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Instruction Bulletin48049-107-01

12/2001Cedar Rapids, IA, USA

ECN K455

Control Unit Replacement Instructions for MASTERPACT ® Circuit BreakerRetain for future use.

© 1996–2001 Schneider Electric All Rights Reserved 1

INSTALLATION

1. Remove power screws and lift off cover.

Remove Old Control Unit 2. Remove wire cover.

DANGER

HAZARD OF ELECTRIC SHOCK, BURN, OREXPLOSION

• This equipment must be installed andserviced only by qualified electricalpersonnel.

• Turn off all power supplying this equipmentbefore working on or inside equipment.

• Always use a properly rated voltage sensingdevice to confirm power is off.

• Replace all devices, doors and covers beforeturning on power to this equipment.

Failure to follow this instruction will result indeath or serious injury.

0 6 3 1 3 3 1 9

0 6 3 1 3 3 2 0

0 6 3 1 3 3 2 1

0 6 3 1 3 3 2 1

0 6 3 1 3 3 2 2



Control Unit Replacement Instructions for MASTERPACT ® Circuit Breaker 48049-107-01Control Unit Replacement 12/2001

© 1996–2001 Schneider Electric All Rights Reserved2

3. Remove screws and lift control unit.

Install New Control Unit 4. Remove wire cover.

5. Connect wires, matching phases.

0 6 3 1 3 3 2 7

0 6 3 1 3 3 2 8

If replacement control unit has different featuresthan old control unit, terminal block (secondarydisconnects) on the circuit breaker and/or cradlemay have to be added or removed. Contactfactory for more information.

Neutral plug is only available on4-pole circuit breaker or 3-pole circuitbreaker with external neutral sensorconnection.

0 6 3 1 3 3 2 3

0 6 3 1 3 3 2 4

CAUTIONHAZARD OF EQUIPMENT DAMAGE

Connect wires to match phase sequence(N, 1, 2, or 3) between trip unit and circuitbreaker.

Failure to follow this instruction can result inequipment damage.

0 6 3 1 3 3 2 5

0 6 3 1 3 3 2 6



48049-107-01 Control Unit Replacement Instructions for MASTERPACT ® Circuit Breaker12/2001 Control Unit Replacement


6. Place control unit (A) on circuit breaker, tighten screws, (B) and replacewire cover (C).

0 6 3 1 3 3 3 1

A

0 6 3 1 3 3 3 2

B

62 lb-in(7 N•m)

0 6 3 1 3 3 3 3

C

Replace Circuit Breaker Cover

0 6 3 1 3 3 2 9

Replace cover.

0 6 3 1 3 3 3 0

13 lb-in(1.5 N•m)

Replace cover screws.





TESTING

This is an instantaneous tripping test (trips inless than one second) using a single-phaseprimary current injection between the line andload of each pole of the circuit breaker.

This tests the connection of thecurrent sensor to the control unitonly. This test is not designed tocalibrate the circuit breaker .Calibration tests are completedat the factory before shipping eitherthe circuit breaker or the control unitalone.

Test control unit according to the appropriate

table:• STR18M: see table 1• STR28D: see table 2• STR38S, STR58U

— with ground-fault protecton: see table 3 — without ground-fault protection: see

table 4

Io = rating plugIn = sensor ratingIr = long time pick up

tr = long time delaylm = short time pick uptm = short time delayI = instantaneous pick upIh = ground fault pick upth = ground fault delay

Table 1: STR18M

Testing Procedure Current to Inject*

1. Record the control unit settings.2. Adjust settings:

instantaneousl = 2

3. Program the injection time to 1500 ms.4. Inject the current pole-by-pole.5. Reset the control unit to the original settings.

Sensor rating (A) Current (A)

200 460

250 575

320 736

400 920

500 1150

600 1380

630 1449

800 1840

1000 2300

1200 2760

1250 2875

1600 3680

2000 4600

2500 5750

3000 6900

3200 7360

4000 9200

5000 11500

6000 13800

6300 14420

*Current injection = (2 X i n) + 15%

12 14

19

22max2

4

xIn

push to reset

STR 18

test

+

6

12 14

19

22max2

4

xIn

6l = 2

0

6 3 1 3 3 3 4





Table 3: STR38S, STR58U with Residual Ground-fault Protection(Option T)


1. Record the control unit settings.2. Adjust settings:

long-timeIr = 0.8short-timeIm = 1.5tm = 0.1tm- l2t = offground-fault pickuplh = ln or 1200A max.th = 0.1th- l2t = off

3. Program the injection time to 1500 ms.4. Inject the current pole-by-pole.5. Reset the control unit to the original

settings.

