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PowerSafe – Commercial & Industrial

97

PowerSafe Distribution

Maximum Earth Loop Impedance

PowerSafe 10kA MCB

CN/CH Frame MCCB

CN/CH Frame Maximum Earth Loop Impedances Zs (Ohms) for Uo = 240 VAC

Current rating (A)

160

200

250

315

400

500

0.4 Second Tripping Time

0.13636

:

0.1091

:

0.0873

:

0.0693

:

0.0545

:

0.0436

:

5.00 Second Tripping Time

0.2727

:

0.2182

:

0.1745

:

0.1385

:

0.1364

:

0.1091

:

Current rating (A)

630

800

-

1250

-

Magnetic Trip Stting

0.4 Second Tripping Time

0.0346

:

0.0272

:

-

0.0175

:

-

High

5.00 Second Tripping Time

0.0866

:

0.0682

:

-

0.0436

:

-

Low

Tripping Elements

Overload: Adjustable 70-100% of In

Instantaneous - Adjustable 160-315A (5-10 In), 400-800A (4-10 In)

Rating

SP, TP

(160-315A)

5-10 In

(400-800A)

4-10 In

MCB B Type Maximum Earth Loop Impedances for SP MCBs Zs (Ohms) for UO = 240 VAC

Current Rating (A)

6

10

13

16

20

25

32

40

50

63

5 Second Tripping Time

10.00

:

6.00

:

4.61

:

3.75

:

3.00

:

2.40

:

1.88

:

1.50

:

1.20

:

0.95

:

0.4 Second Tripping Time

8.00

:

4.80

:

3.69

:

3.00

:

2.40

:

1.92

:

1.50

:

1.20

:

0.96

:

0.76

:

MCB C Type Maximum Earth Loop Impedances for Single Pole, Double Pole, Three Pole MCBs Zs (Ohms) for UO = 240 VAC

Current Rating (A)

6

10

13

16

20

25

32

40

50

63

5 Second Tripping Time

10.00

:

6.00

:

4.61

:

3.75

:

3.00

:

2.40

:

1.88

:

1.50

:

1.20

:

0.95

:

0.4 Second Tripping Time

4.00

:

2.40

:

1.84

:

1.50

:

1.20

:

0.96

:

0.75

:

0.60

:

0.48

:

0.38

: