ECSR

Class RK5 600Vac, 70 to 600A

Dual-Element, Time-Delay Fuses

Form No. ESCR 70-600

Page 2 of 2

Data Sheet #1318

07-10-07

BU-SB07255

Current Limitation Curves

Time-Current Characteristic Curves– Average

Melt

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out notice, to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without

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Current-Limiting Effects

ECSR Apparent RMS Symmetrical Let-Through Current

Prosp.

SCC

30A

60A

100A

200A

400A

600A

5000

1400

2000

2900

3950

5000

5000

10,000

1850

2650

3600

5100

8550

10,000

15,000

2200

3200

4100

5950

9750

13,700

20,000

2450

3550

4500

6600 10,700

15,000

25,000

2700

3900

4850

7150 11,500

16,100

30,000

2900

4280

5150

7650 12,200

17,050

35,000

3100

4400

5400

8100 12,800

17,900

40,000

3300

4760

5600

8500 13,400

18,700

50,000

3550

5150

6050

9250 14,400

20,050

60,000

3800

5500

6400

9850 15,250

21,250

80,000

4300

6100

7000

10,950 16,750

23,300

100,000

4500

6600

7550

11,900 18,000

25,000

150,000

5200

8000

8600

13,800 20,550

28,450

200,000

5800

8500

9400

15,350 22,550

31,200

Fuse Reducers For Class R Fuses

Equipment

Desired Fuse

Catalog Number

Fuse Clips

(Case) Size

(Pairs) 600V

200A

100A

No. 2621-R

400A

100A

No. 2641-R

200A

No. 642-R

100A

No. 2661-R

600A

200A

No. 2662-R

400A

No. 2664-R*

*Single reducer only (pair not required).