FUSES

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 Products Catalog

Class L ........................................................................ 11-15

Class RK1 ..................................................................... 16-18

Class RK5 ..................................................................... 19-22

 

SPFR Solar Inverter Fuse ....................................................... 23

Class K/H ..................................................................... 24-26

Class J ........................................................................ 27-29

Class T ....................................................................... 30-31

Class G ........................................................................... 32

Class CC/CD ................................................................. 33-35

Table of Contents

Section Overview

For over 80 years Littelfuse

®

 has been providing fuses to the electrical 

market. You can continue to count on our manufacturing and supply 
chain processes to deliver high quality fuses when you need them. 
At Littelfuse we leverage our global reach to stay on top of the latest 
applications and standards. Whether your circuit protection needs are 
focused on OEM, MRO, or construction, we are committed to being 
your circuit protection partner and appreciate your business.

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1

Fuses — UL Class L

KLPC SEriES Powr-Pro

®

 FUSES

 

 

     600 VAC • Time-Delay • 200-6000 Amperes

Description

KLPC series POWR-PRO

®

 fuses meet or exceed the most 

stringent project specifications, such as silver links, silver-plated 
copper end bells, glass-reinforced melamine bodies, O-ring seals 
between body and end bells, and granular quartz fillers.

Applications

Switchboard mains and feeders

• 

Motor control center mains

• 

Large motor branch circuits

• 

Protection of power circuit breakers

• 

Features/Benefits

POWR-PRO Performance (see pg. 3)

• 

Best in class time-delay withstand

• 

Current-Limiting

• 

Easily coordinated with other system components

• 

300 kA AC Interrupting Rating (self certified)

• 

Specifications

Voltage Ratings: 

 

AC: 

600 V 

 

DC: 

480 V

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

 

300 kA rms symmetrical 

 

 

(Littelfuse self-certified) 

 

DC: 

20,000 A

Ampere Range:

 

200 – 6000 A

Approvals:

 

AC: 

Standard 248-10, Class L 

 

 

UL Listed 601–6000 A 

 

 

(File No. E81895) 

 

 

UL Recognized 200–600 A 

 

 

(File No. E71611) 

 

 

CSA Certified 200–6000 A 

 

 

(File No. LR29862) 

 

 

Federal Specifications 700–6000 A 

 

 

(QPL-W-F-1814)  

 

DC: 

Littelfuse self-certified

amPErE ratingS

200

500

800

1350

2000

3000

250

600

900

1400

2100

3500

300

601

1000

1500

2200

4000

350

650

1100

1600

2300

4500

400

700

1200

1800

2400

5000

450

750

1300

1900

2500

6000

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/klpc

Dimensions

Please refer to Class L dimensions ............................. pg. 15

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 14

Ordering Information

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

KLPC

800

KLPC800

KLPC800.X

KLPC

Class L F

uses

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1

Fuses — UL Class L

KLLU SEriES FUSES

600 VAC • Time-Delay • 601-4000 Amperes

Description

KLLU series fuses meet or exceed UL requirements for 
UL Class L fuses. The KLLU series offers an economical 
alternative to KLPC POWR-PRO

®

 fuse with a slightly higher 

peak let through current.

Applications

Service switches

• 

Switchboard mains and feeders

• 

Motor control center mains

• 

Large motor branch circuits

• 

Circuit breaker protection

• 

Features/Benefits

Current-Limiting

• 

Easily coordinated with other system components

• 

200 kA AC Interrupting Rating

• 

Specifications

Voltage Ratings: 

 

AC: 

600 V 

 

DC: 

300 V

Interrupting Ratings:

  AC: 

200 kA 

 

DC: 

20 kA

Ampere Range:

 

601–4000 A

Approvals:

 

Standard 248-10, Class L 

 

UL Listed (File No. E81895) 

 

CSA Certified (File No. LR29862) 

 

DC: 

Littelfuse self-certified

amPErE ratingS  

601

750

1000

1400

1800

3000

650

800

1200

1500

2000

3500

700

900

1350

1600

2500

4000

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/kllu

Dimensions

Please refer to the Class L dimensions ....................... pg. 15

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 14

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

KLLU

601

KLLU601

KLLU601.X

Ordering Information

KLLU

Class L F

uses

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Fuses — UL Class L

13

LDC SEriES Powr-Pro

®

 FUSES

 

 

     600 V AC/DC • Time-Delay • 150-2000 Amperes

Description

High DC voltage and interrupting ratings make the  
POWR-PRO LDC ideal for DC applications. The DC 
interrupting performance exceeds UL listing requirements.

Applications

Solar inverter and array protection

• 

UPS protection especially for large battery circuits

• 

DC distribution and variable speed drives

• 

Mass transit systems

• 

Features/Benefits

POWR-PRO Performance (see pg. 3)

• 

Extremely Current-Limiting

• 

600 V AC/DC rated

• 

200 kA AC Interrupting Rating

• 

50 kA DC Interrupting Rating

• 

Specifications

Voltage Ratings: 

 

AC: 

600 V 

 

DC: 

600 V

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

DC: 

50 kA 

 

 

(16 millisecond time-constant)

Ampere Range:

 

150–2000 A

Approvals:

 

Standard 248-10, Class L 

 

UL Listed 601–2000 A (File No. E81895) 

 

UL Recognized 150–600 A 

 

(File No. E71611) 

 

CSA Certified 150–2000 A 

 

(File No. LR29862)

amPErE ratingS

150

450

750

1201

1601

200

500

800

1300

1800

250

600

900

1350

1900

300

601

1000

1400

2000

350

650

1100

1500

400

700

1200

1600

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/ldc

Dimensions

Please refer to the Class L dimensions ....................... pg. 15

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 14

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

LDC

700

LDC700

0LDC700.X

Ordering Information

LDC

Class L F

uses

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1

Class L F

uses

Fuses — UL Class L

14

Short CirCUit 

CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

800 a

1200 a

1600 a

2000 a

3000 a

4000 a

5000 a

6000 a

5,000

5,000

5,000

5,000

5,000

5,000

5,000

5,000

5,000

10,000

8,800

10,000

10,000

10,000

10,000

10,000

10,000

10,000

15,000

10,500

13,500

15,000

15,000

15,000

15,000

15,000

15,000

20,000

12,000

15,000

19,000

20,000

20,000

20,000

20,000

20,000

25,000

13,000

16,000

21,000

24,000

25,000

25,000

25,000

25,000

30,000

14,000

18,000

23,000

26,000

30,000

30,000

30,000

30,000

35,000

15,000

19,000

24,000

27,000

32,000

35,000

35,000

35,000

40,000

16,000

20,000

25,000

28,000

34,000

40,000

40,000

40,000

50,000

17,000

22,000

27,000

31,000

37,000

42,500

50,000

50,000

60,000

18,000

24,000

29,000

34,000

40,000

46,000

52,000

60,000

80,000

20,000

26,000

32,000

37,000

44,000

51,000

57,000

70,000

100,000

21,000

27,000

34,000

40,000

46,000

57,000

65,000

75,000

150,000

23,000

31,000

38,000

44,000

54,000

67,000

75,000

87,000

200,000

24,000

34,000

42,000

46,000

57,000

70,000

80,000

95,000

Current-Limiting Effects of KLPC (600 V) Fuses

Current-Limiting Effects of LDC (600 V) Fuses

Short CirCUit 

CUrrEnt*

aPParEnt rmS Sym mEt ri CaL CUrrEnt For VarioUS FUSE ratingS

800 a

1200 a

1600 a

2000 a

5,000

5,000

5,000

5,000

5,000

10,000

8,500

10,000

10,000

10,000

15,000

9,750

14,000

15,000

15,000

20,000

10,500

15,000

19,000

20,000

25,000

11,500

16,000

21,000

25,000

30,000

12,000

17,000

22,000

26,000

35,000

12,500

18,000

23,000

28,000

40,000

13,500

19,000

24,000

30,000

50,000

14,000

21,000

26,000

32,000

60,000

15,000

22,000

28,000

34,000

80,000

16,000

24,000

30,000

36,000

100,000

18,000

25,000

33,000

40,000

150,000

20,000

30,000

38,000

44,000

200,000

23,000

32,000

41,000

46,000

*Prospective RMS Sym met ri cal Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

Short-CirCUit 

CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

800 a

1200 a

1600 a

2000 a

3000 a

4000 a

5,000 

5,000

5,000

5,000

5,000

5,000

5,000

10,000 

10,000

10,000

10,000

10,000

10,000

10,000

15,000 

11,900

15,000

15,000

15,000

15,000

15,000

20,000 

13,000

18,500

20,000

20,000

20,000

20,000

25,000 

14,000

20,000

25,000

25,000

25,000

25,000

30,000 

14,500

21,000

26,500

30,000

30,000

30,000

35,000 

15,000

22,000

28,500

34,000

35,000

35,000

40,000 

16,000

23,000

30,000

35,000

37,000

40,000

50,000 

17,000

24,000

32,000

38,000

39,000

44,000

60,000 

18,000

26,000

34,000

42,000

43,000

50,000

80,000 

19,000

28,000

36,000

44,000

46,000

54,500

100,000 

21,000

30,000

38,000

46,000

48,000

57,500

150,000 

24,000

35,000

44,000

50,000

51,000

68,000

200,000 

26,000

38,000

48,000

53,000

60,000

74,000

Current-Limiting Effects of KLLU (600 V) Fuses

CLaSS L CUrrEnt-Limiting EFFECtS  

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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1

Class L F

uses

Fuses — UL Class L

CLaSS L SEriES DimEnSionS

B

C

J

F

M

FIG.1

A

A

B

C

J

D E F

N

M

FIG.2

D E F

A

B

C

G

H

N

M

J

 

FIG. 3

B

D

G

A F

H

J

M

FIG. 5

N

M

G

D E F

A

B

C

H

J

FIG. 4

K

L

amPErES

Fig. 

no.

