is open during connection anddisconnection;c connection to top or bottom terminals;c fully tropicalised as standard.

stored energy operatingmechanismMasterpact circuit breakers are operated viaa stored energy mechanism forinstantaneous opening and closing.The mechanism is charged either manuallyor electrically. Closing and openingoperations can be initiated either from thelocal pushbuttons on the circuit breaker frontface, or by remote control.

common auxiliariesfrom 800 A to 6300 AAuxiliariesc accessible from the front, mounted in aseparate compartment insulated from power

circuits;c secured by a single screw;c adjustment-free;c can be fitted on site.

ccccc Source changeover system

Four solutions are available:v mechanical interlocking for 2 or 3 circuitbreakers, adaptable to various source-changeover configurations;v automatic source-changeover controller,easy to implement on any two suitablyequipped circuit breakers (electricallycharged operating mechanism, etc.) (for 3circuit breakers, consult us);

v complete assembly including 2 or3 mechanically (rod assembly) interlockedcircuit breakers, adaptable to varioussource-changeover configurations;v complete assembly including2 mechanically (rod assembly) interlockedcircuit breakers and an automatic source-changeover controller, adaptable to varioussource-changeover configurations. Readyfor connection.

other possibilities   ccccc Fixed circuit breaker

The fixed circuit breaker is derived from themoving part of the drawout circuit breaker byadding a fixing bracket on each side.

ccccc Switch version

The switch (unprotected) version is deriveddirectly from the standard circuit breaker, butdoes not implement a control unit (or themagnetic trip units used with the DC circuitbreakers). Available models are:

v standard: type HI and NI;v high performance: type HF, equipped witha protection system that instantaneouslyopens the circuit breaker in the event ofclosure under fault conditions.

ccccc Earthing switchA special short-circuit and earthing switch isavailable on request for the M08 to M32Hdrawout types, 3 or 4 poles. Please consultus.

ccccc 1000 V AC circuit breakers

      E      2      9      4      9      0

voltage releasesaccessible from thefront

total phaseseparation

double insulation

     0     3     5     9     2     9

      0      5      3      0      6      1

      0      5      3      0      6      0

      0      5      3      0      5      8

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Drawout Masterpact DC circuit breaker

Fixed Masterpact DC circuit breaker

device identificationM 20 H1

breaking capacity;

c N1: standard;c H1: H2: high performance;c L1: current limiting;c DC: direct current.

ratingc rated current / 100.

familyc Masterpact: LV power aircircuit breaker.

DC circuit breakersMasterpact DC circuit breakers are availablein fixed and drawout versions. They benefit

from the AC range technology andadvantages.c 5 available ratings from 1000 to 8000 A;c 2 breaking capacities, 100 kA at 500 V,50 kA at 750 and 1000 V;c a circuit-breaker version offeringinstantaneous short-circuit protection withan adjustable, magnetic trip unit (DINA);c a switch (unprotected) version.note: up to 125 V DC, the devices in the ACrange (M08 to M63) may be used only in theswitch version, in which case a three-pole,type HI device should be used, with:c 1 pole for the positive polarity;c 1 pole for the negative polarity;

c 1 pole not used.

Auxiliaries

All the auxiliaries designed for theMasterpact AC circuit breakers may be used

on the DC versions, with the exception of theposition switches, indicating the connected(CE), disconnected (CD) and test (CT)positions.Auxiliary connections are made via one ortwo manually disconnectable plugs thatremain accessible from the front.

AccessoriesStandard Masterpact DC range equipmentincludes an arc-chute cover (CC) and, ondrawout versions, safety shutters (VO).Interphase barriers (EIP) are not availablefor the DC range.

      8      6      0      9      4

      8      6      0      9      6

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Masterpact: presentation

Masterpact circuit breakers are the productof Merlin Gerin’s vast experience in the fieldof power circuit breakers. They incorporate

all the qualities of traditional air circuitbreakers while drawing on certain of theadvantages specific to moulded-case circuitbreakers. In particular, they require nopreventive maintenance.

ease of installationMasterpact is a complete and rationallydesigned range.c 10 ratings;c 4 breaking-capacity levels;c 6 control units;c a complete range of auxiliaries andaccessories;c numerous versions (three and four-pole

devices, fixed and drawout versions, etc.).Masterpact circuit breakers are easy toincorporate in switchboards.

c a single frame size from 800 to 3200 A,thus making for standardised columns;c an upper safety clearance equal to zerodue to the arc-chute cover, on both the fixedand drawout versions;c built-in measurement functions in thecontrol units;c auxiliaries are the same for the entirerange and may be easily implemented (onlya screwdriver is required).

Masterpact circuit breakers are easy toconnect to the main distribution system.

c all types of connections are available(horizontal and vertical terminals, front andmixed connections);c connections are possible with bars of anythickness;c connection to the input power source ispossible on the upper or lower terminals ofthe circuit breakers.

Due to their small size, Masterpact circuitbreakers can replace most existingcircuit breakers.

continuity of serviceMasterpact circuit breakers are designedwith continuity of service in mind. The

result is:c total time discrimination on the N1 and H1circuit breakers and maximum discriminationon H2 circuit breakers;c factory pre-setting of Masterpact circuitbreakers which never require any periodicmaintenance;c high electrical endurance: 10 000 cycles at1600 A and 30 cycles at 50 kA, withoutmaintenance;c preventive indications: load-sheddingindication switch, long-time thresholdoverrun alarm, etc.;c easy access to the main contacts fittedwith mechanical wear indicators. An optional

function on the STR68 control unit is theremote indication of contact wear, thusmaking possible continuous monitoring ofcircuit breakers during their service life.

operating safetyThe insulating casing of Masterpactcircuit breakers provides for:c user safety:v double insulation on the front face(class II),v auxiliary circuits in a compartmentinsulated from the power circuits;c switchboard safety when the circuitbreaker is in the open position:

v each pole is effectively isolated in its ownhousing,v limitation of external disturbances.Positive contact indicationThe position indicator cannot indicate«open» unless the poles are effectivelyseparated by the required distance.The circuit breakers automatically openduring racking in and out.

reliabilityc Masterpact circuit breakers comprise tentimes fewer parts than traditional devices.They are easier to produce and more

reliable.c the Masterpact circuit-breaker factory iscertified ISO 9002;c the design of Masterpact circuit breakersis modular with delayed differentiation(highest possible number of common partson all models). The result is shorter deliverytimes and enhanced reliability.

 ,

   0   3   6   6   3   4

  0  2  5  1  7  9

2500 A Masterpact circuit breaker

Top: horizontal terminals

Bottom: vertical terminals