ACB masterpact (Circuit Breakers)

ACB masterpact (Circuit Breakers) SM6 switchgear (Circuit Breakers) MCB MCCB (Circuit Breakers) Compact 80 1250 (Circuit Breakers) ACB masterpact (Circuit Breakers) .............................................................................

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front face

1 opening push-button (O)

2 closing push-button (I)

3 keylock for "connected",

"disconnected" or "test" position

4 door interlock

5 stored-energy-mechanism charging

handle

6 operations counter

7 "open" position keylock

8 racking handle storage

9 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" position

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 LVswitchboards (incoming units, main andsecondary outgoers) Masterpact is a

complete range offering a large selection of performance 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,

c merchant-marine and military versions

Masterpact circuit breakers comply with all major international standards and meet

T2 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 to

6300 A;

c DC circuit breakers:

v common height and length from 1000 to

8000 A for operational voltages of up to 500

V DC,

v common height and length from 1000 to

4000 A for operational voltages greater than

test

+ S – – T +

T F

Ih

1000 250 4

R

xIr test

O

push OFF

connected test disconnected

chargeddischarged

4

3

8

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drawout version

1 arc chute cover

2 auxiliary terminal shield

3 auxiliaries connection block

4 fixed chassis

5 safety shutters

7 remote control voltage release

8 motor for electrical charging of

stored energy mechanism

9 control unit (AC system)

4

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Automatic source-changeover controller

Fixed circuit breaker

τtr

%Ir

.88 9 92

1 8 85

xIo

60 120

480 15

at 1.5Ir

Im tm

10 1.5 2

xIr

.3 3

Im fault tm I fault Ih

i test

250A

.3 2 2

on I2t off

.3

I

8 12 19

1 8 85

safety and reliability

c reduced, simple maintenance (maincontacts easily accessible, with wearindication 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 operating mechanism

Masterpact circuit breakers are operated via

a stored energy mechanism forinstantaneous opening and closing.The mechanism is charged either manually

or electrically Closing and openingoperations can be initiated either from thelocal pushbuttons on the circuit breaker frontface, or by remote control

common auxiliaries from 800 A to 6300 AAuxiliaries

c accessible from the front, mounted in aseparate compartment insulated from powercircuits;

c secured by a single screw;

c adjustment-free;

c can be fitted on site

c 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 or

3 mechanically (rod assembly) interlockedcircuit breakers, adaptable to varioussource-changeover configurations;

v complete assembly including

2 mechanically (rod assembly) interlockedcircuit breakers and an automatic source-changeover controller, adaptable to varioussource-changeover configurations Readyfor connection

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

c 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 with

a protection system that instantaneouslyopens the circuit breaker in the event ofclosure under fault conditions

c Earthing switch

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

c 1000 V AC circuit breakers

voltage releases accessible from the front

total phase separation double insulation

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Drawout Masterpact DC circuit breaker

Fixed Masterpact DC circuit breaker

Masterpact DC circuit breakers are available

in fixed and drawout versions They benefitfrom 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 with

an adjustable, magnetic trip unit (DINA);

c a switch (unprotected) version

note: up to 125 V DC, the devices in the AC

range (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

Masterpact 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

Accessories

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

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Masterpact: presentation

Masterpact circuit breakers are the product

of Merlin Gerin’s vast experience in the field

of power circuit breakers They incorporateall 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 rationally designed range.

c built-in measurement functions in thecontrol units;

c auxiliaries are the same for the entirerange and may be easily implemented (only

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 circuit breakers can replace most existing circuit breakers.

continuity of serviceMasterpact circuit breakers are designed with continuity of service in mind The result is:

c total time discrimination on the N1 and H1circuit breakers and maximum discrimination

on H2 circuit breakers;

c factory pre-setting of Masterpact circuitbreakers which never require any periodicmaintenance;

c high electrical endurance: 10 000 cycles at

1600 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 optionalfunction 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 Masterpact circuit breakers provides for:

v limitation of external disturbances

Positive contact indication

The position indicator cannot indicate

«open» unless the poles are effectivelyseparated by the required distance

The circuit breakers automatically open during racking in and out.