DimEnSionS in inChES (mm)

a

b

C

D

E

F

g

h

J

K

L

m

n

200-800

1

3

3

⁄

4

 

(95.3)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

 —

—

8

5

⁄

8

(219.1)

—

—

2

(50.8)

2

1

⁄

2

(63.5)

3

⁄

8

(9.5)

5

⁄

8

 x 1

1

⁄

8

(15.9) x (28.6)

— 

900-1200

2

3

3

⁄

4

(95.3)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

9

1

⁄

4

(235.0)

9

1

⁄

2

(241.3)

10

3

⁄

4

(273.1)

—

—

2

(50.8)

2

1

⁄

2

(63.5)

3

⁄

8

(9.5)

5

⁄

8

 x 

3

⁄

4

(15.9) X (19.1)

5

⁄

8

 x 1

1

⁄

8

 

(15.9) X (28.6)

1300-1600

2

3

3

⁄

4

(95.3)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

9

1

⁄

4

(235.0)

9

1

⁄

2

(241.3)

10

3

⁄

4

(273.1)

—

—

2

3

⁄

8

(60.3)

3

(76.2)

7

⁄

16

(11.1)

5

⁄

8

 X 

3

⁄

4

(15.9) X (19.1)

5

⁄

8

 X 1

1

⁄

8

 

(15.9) X (28.6)

1800-2000

2

3

3

⁄

4

(95.3)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

9

1

⁄

4

(235.0)

9

1

⁄

2

(241.3)

10

3

⁄

4

(273.1)

—

—

2

3

⁄

4

(69.9)

3

1

⁄

2

(88.9)

1

⁄

2

(12.7)

5

⁄

8

 x 

3

⁄

4

(15.9) x (19.1)

5

⁄

8

 x 1

1

⁄

8

 

(15.9) x (28.6)

2100-2500

3

4

(101.6)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

9

1

⁄

4

(235.0)

9

1

⁄

2

(241.3)

10

3

⁄

4

(273.1)  

1

5

⁄

8

(41.3)

1

3

⁄

4

(44.5)

3

1

⁄

2

(88.9)

5

(127.0)

3

⁄

4

(19.1)

5

⁄

8

 X 

3

⁄

4

(15.9) x (19.1)

5

⁄

8

 X 1

1

⁄

8

 

(15.9) x (28.6)

2501-3000

3

4

(101.6)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

9

1

⁄

4

(235.0)

9

1

⁄

2

(241.3)

10

3

⁄

4

(273.1)

1

5

⁄

8

(41.3)

1

3

⁄

4

(44.5)

4

(101.6)

5

(127.0)

3

⁄

4

(19.1)

5

⁄

8

 X 

3

⁄

4

(15.9) x (19.1)

5

⁄

8

 X 1

1

⁄

8

 

(15.9) x (28.6)

3500-4000

4

4

(101.6)

5

3

⁄

4

(146.1)

6

3

⁄

4

(171.5)

9

1

⁄

4

(235.0)

9

1

⁄

2

(241.3)

10

3

⁄

4

(273.1)

1

3

⁄

4

(44.5)

3

1

⁄

4

(82.6)

4

3

⁄

4

(120.7)

5

3

⁄

4

(146.1)

3

⁄

4

(19.1)

5

⁄

8

 x 1

3

⁄

8

(15.9) x (34.9)

5

⁄

8

 x 1

3

⁄

8

(15.9) x (34.9)

4500-5000

5

4

(101.6)

5

3

⁄

4

(146.1)

—

9

1

⁄

4

(235.0)

—

10

3

⁄

4

(273.1)

1

5

⁄

8

(41.3)

3

1

⁄

4

(82.6)

5

1

⁄

4

(133.4)

7

1

⁄

8

(181.0)

1

(25.4)

5

⁄

8

 DIA.

(15.9)

— 

6000

5

4

(101.6)

5

3

⁄

4

(146.1)

—

9

1

⁄

4

(235.0)

—

10

3

⁄

4

(273.1)

1

5

⁄

8

(41.3)

3

1

⁄

4

(82.6)

5

1

⁄

4

(133.4)

7

1

⁄

8

(181.0)

1

(25.4)

5

⁄

8

 DIA.

(15.9)

—

Dimensions in inches (mm)

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1

Class RK1 F

uses

Fuses — UL Class RK1

LLnrK/LLSrK/LLSrK_iD SEriES inDiCator

®

 Powr-Pro

®

 FUSES

 

 

     250/600 VAC • Dual Element • Time-Delay • 

1

/

10

-600 Amperes

Description

RK1 fuses are extremely current-limiting fuses meaning they 

greatly reduce or eliminate damage to circuits and equipment under 

short-circuit conditions. Replacing existing Class H, K and RK5 fuses 

with RK1 fuses is one of the easiest ways to immediately improve 

the protection of plant workers and equipment.

