6 of 6

Class T Fuses

JLLS Series

Littelfuse.com/JLLS

©2022 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 07/14/2022

Disclaimer Notice – Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for

their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/product-disclaimer.

- DATA GENERATED IN EXCEL -

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

20

10

9

8

7

6

5

4

3

2

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

20

10

9

8

7

6

5

4

3

2

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

- 225A

- 250A

- 300A

- 350A

- 400A

CURRENT IN AMPERES

BASIS FOR DATA:

TEST VOLTAGE:

TIME CONSTANT/POWER FACTOR:

FUSE CATALOG NUMBER:

DRAWN BY:

DATE:

REVISION:

DRAWING NO.:

SHEET

TIME CURRENT CHARACTERISTIC CURVES

LITTELFUSE, INC.

CHICAGO, IL. USA

LLL

01/21/14

A

6 OF 8

FCC01-JLLSP

JLLSP 1A - 1200A

- DATA GENERATED IN EXCEL -

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

20

10

9

8

7

6

5

4

3

2

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

20

10

9

8

7

6

5

4

3

2

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

- 450A

- 500A

- 600A

CURRENT IN AMPERES

BASIS FOR DATA:

TEST VOLTAGE:

TIME CONSTANT/POWER FACTOR:

FUSE CATALOG NUMBER:

DRAWN BY:

DATE:

REVISION:

DRAWING NO.:

SHEET

TIME CURRENT CHARACTERISTIC CURVES

LITTELFUSE, INC.

CHICAGO, IL. USA

LLL

01/21/14

A

7 OF 8

FCC01-JLLSP

JLLSP 1A - 1200A

- DATA GENERATED IN EXCEL -

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

20

10

9

8

7

6

5

4

3

2

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

1000

900

800

700

600

500

400

300

200

100

90

80

70

60

50

40

30

20

10

9

8

7

6

5

4

3

2

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

- 700A

- 800A

- 900A

- 1000A

- 1100A

- 1200A

BASIS FOR DATA:

TEST VOLTAGE:

TIME CONSTANT/POWER FACTOR:

FUSE CATALOG NUMBER:

DRAWN BY:

DATE:

REVISION:

DRAWING NO.:

SHEET

TIME CURRENT CHARACTERISTIC CURVES

LITTELFUSE, INC.

CHICAGO, IL. USA

LLL

01/21/14

A

8 OF 8

FCC01-JLLSP

JLLSP 1A - 1200A

CURRENT IN AMPERES

Time Current Curves