reliability

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

c the Masterpact circuit-breaker factory iscertified ISO 9002;

c the design of Masterpact circuit breakers

is modular with delayed differentiation(highest possible number of common parts

on all models) The result is shorter deliverytimes and enhanced reliability

2500 A Masterpact circuit breaker

Top: front connection

Bottom: rear vertical connection

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Icu 100kA 85kA

Ics 100kA 85kA

Icw 75kA 1s

IEC 947-2

general characteristics

Standardised characteristics indicated on

the rating plate:

Ui: rated insulation voltage

Ue: rated operational voltage

Icu: ultimate breaking capacity, for various

values of the rated operational voltage Ue

Ics: service breaking capacity

Icw: short-time withstand current

: suitable for isolation

Masterpact circuit breakers comply with allthe major international standards:

c International standard IEC 947-2;

c North American standards (please consultus):

UL 489, ANSI C37-50, CSA C22-2,NEMA AB1 et SG3;

c Japanese standards: JIS 160 and C 8372

They also comply with the following nationalstandards:

Circuit breakers are subjected to tests thatare more representative of real operatingconditions

IEC 947-2 also clarifies the notion ofbreaking capacity

c Icu : the ultimate breaking capacity, which

must be greater than or equal to the 3-phaseshort-circuit current at the point of

installation of the circuit breaker, a valueunlikely to be reached under real conditions;

c Ics : the service breaking capacity,

generally expressed as a percentage of theultimate breaking capacity (25, 50, 75 or

100 % of Icu) It corresponds to a circuit current that is more likely to bereached under real conditions The circuitbreaker must continue to operate normallyafter having interrupted a current equal toIcs several times;

short-c Icw : short-time withstand current for

circuit breakers belonging to category B(category B refers to circuit breakers withtime discrimination and category A to thosewithout time discrimination)

Furthermore, IEC 947-2 takes into accountrecent technological advances:

c suitability for isolation recognised forcircuit breakers having passed specialelectrical and mechanical tests;

c industrial earth-fault circuit breakerscovered by an appendix;

c definition of tests designed to ensurecoordination between two circuit breakers

conformity with standards

tropicalisation

As standard, Masterpact circuit breakerscomply with NF C 63-100 standard level 2conditions (95 % relative humidity at 45 °C

or 80 % at 55 °C, hot and humid climateconditions) They also comply with thefollowing standards:

c IEC 68-2-30 damp heat;

c IEC 68-2-2 dry heat;

c IEC 68-2-11 salt spray;

c IEC 68-2-1 low temperatures during

storage

Corrosive atmospheres: Special grease orother surface coatings available (pleaseconsult us)

pollution degree

Masterpact circuit breakers are certified foroperation in pollution degree IV

environments as defined byIEC standard 947 (industrial environments)

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positive contact indication

All Masterpact circuit breakers offer positivecontact indication The toggle positionrigorously reflects the position of the maincontacts It can indicate the "OFF" positiononly if the contacts are effectively open and

a suitable distance apart

degree of protection

(as defined by IEC 529)

circuit breaker installed in a cabinet with access IP 40-5

to controls through a door cut-out

circuit breaker installed in a cabinet behind a door with IP 54-9

a cut-out fitted with a sealed, transparent cover

installation

Masterpact circuit breakers may be installed

on horizontal metal surfaces or on rails

They are secured by four points accessible

at the bottom of the chassis (drawoutversions) or on either side of the circuitbreaker (fixed versions) A single doorcut-out is required for the entire range andprovides access to Masterpact controls(see the description on page 2)

This characteristic considerably increasesthe dependability of the circuit breaker

The conditions specified by IEC 947-2 forthis function are:

c positive contact indication;

c impulse withstand: 8 kV at sea level;

c very low leakage current, checked on newcircuit breakers and on circuit breakerssubjected to tests representative of the end

of service life

Moreover Masterpact circuit breakers have adouble-insulation front face (i.e a class IIdevice) allowing control from the outside

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circuit breaker selection

(1) Defined for a power factor of 0.25 if 20 < kA rms

(2) Closing at 6 x Ie and opening at 0.17 x Un.