Applications

All general purpose circuits

• 

Motors

• 

Transformers

• 

Safety upgrades

• 

Features/Benefits

POWR-PRO Performance (see pg. 3)

• 

Indication

• 

Dual-element design

• 

Extremely Current-Limiting

• 

IEC Type 2 “No Damage” protection to IEC and NEMA 

• 

type motor starters
Indicating and 

• 

DIN mount fuseholders available

Specifications

Voltage Ratings: 

 

600 VAC/300 VDC (LLSRK/LLSRK_ID)

 

250 VAC/125 VDC (LLNRK)

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

 

300 kA rms symmetrical 

 

 

(Littelfuse self-certified) 

 

DC: 

20 kA

Ampere Range:

 

1/10 – 600 A

Approvals:

 

AC: 

Standard 248-12, Class RK1 

 

 

UL Listed (File No. E81895) 

 

 

CSA Certified (File No. LR29862) 

 

DC: 

Littelfuse self-certified 

 

Federal Specification WF-1814 

 

(QPL- W-F-1814)

amPErE ratingS

1

/

10

1

2 

8

/

10

6 

1

/

4

25

80

250

15

/

100

1 

1

/

8

3

7

30

90

300

2

/

10

1 

1

/

4

3 

2

/

10

8

35

100

350

1

/

4

1 

4

/

10

3 

1

/

2

9 

40

110

400

3

/

10

1 

6

/

10

4

10

45

125

450

4

/

10

1 

8

/

10

4 

1

/

2

12

50

150

500

1

/

2

2

5

15

60

175

600

6

/

10

2 

1

/

4

5 

6

/

10

17 

1

/

2

70

200

8

/

10

2 

1

/

2

6

20

75*

225

Note: All LLSRK_ID fuses rated 1 amp and above are Indicator

®

 fuses. 

*75 A is only ava lable for the 600 V.

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information:  

www.littelfuse.com/llsrk 
www.littelfuse.com/llnrk

Recommended Fuseholders

LFR60 Series ............................................................... pg. 90 
LFR25 Series ............................................................... pg. 90

PEAK LET

-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

1000000

100000

10000

1000

100

2

0

0

0

0

0

1

0

0

0

0

0

1

0

0

0

0

1

0

0

0

1

0

0

500 A

400 A

200 A

100 A

60 A

30 A

Peak Let-Thru Curve (600 V)

Note: For more information, see Peak Let-Thru Table on pg. 18

Dimensions

Please refer to the Class R dimensions ....................... pg. 22

Ordering Information

tyPE

SEriES amPEragE CataLog 

nUmbEr

SyStEm 

nUmbEr

INDICAtING

LLSRK_ID

60

LLSRK060ID

LSRK060.tXID

NON-INDICAtING

LLSRK

60

LLSRK060

LSRK060.t

600 V

250 V

tyPE

SEriES amPEragE

CataLog 

nUmbEr

SyStEm 

nUmbEr

NON-INDICAtING

LLNRK

80

LLNRK080

LNRK080.V

LLSRK

QPL

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

17

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class RK1 F

uses

Fuses — UL Class RK1

17

KLnr/KLSr SEriES FUSES

250/600 VAC • Fast-Acting • 1-600 Amperes

amPErE ratingS

1

10

40

100

250

2

12

45

110

300

3

15

50

125

350

4

20

60

150

400

5

25

70

175

450

6

30

80

200

500

8

35

90

225

600

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information:  

www.littelfuse.com/klsr 
www.littelfuse.com/klnr

Recommended Fuseholders

LFR60 Series ............................................................... pg. 90 
LFR25 Series ............................................................... pg. 90

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 18

Dimensions

Please refer to the Class R dimensions ....................... pg. 22

Ordering Information

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

KLSR

90

KLSR090

KLSR090.V

600 V

250 V

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

KLNR

90

KLNR090

KLNR090.V

KLSR

Description

KLSR/KLNR fuses are an economical single element design 
providing the safety of an RK1 fuse.

Applications

Resistance heaters

• 

Lighting circuits

• 

Non-inductive loads

• 

Features/Benefits

Extremely Current-Limiting

• 

Indicating and 

• 

DIN mount fuseholders available

Specifications

Voltage Ratings: 

 

AC: 

250 V (KLNR); 600 V (KLSR) 

 

DC: 

125 V (1 – 600 A KLNR); 

 

 

250 V (1 – 30 A KLSR); 

 

 

300 V (35 – 600 A KLSR).

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

DC: 

20 kA

Ampere Range:

 

1 – 600 A

Approvals:

 

AC: 

Standard 248-12, Class RK1 

 

 

UL Listed (File No. E81895) 

 

 

CSA Certified (File No. LR29862) 

 

DC: 

Littelfuse self-certified

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

18

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

www.littelfuse.com

1

Class RK1 F

uses

Fuses — UL Class RK1

CLaSS rK1 CUrrEnt Limiting EFFECtS

Short CirCUit 

CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

30 a

60 a

100 a

200 a

400 a

600 a

 5,000 

1,060

1,600

2,100

2,600

4,100

--

 10,000 

1,350

2,000

2,800

3,400

5,250

8,000

 15,000 

1,600

2,300

3,200

3,900

6,000

9,000

 20,000 

1,700

2,600

3,600

4,500

6,700

10,000

 25,000 

1,900

2,800

3,800

4,800

7,500

11,000

 30,000 

2,000

3,000

4,100

5,200

8,000

12,000

 35,000 

2,100

3,100

4,400

5,700

8,500

12,500

 40,000 

2,200

3,300

4,600

6,000

9,000

13,000

 50,000 

2,400

3,500

4,900

6,500

9,500

14,000

 60,000 

2,500

3,800

5,200

7,000

10,000

15,000

 80,000 

2,700

4,000

5,700

7,750

11,000

17,000

 100,000 

2,900

4,200

6,200

8,500

12,000

18,000

 150,000 

3,200

4,600

7,300

10,000

14,000

21,000

 200,000 

3,300

4,700

8,000

11,000

16,000

23,000

Visit 

www.littelfuse.com/llsrk

 for 600 V Current-Limiting effects

Current-Limiting Effects of LLSRK and LLSRK_ID (600 V) Fuses

Short CirCUit 

CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

30 a

60 a

100 a

200 a

400 a

600 a

 5,000 

900

1,400

2,000

2,700

4,800

5,000

 10,000 

1,100

1,900

2,700

3,500

6,200

8,500

 15,000 

1,250

2,100

3,100

4,200

7,000

9,500

 20,000 

1,400

2,400

3,500

4,600

8,000

10,800

 25,000 

1,500

2,600

3,900

5,000

8,300

11,500

 30,000 

1,600

2,800

4,000

5,250

9,000

12,000

 35,000 

1,700

2,850

4,300

5,500

9,500

12,500

 40,000 

1,800

3,000

4,600

5,800

9,800

13,500

 50,000 

1,900

3,200

4,800

6,300

10,200

14,000

 60,000 

2,000

3,500

5,200

6,700

11,000

15,000

 80,000 

2,200

3,900

5,700

7,200

12,200

16,000

 100,000 

2,300

4,000

6,000

8,100

12,700

17,000

 150,000 

2,500

4,500

6,700

9,100

14,000

19,000

 200,000 

2,600

4,800

7,000

9,700

15,000

20,000

*Prospective RMS Symmetrical Amperes Short-Circuit Current 

Visit 

www.littelfuse.com/llnrk

 for 250 V Current-Limiting effects 

Note: Data derived from Peak Let-thru Curves

Current-Limiting Effects of LLNRK (250 V) Fuses

Blown Fuse Indicator Assembly

Granular Quartz Filling

Precision Formed Short Circuit Element

Fiberglass Reinforced Pultruded Body

Elastomeric Silicone Overload Section

Plated End Caps

LLSRK_ID Fuses—Quality Construction 

for performance you can rely on…

Littelfuse 

LLSRK_ID

 Fuses feature true dual-element 

construction. This robust design withstands  
repeated surges within rated time delay  
without opening needlessly, eliminating  
needless downtime caused by power  
surges or equipment demands.

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

19

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class RK5 F

uses

Fuses — UL Class RK5

iDSr SEriES inDiCator

®

 Powr-Pro

® 

FUSES

 

 

     600 V AC/DC • Time-Delay • 

1

/

10

-600 Amperes

Ordering Information

amPErE ratingS

1

/

10 

6

/

10

1 

8

/

10

4

8

30

80

225

1

/

8

8

/

10

2

4 

1

/

2

9

35

90

250

15

/

100

1

2 

1

/

4

5

10

40

100

300

2

/

10

1 

1

/

8

2 

1

/

2

5 

6

/

10

12

45

110

350

1

/

4

1 

1

/

4

2 

8

/

10

6

15

50

125

400

3

/

10

1 

4

/

10

3

6 

1

/

4

17 

1

/

2

60

150

450

4

/

10

1 

1

/

2

3 

2

/

10

7

20

70

175

500

1

/

2

1 

6

/

10

3 

1

/

2

7 

1

/

2

25

75

200

600

Note: All fuses rated 1A and above are Indicator

®

 fuses.

Recommended Fuseholders

LFR60 Series ............................................................... pg. 90 
Additional information in Blocks & Holders section ..... pg. 90-94

Specifications

Voltage Ratings: 

 

 AC: 

600 V 

DC: 

600 V

Interrupting Ratings:

  AC: 

 200 kA rms symmetrical 

300 kA rms symmetrical 

(Littelfuse self-certified)

 

DC: 

20 kA

Ampere Range:

 

1

/

10

 – 600 A

Approvals:

 

 Standard 248-12 and UL 198M, Class RK5 

UL Listed (File No. E81895) 

CSA Certified (File No. LR29862)

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/idsr

Dimensions

Please refer to the Class R dimensions ....................... pg. 22

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

IDSR

30

IDSR30

IDSR030.t

Description

The IDSR combines a 600 VDC capability with indication to 
provide an ideal solution for many DC applications.

Applications

DC circuits

• 

Solar inverters

• 

Motors

• 

Transformers

• 

Solenoids

• 

Fluorescent lighting

• 

Features/Benefits

POWR-PRO Performance

• 

 (see pg. 3)

Indication

• 

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 21

100

1000

10000

100000

1000000

1

0

0

1

0

0

0

1

0

0

0

0

1

0

0

0

0

0

2

0

0

0

0

0

0

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

PE

AK

 LE

T-

TH

RU

 IN

 A

M

PE

RE

S

15 A

30 A

60 A

100 A

200 A

400 A

600 A

IDSR

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

20

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

www.littelfuse.com

1

Class RK5 F

uses

Fuses — UL Class RK5

FLnr_iD/FLSr_iD SEriES inDiCator

®

 FUSES

250/600 VAC • Dual Element • Time Delay • 

1

/

10

-600 Amperes

Description

Available in both Indicating and Non-Indicating versions, the 
FLNR/FLSR series of fuses sets the standard for general 
purpose fuses. The dual element design provides advanced 
short circuit and overload protection. FLSR series fuses 
provide excellent protection for all types of circuits especially 
those containing motors.

Applications

Service entrance switches

• 

Switchboard mains and feeders

• 

Motor control central mains and motor branch circuits

• 

All general purpose circuits

• 

Features/Benefits

Indication

• 

Dual element design

• 

Available without indication

• 

Current limiting

• 

Specifications

Voltage Ratings: 

 

AC: 

250 V (FLNR_ID); 600 V (FLSR_ID) 

 

DC: 

125 V (FLNR 

1

/

10

 – 30 A); 

 

 

125 V (FLNR_ID 35 – 600 A); 

 

 

300 V (FLSR_ID)

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

 

300 kA rms symmetrical 

 

 

(Littelfuse self-certified) 

 

DC: 

20 kA

Ampere Range:

 

1

/

10

 – 600 A

Approvals:

 

Standard 248-12, Class RK5 

 

UL Listed (File No. E81895) 

 

CSA Certified (File No. LR29862) 

 

Federal Specification WF-1814 

 

(QPL- W-F-1814)

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information:  

www.littelfuse.com/flsr 
www.littelfuse.com/flnr

amPErE ratingS

1

/

10 

6

/

10

1 

8

/

10

4

8

30

80

225

1

/

8

*

8

/

10

2

4 

1

/

2

9

35

90

250

15

/

100

1

2 

1

/

4

5

10

40

100

300

2

/

10

1 

1

/

8

2 

1

/

2

5 

6

/

10

12

45

110

350

1

/

4

1 

1

/

4

2 

8

/

10

6

15

50

125

400

3

/

10

†

1 

4

/

10

3

6 

1

/

4

17 

1

/

2

60

150

450

4

/

10

1 

1

/

2

3 

2

/

10

7

20

70

175

500

1

/

2

1 

6

/

10

3 

1

/

2

7 

1

/

2

25

75

**

200

600

*FLNR only. †FLNR, FLSR, FLSR_ID only. **FLNR, FLSR, FLSR_ID only   
Note: For 

1

/

10

 – 30A 250 volt fuses, order non-indicating FLNR series fuses.

Recommended Fuseholders

LFR60 Series ............................................................... pg. 90 
LFR25 Series ............................................................... pg. 90

Dimensions

Please refer to the Class R dimensions ....................... pg. 22

 

Refer to the FLNR Series dimensions for FLNR_ID,  
and FLSR dimensions for FLSR_ID.

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 21

Ordering Information

tyPE

VoLtagE SEriES amP CataLog 

nUmbEr

SyStEm 

nUmbEr

NON-INDICAtING

600 V

FLSR

15

FLSR015

FLSR015.t

INDICAtING

600 V

FLSR_ID

15

FLSR015ID

FLSR015.tXID

NON-INDICAtING

250 V

FLNR

60

FLNR060

FLNR060.t

INDICAtING

250 V

FLNR_ID

60

FLNR060ID FLNR060.tXID

QPL

FLSR_ID

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

21

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class RK5 F

uses

Fuses — UL Class  RK5

CLaSS rK5 CUrrEnt-Limiting EFFECtS

Short-CirCUit CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

30 a

60 a

100 a

200 a

400 a

600 a

5,000 

1,400

2,100

3,100

5,000

5,000

5,000

10,000 

1,550

2,500

3,900

6,500

9,500

10,000

15,000 

2,000

3,150

4,400

7,250

10,500

14,000

20,000 

2,250

3,400

5,000

8,250

12,000

16,000

25,000 

2,400

3,750

5,250

9,000

12,500

16,500

30,000 

2,550

4,100

5,600

9,500

13,500

18,000

35,000 

2,650

4,300

5,800

9,750

14,000

19,000

40,000 

2,800

4,400

6,250

10,250

15,000

20,000

50,000 

3,000

5,000

6,500

10,500

16,000

21,000

60,000 

3,200

5,250

7,000

11,500

17,000

23,000

80,000 

3,400

5,750

7,500

12,500

19,000

25,500

100,000 

3,850

6,000

8,000

13,500

21,000

27,500

150,000 

4,100

7,000

9,000

15,200

24,000

31,500

200,000 

4,300

7,500

9,750

16,500

26,000

34,000

Short-CirCUit CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

30 a

60 a

100 a

200 a

400 a

600 a

5,000 

1,250

2,100

3,200

5,000

5,000

5,000

10,000 

1,600

2,850

4,300

7,250

10,000

10,000

15,000 

1,800

3,400

5,000

8,500

13,500

15,000

20,000 

2,250

3,800

5,500

9,500

15,750

19,000

25,000 

2,450

4,100

5,700

10,250

17,000

21,000

30,000 

2,700

4,500

6,400

10,750

18,000

23,000

35,000 

2,900

4,800

6,700

11,500

19,000

24,250

40,000 

3,000

5,000

7,250

12,000

19,500

27,000

50,000 

3,400

5,250

7,750

13,000

21,000

29,000

60,000 

3,600

5,750

8,100

14,000

22,000

30,500

80,000 

3,900

6,250

9,000

15,000

24,000

33,000

100,000 

4,300

6,750

9,750

16,500

26,000

35,000

150,000 

4,500

7,600

11,100

19,000

28,000

38,000

200,000 

4,600

8,400

12,250

21,500

30,000

40,000

Current-Limiting Effects of FLNR and FLNR_ID (250V) Fuses

*Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Current-Limiting Effects of FLSR and FLSR_ID (600 V) Fuses

Short CirCUit 

CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

15 a

30 a

60 a

100 a

200 a

400 a

600 a

5,000 

800

1,100

2,100

3,200

5,000

5,000

5,000

10,000 

1,100

1,600

2,900

4,300

7,300

10,000

10,000

15,000 

1,300

1,900

3,400

5,000

8,600

13,700

15,000

20,000 

1,400

2,200

3,800

5,600

9,500

15,500

19,000

25,000 

1,500

2,500

4,100

6,100

10,300

16,700

21,500

30,000 

1,600

2,700

4,500

6,500

11,000

17,700

23,500

35,000 

1,700

2,900

4,700

6,800

11,600

18,600

25,200

40,000 

1,800

3,100

5,000

7,200

12,100

19,400

26,600

50,000 

1,900

3,400

5,400

7,800

13,100

20,800

29,500

60,000 

2,000

3,600

5,800

8,300

13,900

22,000

30,600

80,000 

2,200

4,000

6,300

9,100

15,400

24,000

33,200

100,000 

2,300

4,200

6,800

9,800

16,700

25,500

35,100

150,000 

2,600

4,500

7,700

11,200

19,300

28,100

38,000

200,000 

2,800

4,600

8,400

12,400

21,400

30,000

39,600

Current-Limiting Effects of IDSR (600 V) Fuses

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

22

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®

 Products Catalog

www.littelfuse.com

1

Class RK1/RK5 F

uses

Fuses — UL Class RK1/RK5

22

CLaSS r SEriES DimEnSionS

amPS

rEFEr  

to Fig. 

no.

SEriES

DimEnSionS in inChES (mm)

a

b

C

D

E

F

g

h

J

K

1

/

10

–30

1

LLNRK/ 

FLNR

2  (50.8)

1

⁄

2

  (12.7)

1

⁄

2

  (12.7)

9

⁄

16

  (14.3)

5

⁄

64

  (2.0)

5

⁄

32

  (4.0)

3

⁄

8

  (9.5)

 —

 —

 — 

LLSRK/ 

FLSR/ 

IDSR

5  (127.0)

3

⁄

4

  (19.1)

5

⁄

8

  (15.9)

13

⁄

16

  (20.6)

3

⁄

32

  (2.4)

3

⁄

16

  (4.8)

5

⁄

8

  (15.9)

 —

 —

 — 

35 – 60

1

LLNRK/ 

FLNR

3  (76.2)

3

⁄

4

  (19.1)

5

⁄

8

  (15.9)

13

⁄

16

  (20.6)

3

⁄

32

  (2.4)

3

⁄

16

  (4.8)

5

⁄

8 

  (15.9)

 —

 —

 — 

LLSRK/ 

FLSR/ 

IDSR

5

1

⁄

2

  (139.7)

1  (25.4)

5

⁄

8 

 (15.9)

1

1

⁄

16

  (27.0)

3

⁄

32

  (2.4)

1

⁄

4

  (6.4)

7

⁄

8  

(22.2)

 —

 —

 — 

70 – 100

2

LLNRK/ 

FLNR

5

7

⁄

8

  (149.2)

1  (25.4)

1

1

⁄

16

  (27.0)

1

1

⁄

16

  (27.0)

1

⁄

8

  (3.2)

3

⁄

4

  (19.1)

—

1

⁄

4

  (6.4)

9

⁄

32

  (7.1)

1

⁄

2

  (12.7)

LLSRK/ 

FLSR/ 

IDSR

7

7

⁄

8

  (200.0)

1

1

⁄

4

  (31.8)

1

1

⁄

16

  (27.0)

1

5

⁄

16

  (33.3)

1

⁄

8

  (3.2)

3

⁄

4

  (19.1)

