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Application Da

29-16

Pag

Time/Current Characteristi c Curves forWestinghouse Series C ® J-FrameCircuit Breakers

December 1998Mail ed to : E/29-100A Westinghouse

AB DE-ION ®

Circuit Breakers

Breaker Descript ion Curve No. Page

Series C Types JDB, JD, HJD Equipped W ith Type JTTherm al-Magneti c Trip Uni t ............................................................. SC-4247-87C 2

Series C Types JDC Equipped W ith Type JTTherm al-Magneti c Trip Uni t ............................................................. SC-4248-87B 3

Individual ov ersize copies of curves listed above pr inted on onion-skin paper are availabin limited quantity from:

Cutler-Hammer

Westinghouse &Cutler-Hammer ProductsFive Parkway CenterPitt sburgh , PA 15220

When ordering on ion-skin curves, use numb er at bottom of page wh ere curve appears,i.e., SC-4547-87B. Requests for full sets of curves will not be honored.

Cutler-Hammer

Westinghouse &Cutler-Hammer ProductsFive Parkway CenterPittsburgh, Pennsylvania, U.S.A. 15220

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Application Data

29-167J

Page 2

AB DE-ION Circuit Breakers

December 1998

Series C Types JDB, JD, HJD Equipped Wit h Type JT Thermal-Magnetic Trip Unit

Curve No. SC-4247-87C

Maximum

(125-225A)

Adjustable Magnetic Trip

5 X±20% ±10%

1 0 X

(250A)

(70-100A)

Interrupting RatingDetermines Endof Curve

TypicalTrip UnitNameplate

Individual PoleAdjustments

Maximum Single PoleTrip Times at 25°C�

ThermalMagneticTripUnit

C PushtoTrip

MagneticMultiplesOf In

10

7.5

10 5

7.5

10 5

Amps(In)

Cat.No.40°C

7.5

5

Minimum

Circuit Breaker Time/Current Curves

Series C ® J-Frame Circuit BreakersEquipped with Type JT Thermal-Magnetic Trip Unit

Catalog Types JDB, JD, HJD Circuit Breakers, 2, 3 and 4 Poles

For application and coordination purposes only. Thermal calibrationbased on 40°C ambient, cold start. Connected with four (4) feet ofrated wire (60°C up to 125 amps, 75˚C above 125 amps) per terminal.Tested in open air with current in all poles. Instantaneous calibrationbased on single-pole tests.

Maximum Voltage600 V., Ac (50/60 Hz.)250 V., Dc

Breaker RatingRated Amperes (In)

Single pole test data at 25°C based on NEMA Procedures(AB 4-1991) for verify ing performance of molded case circuitbreakers.

Note: For additional information on the trip uni t, see IL 29C600.

Interrupting Rating

�

Instantaneous Trip Amperes(See Figure Below)

70, 90, 100,125, 150, 175,200, 225, 250

500 to 1000% of trip unit rating. (Dc valuesare approximately 40% higher)

UL/CSA

RMS Sym. kA, 50/60 Hz.240 V.

BreakerType

JDBJDHJD

480 V. 600 V. 250 V.

101022

IEC 157-1 (P1)

RMS Sym. kA, 50/60 Hz.

240 V., (Ue) 380 V., (Ue) 415 V., (Ue) 250 V., (Ue)

kA, Dc

kA, Dc

6565

100

353565

181825

101022

6565

100

353565

353565

JDBJDHJD

100

50

30

20

10

5

3

2

1

.5

.3

.2

.1

.05

.03

.02

.01

.005

.003

.002

.001

T I M E I N S E C O N D S

1,000

500

300

200

5,000

3,000

2,000

1 H O U R

1 M

I N U T E

2 H O U R S

T I M E I N S

E C O N D S

10,000

100

50

20

10

5

3

2

1

.5

.3

.2

.1

.05

.03

.02

.01

.005

.003

.002

.001

1,000

500

300

200

5,000

3,000

2,000

1 H O U R

1 M

I N U T E

2 H O U R S

1 0 0

8 0

6 0

9 0

7 0

5 0

1 0 0 0

8 0 0

6 0 0

9 0 0

7 0 0

5 0 0

4 0 0

3 0 0

2 0 0

1 0 ,

0 0 0

8 0 0 0

6 0 0 0

9 0 0 0

7 0 0 0

5 0 0 0

4 0 0 0

3 0 0 0

2 0 0 0

1 0 0 ,

0 0 0

8 0 ,

0 0 0

6 0 ,

0 0 0

9 0 ,

0 0 0

7 0 ,

0 0 0

5 0 ,

0 0 0

4 0 ,

0 0 0

3 0 ,

0 0 0

2 0 ,

0 0 0

1 0 , 0

0 0

8 0 0 0

6 0 0 0

9 0 0 0

7 0 0 0

5 0 0 0

4 0 0 0

3 0 0 0

2 0 0 0

1 0 0 0

8 0 0

6 0 0

9 0 0

7 0 0

5 0 0

4 0 0

3 0 0

2 0 0

1 0 0

8 0

6 0

9 0

7 0

5 0

1 0 0 , 0

0 0

8 0 , 0

0 0

6 0 , 0

0 0

9 0 , 0

0 0

7 0 , 0

0 0

5 0 , 0

0 0

4 0 , 0

0 0

3 0 , 0

0 0

2 0 , 0

0 0

Maximum Interrupting Time

CURRENT IN PERCENT OFBREAKER TRIP UNIT RATING (In)

CURRENT IN PERCENT OFBREAKER TRIP UNIT RATING (In)

10,000

30

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Application Data

29-167J

Page 4

AB DE-ION Circuit Breakers

December 1998

Printed in U.S.A.

Cutler-Hammer

Westinghouse &Cutler-Hammer ProductsFive Parkway CenterPitt sburgh , Pennsylv ania, U.S.A. 15220

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