(3) For control unit STR 68 U, the minimum rating

Masterpact circuit breakersnumber of poles

electrical characteristics as per IEC 947-2 and EN 60947-2

rating of 4th pole (A) rated insulation voltage (V) Ui rated impulse withstand voltage (V) Uimp rated operational voltage (V) Ue AC 50/60 Hz

type of circuit breakerultimate breaking capacity (1) Icu AC 50/60 Hz 220/415 V

500/690 V

3 s

440 V500/690 V

electrodynamic withstand (kA peak) utilisation category

suitability for isolation break time

closing time endurance (C-O cycles) x 1000 mechanical with maintenance

no maintenanceelectrical no maintenance 440 V - In

690 V - In

motor control (AC3-947-4) (2) 690 V

electrical characteristics as per standard Nema AB1

600 V

protection (see following pages)

sensor ratings (A) (see page 12)

selective STR 38 Suniversal STR 58 U

operation counter (CDM)installation and connection accessorieslocking by padlock or keylock/mismatch protection safety shutters (VO)

interphase barriers (EIP) partitioning fixture (AC) arc-chute cover (CC) terminal-block cover (CB) door frame (CDP)

Masterpact M16 H1

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circuit breaker selection (cont.)

Masterpact circuit breakersnumber of poles

500/690 V

3 s

440 V500/690 V

electrodynamic withstand (kA peak) utilisation category

suitability for isolation break time

closing time endurance (C-O cycles) x 1000 mechanical with maintenance

690 V - In

electrical characteristics as per standard Nema AB1

600 V

interphase barriers (EIP) partitioning fixture (AC) arc-chute cover (CC) terminal-block cover (CB) door frame (CDP)

Masterpact M50 H1

In is 400 A

(4) 83% if Ue i 440 V

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circuit breaker selection (cont.)

Masterpact 1000 V AC

Masterpact 1000 V AC circuit breakersnumber of poles

500/690 V

1000 V

3 s

440 V500/690 V

690 V - In

interphase barriers (EIP) partitioning fixture (AC) arc-chute cover (CC) (as standard on the 1000 V version) terminal-block cover (CB)

door frame (CDP) transparent cover (CCP)

Masterpact M20 H1 1000 V

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Masterpact switch-disconnectorsnumber of poles

interphase barriers (EIP) partitioning fixture (AC) arc-chute cover (CC) terminal-block cover (CB) door frame (CDP) transparent cover (CCP)

Masterpact M10 NI

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switch-disconnectors (cont.)

Masterpact switch-disconnectorsnumber of poles

interphase barriers (EIP) partitioning fixture (AC) arc-chute cover (CC) terminal-block cover (CB) door frame (CDP) transparent cover (CCP)

Masterpact M50 HI

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dimensions and weights

Masterpact circuit breakers and switch-disconnectors type

dimensions and weights

The table above indicates:

c all the available sensor ratings In;

c the limits of the long time Ir settings

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STR 18 M STR 28 D

STR 38 S STR 58 U STR 68 U

control unit selection

Masterpact M08 to M63 circuit breakers are

equipped with microprocessor-based

electronic control units

All the protection functions are powered by

the AC system and no auxiliary power

supply is required The same is true for most

of the complementary functions

Each control unit of the Masterpact range

corresponds to a certain type of application

(instantaneous, distribution, selective,

universal)

All the STR control units measure the true

rms value of the current and are therefore

not affected by harmonics that may be

present on the system

current settings (A)

2 5

3

4 5

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2 ammeter digital display.

3 bar graph indicating load level (% Ir)

4 maximum protection rating

5-6 long-time current setting as a function of:

0.63 0.8

1

3

4 5 6 8 10 1.5 2

2

3

4 11 5

6 7

9 8

10 11

2 ammeter digital display

5 overcurrent indicator LED

12 earth fault pick-up.

13 earth fault delay.

14 LEDs indicating tripping on long-time,

short-time or earth fault

15 test connector.

16 holes for sealable cover plate screws.

17 battery supplying backup power for fault

indication

18 fault indication reset and/or battery test.

19 re-indication of last fault.

3 5

8 10 1.5 2 3 4 3 2 1 0 1

max off

400

500 600 800 1000 250 3 4 4 3 2 1

13 14

19

18 17 10

7 6

c self-monitoring (internal overheating);

c indication of type of fault (F)

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control unit selection (cont.)

105

.9 92 95 98 1 8 85

tr

at 1.5Ir

xIr on I2t off 3

5

8 10 1.5 2 3 4 3 2 1 0 1

I

xInoff

19 12 8

.4 2

.1

xIr 86

.9 93 95 98 1 8 85 7 8 85 9 95 1 5 xIr

15 14

17 19

20 23

5 4 3

2 2

4 local fault indication and indication reset

5 selection and indication of protectionparameter to be set

6 selection and indication of loadmonitoring parameters

7 adjustment and saving of parametersettings

8 holes for sealable cover plate screws

ST pick-up(Im)

ST time delay(tm)instantaneouspick-up (I)earth fault

time delay (th)

earth faultpick-up (Ih)

LT time delay(tr)

c self-monitoring (internal overheating);

c fault type indication (F);

c segregated alarm switch for selectedfault type (V);

c zone selective interlocking (Z);

3 ammeter digital display

6 overcurrent indicator LED

14 earth fault pick-up.

15 earth fault delay.

21 holes for sealable cover plate screws.

22 fault indication reset and/or battery test.

23 re-indication of last fault.

24 LEDs indicating tripping on long-time,

short-time or earth fault

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options for STR control units

zone selective interlocking

Two types of earth protection are availablefor Masterpact:

c residual current type (T): the control unitcalculates the vector sum of the phase andneutral (if distributed) currents;

c source ground return type (W): the controlunit acts directly on the signal received from

an external current transformer installed onthe source earthing circuit

earth fault curves for the STR 58

load-shedding or load-reconnectionpurposes

indication and

measurement

c ammeter (I): a digital display

continuously indicates the current of thephase with the greatest load (Imax) Bypressing a scroll button, it is also possible todisplay successively the readings of I1, I2,I3, Ineutral and Ih

In addition, three bargraphs provide animmediate visual indication of the load oneach of the three phases

A number of circuit breakers areinterconnected one after another by a pilot-wire In the event of a short-time or earthfault, the control unit applies the set timedelay only if it receives a signal from adownstream circuit breaker If not, it tripsinstantaneously (tripping time as 0.1 short-time setting) In this way, the fault is clearedrapidly by the nearest circuit breaker Thethermal stresses in the installation areminimised while maintaining timediscrimination throughout the entire

installation

Opto-electronic outputs

The use of opto-transistors ensures totalisolation between the internal circuits of thecontrol unit and the circuits wired by theuser

Other information that can be transmittedincludes the value of the interrupted current,the state of the thermal memory and themaintenance indications

c indication of type of fault (F);

c segregated alarm switch for selected fault type (V), wired in parallel with the

opening button (MX), it disables circuitbreaker closing for the selected type of fault

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STR 18 M to STR 58 U

control unittype of circuit breakerbasic protectionlong time protection LT

current setting (Ir) as a function of Io and Ir Io = In x

settings tripping between 1.05 and 1.20 x Ir Ir = Io x

pick-up (Im) adjustable by Im setting Im = Ir x

tm setting with I2t ONmax overcurrent time before tripping (ms)max break time (ms)

instantaneous protection I

pick-up settingsetting rangeaccuracyOFF switch on front face

basic functionsfault indication

for tripping on a fault indicator button on front face

fault trip alarm contact (SDE)for LT setting overrun LED (lights up at 0.9 Ir and flashes at 1.05 Ir)

LT overrun alarm contact (optional)self-powered

optional functions

current readings with an accuracy of ± 1.5 % (1) (3)

bargraph indication of current levels with a resolution of 10 %self-powered

earth fault protection: residual current (T) or source ground return (W) type on request

pick-up adjustable by Ih setting Ih = In x

max overcurrent time before tripping (ms)max break time (ms)

indication of type of fault (F) (LT - CT/Inst - Earth) by LEDs on front face

with external power supply by AD module

segregated alarm switch for selected fault type (V) (LT - CT/Inst - Earth)

output via relay contactpower supply by AD module

zone selective interlocking (Z)

by opto-electronic contact on ST and earth (T/W) fault

communication (COM)

