Littelfuse.com/jlls, Littelfuse.com/jlln

© 2020 Littelfuse, Inc.

Rev: 061820

8 of 9

CLASS T – JLLN / JLLS SERIES

SHORT CIRCUIT

CURRENT*

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS

30 A

60 A

100 A

200 A

400 A

600 A

800 A

1200 A

5,000

700

775

1,100

1,650

3,500

4,000

5,000

5,000

10,000

900

1,000

1,400

2,100

4,400

5,100

6,750

8,250

15,000

1,000

1,100

1,600

2,400

5,000

5,900

7,750

10,000

20,000

1,100

1,250

1,800

2,700

5,500

6,500

8,750

11,000

25,000

1,230

1,300

1,950

2,900

6,000

7,000

9,500

12,000

30,000

1,300

1,475

2,050

3,100

6,400

7,500

10,000

12,500

35,000

1,330

1,575

2,150

3,300

6,750

7,750

10,500

13,500

40,000

1,430

1,600

2,300

3,500

7,000

8,000

11,000

14,000

50,000

1,500

1,750

2,400

3,700

7,500

8,750

12,000

15,000

60,000

1,700

1,900

2,700

4,000

8,000

9,500

12,500

16,000

80,000

1,850

2,100

2,800

4,400

9,000

10,500

14,000

17,500

100,000

2,000

2,250

3,150

4,800

9,750

11,500

15,000

18,500

150,000

2,300

2,600

3,600

5,500

11,000

13,000

17,500

22,000

200,000

2,600

2,800

3,900

6,000

12,000

14,500

19,500

24,000

*Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

- DATA GENERATED IN EXCEL -

100

1,000

10,000

100,000

1,000,000

100

1,000

10,000

100,000

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

1200A -

800A -

600A -

400A -

200A -

100A -

60A -

30A -

BASIS FOR DATA:

TEST VOLTAGE: 300V

TIME CONSTANT/POWER FACTOR:

FUSE CATALOG NUMBER:

DRAWN BY:

DATE:

REVISION:

DRAWING NO.:

SHEET

PEAK LET-THRU CHARACTERISTIC CURVES

LITTELFUSE, INC.

CHICAGO, IL. USA

LLL

01/21/2014

A

2 OF 2

FCC05-JLLNP

JLLNP 30A - 1200A

Peak Let-Thru Curve and Current-Limiting Effects of JLLN (300 V) Fuses