Sensor Rating (A) Current (A)

125 144

150 173

200 230

250 288

300 345

400 460

500 575

600 690

800 920

1000 1150

1200 1380

1600 1380

2000 1380

2500 13803000 1380

3200 1380

4000 1380

5000 1380

6000 1380

6300 1380

*Current injection = l n (or 1200A) + 15%

push to reset

II1 I2 I3

90%

50%

20%

STR 38 S

Ir90

105%Ir

.88.9 .92

.95

.981.8

.85

xIo

Im tm

34 5

6

8101.5

2

xIr

.3.4 .3

.1.1

.2

on I2t off

.2

0

Ir fault

tr

Im faulttm

I

faultIh

th

t

i

test

+ –

– +

T

F

test

Ih th

400

500 600800

1000

1200250

320

A

.3.4 .4

.2.1

.2

on I2t off

.3

.1

I

offmax.xIn

Ir :

Im :

th :

overcurrent

ground

20%

Ir90

105%Ir

.88.9 .92

.95

.981.8

.85

xIo

Im tm

34 5

6

8101.5

2

xIr

.3.4 .3

.1.1

.2

on I2t off

.2

0

Ir fault

tr

Im faulttm

I

faultIh

th

t

i

+ –

TIh th

400500 600

800

1000

1200250

320

A

.3.4 .4

.2.1

.2

on I2t off

.3

.1

I

offmax.xIn

Ir :

Im :

th :

overcurrent

0 6 3 1 3 3 3 6 Settings

Ir = 0.8

Im = 1.5

tm = 0.1

tm - I2

t = off

Ih = at max.

th = 0.1

th - I2t = off



48049-107-01 Control Unit Replacement Instructions for MASTERPACT ® Circuit Breaker12/2001 Control Unit Replacement


Table 4: STR38S, STR58U Without Residual Ground-fault Protection(Option T) With or Without “Source Ground Return”Ground-fault Protection (Option W)


1. Record the control unit settings.

2. Adjust settings:long-timelr = 0.8short-timeIm = 1.5tm = 0.1tm -l2t = off

3. Program the injection time to 1500ms.4. Inject the current pole-by-pole.5. Reset the control unit to the original

settings.

125 173

150 207200 276

250 345

300 414

400 552

500 690

600 828

800 1104

1000 1380

1200 1656

1600 2208

2000 2760

2500 3450

3000 4140

3200 4415

4000 5520

5000 6900

6000 8280

6300 8694

*Current injection = [(I o x 0.8) x 1.5] + 15%

push to reset I+T L+I

I

L+T

L off

T

L+I+T

II1 I2 I3

90%

50%

20%

STR 58 U

Ir tr90

105

τ tr

%Ir.88

.9 .92.95

.981.8

.85

xIo

60120 240

48015

30

at 1.5Ir

Im tm

34 5

6

8101.5

2

xIr

.3.4 .3

.1.1

.2

on I2t off

.2

0

Ir fault

tr

Im faulttm

I

faultIh

th

t

i

test

+ –

– +

T

R

F

test

Ih 1200AMax th

400500 600

800

10001200250

320

A

.3.4 .4

.2.1

.2

on I2t off

.3

.1

I

812 14

19

22Max.2

4

xIn

Ic1 Ic2.86

.9 .93.95

.981.8

.85

xIr

.7.8 .85

.95.5

.6

.9

1xIr

V

Ir :

Im :

th :

min.norm

overcurrent

ground

reset V

20%

Ir tr90

105

τ tr

%Ir.88

.9 .92.95

.981.8

.85

xIo

60120 240

48015

30

at 1.5Ir

Im tm

34 5

6

8101.5

2

xIr

.3.4 .3

.1.1

.2

on I2t off

.2

0

Ir fault

tr

Im faulttm

I

faultIh

th

t

i

T

R

Ih 1200A Max th400

500 600800

10001200250

320

A

.3.4 .4

.2.1

.2

on I2t off

.3

.1

I

812 14

19

22Max.2

4

xIn

Ic1 Ic2

Ir :

Im :

th :

min.norm

0 6 3 1 3 3 3 7

Rating plug = currentsensor (for this test)

Ir = 0.8

Im = 1.5

tm = 0.1

tm - I2t = off



Electrical equipment should be serviced only by qualified personnel. No responsibilityis assumed by Schneider Electric for any consequences arising out of the use of thismaterial. This document is not intended as an instruction manual for untrainedpersons.

Square D CompanyPO Box 30693700 Sixth St SWCedar Rapids IA 52406-3069 USA1-888-SquareD (1-888-778-2733)www.SquareD.com

© 1996–2001 Schneider Electric All Rights Reserved

Control Unit Replacement Instructions for MASTERPACT ® Circuit Breaker 48049-107-01Instruction Bulletin 12/2001

8

masterpact m strs

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