2 outputs for data transmission to Digipact module

alarms: Ir warning, fault type, self-monitoringload monitoring thresholds

current values I1, I2, I3, INpower supply by AD module

(4) 0.2 x In to 1200 A without external power

supply or 0.1 x In with external power supply

(5) Accuracy with respect to the long time LT

protection

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I1, I2, I3, IN, Imax (6) I1, I2, I3, IN, Ih, Imax (6) I1, I2, I3, IN, Ih, Imax (6)

0.8 to 1 (8 settings) ± 1 % (5)

0.5 x tr0.25 x tr

c

fixed at 10 s

cccccc

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STR 68 U

presentationThe STR 68 U control unit offers

measurement, supervision and energymanagement functions

Microprocessor technology, liquid crystaldisplay and function keys ensure highaccuracy and easy adjustment

The standard STR 68 U control unit providesthe following:

c universal protection;

c ammeter function;

c indication of fault type;

c values of interrupted currents;

c maintenance indicator;

c integrated test

The following options can be added:

c power measurement module (P);

c "earth fault" protection module;

c control and indication modules (M) with orwithout transmission to a supervisor

Certain M modules can provide loadmonitoring or zone selective interlocking forearth fault protection

The STR 68 control unit provides:

c overload protection, with long time

v instantaneous, with the INST function thatcan be disabled by the user;

protection

c "earth" protection with time

discrimination or zone selective interlocking.The protection is of the residual current type(or source ground return type on request)

c test

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optional functions c power measurement (P);

c indication and control (M)

Thirty-one different modules offer variouscombinations of functions including:

c "earth fault" protection (T)

Of the residual current type (or sourceground return type on request), it is possible

to obtain zone selective interlocking bycombining the T option with the appropriate

M option

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STR 68 U

basic protection

max overcurrent time before tripping (ms) 60 140 230 350

basic functions

fault indication

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optional functions

earth fault protection: residual current (T) or source ground return (W) type on request c (zone selective interlocking with option M)

indication and control (M): 31 modules (1 per control unit) providing the following combinations: c

trip indications

transmission

voltages V1N, V2N, V3N

instantaneous active power and energy: P EP - 9000 to 9000 kW 0 to 9999 MWh ± 5 %instantaneous reactive power and energy: Q EQ - 9000 to 9000 kVar 0 to 9999 MVahr ± 5 %

(1) Depending on the equipment, the "self-monitoring" alarm signal may or may not trip the circuit breaker, see "service continuity" option on the order form.

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option m selection Option M can be incorporated in control unit

STR68U to provide the following functions:

c RS485 data transmission at 9600 bauds toJBUS protocol;

c remote signal via opto-electronic output;

c zone selective interlocking for earth faultprotection

The following table indicates the functions ofthe different versions, designated m01 tom31

For terminal wiring see page xxxx

without data transmission

remoting

load monitoring and control

with data transmission

data transmission

remoting

control unit selection

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Basic functions: long time LT,

short time ST, instantaneous INST

overcurrent settings

1 : LT setting Ir (long time)

2 : LT time delay tr (long time)

3 : ST pick-up Im ( short time)

4 : ST time delay tm ( short time)

5 : INST pick-up I (instantaneous)

earth fault protection settingsT1 : earth fault pick-up IhT2 : earth fault time delay th

load monitoring and control settings

Ic1 pick-up (load limit)

Ic2 pick-up (load limit)

load monitoring and control settingsIc1 pick-up (load limit)

Ic2 pick-up (load reconnection)

Operation with 1 load limit and 1 load reconnection pick-up

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control unit accessories

battery module (PIL)

Complementary to the local indication of thefaults (F option for STR 38 and STR 58 tripunits), the battery module avoids the needfor any external power supply to save frontface indications

This module is equipped with a button for activation, of fault indications that have beende-activated by the battery power-savingfeature A test button is used to check thebattery status

re-interface module ET44

Compulsory with the data transmissionoption on the STR 68 trip unit, the ET44interface module allows:

c setting of the transmission speed;

c definition of the address of the breaker(which will not be affected by any drawoutbreaker manipulation);

c the direct remote control of the breaker,thanks to two outputs directly controlledthrough the data transmission

