0611CT1603

Trip Units

PowerPact B-frame circuit breakers offers a fixed, factory-sealed thermal-magnetic trip unit designed to open automatically under overload or short circuit conditions.

B-frame thermal-magnetic circuit breakers contain individual thermal (overload) and instantaneous (short circuit) sensing elements in each pole.

Thermal-Magnetic Trip Units

B-Frame Trip Curve

(ln) Fixed threshold thermal protection against overload.

(li) Fixed threshold instantaneous protection against short-circuits.

AC Magnetic Trip Levels

Ii

Rated Current (A)

15

20

25

30

35

40

45

50

60

70

80

90

100

110

125

Hold (A)

400

400

400

400

400

400

400

480

640

640

800

1000

1000

1000

1000

Trip (A)

600

600

600

600

600

600

600

720

960

960

1200

1500

1500

1500

1500

DC Magentic Trip Levels

The Time Current Curves (trip curves) provide the complete time-current characteristics of the circuit breaker when applied on an AC system. When applying thermal-magnetic circuit breakers on DC systems, they retain the same thermal tripping characteristics, but the magnetic trip levels vary. See table for the appropriate DC magnetic hold and trip levels.

Ii

Rated Current (A)

15

20

25

30

35

40

45

50

60

70

80

90

100

110

125

Hold (A)

460

460

510

510

510

510

510

510

790

900

900

1200

1200

1200

1200

Trip (A)

680

680

800

800

800

800

800

800

1240

1420

1420

1850

1850

1850

1850

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