Installation: on vertical plate or symmetricalrail

Power supply: 24 V DC with galvanicisolation, or AD type power module

power supply module (AD)

These modules can be used to powercontrol unit complementary functions whichcannot be self-powered by the built-incurrent transformers:

c STR 38 and STR 58: fault type indication(F);

c STR 58: segregated alarm switch (V);

c STR 58: communication option (COM);

c STR 28, STR 38, STR 58: ammeter (I) forload less than 20% of In

c STR 68: indication and saving of

Available voltages:

c AC 50/60 Hz: 110 V, 220 V or 380 V(–20 %; +15 %) (consumption 10 VA);

c DC : 24/30 V, 48/60 V, 125 V (±20 %)(consumption 10 W)

Installation: on vertical plate or symmetricalrail

battery module (BAT)

Providing a complement to the AD module,the battery module provides backup powerfor display indications and maintenanceindicator data in the event of a power failure

Float connected between the power supplyand the control unit, it ensures a backuptime of approximately:

c 12 h with STR 38 and STR 58 controlunits;

c 1.5 h with STR 68 control unit

Installation: on vertical plate or symmetricalrail (ambient temperature from: 0°C to+50°C)

mini test kit (BU)

This self-contained portable unit is used tocheck STR 18 M to STR 58 U control unitsoperations and breaker tripping

Power supply: five 9 V alkaline batteries (notsupplied)

This test kit is common to the Masterpact,Compact NS, C, CM ranges

portable test kit for STR 18

to STR 58

The portable test kit is used:

c for control unit STR 68, to power, checkand carry out adjustments and tests on thebreaker/control unit assembly (control unitwithout auxiliary power supply connected);

c for other control units, to check theoperation of the trip unit by measuring theactual trip time:

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Masterpact: functions and characteristics

auxiliary power supplies

The protection functions and most of the

options available for the STR control units

are self-powered An auxiliary power supply

is nevertheless required for certain uses

(1) Not recommended: possible with a 24 V DC source, class 2, 5 Watt, ripple factor < 10%.

(2) Display will in this case be "❊❊❊❊" Auxiliary supply allows to save maximeter information

(3) Ih pick-ups for which protection is not self-powered are printed in red on the trip unit front face.

self-powered auxiliary power supply

connection modulesSTR 28 / 58

or single phase load

protection : LT, ST, INST, T, W yes

other functions : see drawings page 71

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electrical operating mechanism

Added to the manual charging mechanism,

a motor charges and automaticallyrecharges the stored-energy spring uponbreaker closing making possible fastO-C-O cycles

Opening and closing operations areinstantaneous

The manual mechanism remains availablefor emergency use

The electrical operating mechanism includes:

c the gear motor(MCH);

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operation counter (CDM)

With gear-motor option only The operationcounter is read from the front and gives thetotal number of breaker operating cycles

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auxiliaries (cont.)

Shunt release (MX)

This release instantaneously opens thebreaker when energised The supply can bemaintained or automatically disconnected Inthe latter case, the user can series connect

an internal auxiliary contact (OF)

releases

Two types of voltage releases can be usedfor remote opening of Masterpact circuitbreakers

Undervoltage releases

c instantaneous (MN)This release instantaneously opens thebreaker when its supply voltage drops below

a value between 35 % and 70 % of its ratedvoltage

If the release is not energised, the breakercannot be closed (either manually ofelectrically) Any attempt to close will have

no effect on the main contacts

Closing is possible when the release voltagereaches 85 % of its rated value

c time delayed (MNR)

To prevent the breaker tripping in the event

of transient voltage dips, this release has abuilt-in time delay

A special version, available on request,allows instantaneous tripping (from amushroom-head emergency off button) bythe wiring of an external contact

Note: anti-pumping function:

After the breaker has been opened, either byfault trip or by manual or electrical operation,anti-pumping is provided by requiringcancellation of the initial closing commandbefore reclosure of the breaker is possible.The closing release is supplied on requestwith the manual operating mechanism

(1) 500/525 V AC not available for MNR.

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