—

1

⁄

4

  (6.4)

9

⁄

32

  (7.1)

1

⁄

2

  (12.7)

110 – 200

2

LLNRK/ 

FLNR

7

1

⁄

8

  (181.0)

1

1

⁄

2

  (38.1)

1

15

⁄

32

  (37.3) 1

19

⁄

32

  (40.5)

3

⁄

16

  (4.8)

1

1

⁄

8

  (28.6)

—

7

⁄

16

  (11.1)

9

⁄

32

  (7.1)

11

⁄

16

  (17.5)

LLSRK/ 

FLSR/ 

IDSR

9

5

⁄

8

  (244.5)

1

3

⁄

4

  (44.5)

1

15

⁄

32

  (37.3) 1

27

⁄

32

  (46.8)

3

⁄

16

  (4.8)

1

1

⁄

8

  (28.6)

—

7

⁄

16

  (11.1)

9

⁄

32

  (7.1)

11

⁄

16

  (17.5)

225 – 400

2

LLNRK/ 

FLNR

8

5

⁄

8

  (219.1)

2  (50.8)

1

15

⁄

16

  (49.2)

2

3

⁄

32

  (53.2)

1

⁄

4

  (6.4)

1

5

⁄

8

  (41.3)

—

5

⁄

8

  (15.9)

13

⁄

32

  (10.3)

15

⁄

16

  (23.8)

LLSRK/ 

FLSR/ 

IDSR

11

5

⁄

8

  (295.3)

2

1

⁄

2

  (63.5)

2  (50.8)

2

19

⁄

32

  (65.9)

1

⁄

4

  (6.4)

1

5

⁄

8

  (41.3)

—

5

⁄

8

  (15.9)

13

⁄

32

  (10.3)

15

⁄

16

  (23.8)

450 – 600

2

LLNRK/ 

FLNR

10

3

⁄

8

  (263.5)

2

1

⁄

2

  (63.5)

2

3

⁄

8

  (60.3)

2

19

⁄

32

  (65.9)

1

⁄

4

  (6.4)

2  (50.8)

—

3

⁄

4

  (19.1)

17

⁄

32

  (13.5)

1

1

⁄

8

  (28.6)

LLSRK/ 

FLSR/ 

IDSR

13

3

⁄

8

  (339.7)

3  (76.2)

2

13

⁄

32

  (61.1)

3

3

⁄

32

  (78.6)

1

⁄

4

  (6.4)

2  (50.8)

—

3

⁄

4

  (19.1)

17

⁄

32

  (13.5)

1

1

⁄

8

  (28.6)

A

F

E

C

D

G

B

A

J

K

H

B

C

F

D

70-600A

FIG. 1

FIG. 2

E

Dimensions in inches (mm)

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

23

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®

 Products Catalog

1

SPFR Solar F

use

Fuses — SPFR Solar Inverter

SPFr SEriES 1000 VDC high-amPEragE SoLar FUSES

1000 VDC • Fast-Acting • 250-400 Amperes

Specifications

Voltage Rating:

 

1000 VDC 

Ampere Ratings:

 

250, 300, 350 and 400 A

Interrupting Rating:

 

10,000 A; time Constant less than 1ms

Fuse Type:

 

Fast-Acting

Approvals:

 

UL Recognized 1000 VDC UL 248

 

(File No. 71611)

 

CSA Certified (File No. 29862)

Ordering Information

298.806

[11.764

189.941

[7.478

Dimensions in mm (inches)

CataLog nUmbEr

SyStEm nUmbEr

amPEragE

SPFR 250

SPFR250.X

250

SPFR 300

SPFR300.X

300

SPFR 350

SPFR350.X

350

SPFR 400

SPFR400.X

400

Recommended Fuseholders

SPFRHV Series .......................................................... pg. 106

Description

The SPFR series was designed to meet the growing needs 
of the solar industry with higher amperage and voltage 
requirements. It was developed specifically for solar 
applications ranging from 250 A to 400 A.

Applications

Solar inverters

• 

High-amperage combiner boxes

• 

Features/Benefits

DC voltage rating meets European system requirements 

• 

and North American utility scale requirements
Multiple amperage ratings

• 

UL Class H Dimensions

• 

Full range protection

• 

Web Resources

Downloadable CAD drawings and other technical information: 

www.littelfuse.com/spfr

Look for this logo to indicate products that are used in solar applications.  

Visit our website 

www.littelfuse.com/green

 for the latest updates on  

approvals, certifications, codes and standards.

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

24

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®

 Products Catalog

www.littelfuse.com

1

Class K/H F

uses

Fuses — UL Class K5

nLn/nLS SEriES (onE-timE) FUSES

250/600 VAC • “One-Time” • 1-600 Amperes

amPErE ratingS

1

7

*25

*60

125

300

2

8

*30

70

150

350

3

10

*35

80

175

400

4

12

*40

90

200

450

5

*15

*45

100

225

500

6

*20

*50

110

250

600

*NLKP series available only in those amperages preceded by an asterisk.

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information:  

www.littelfuse.com/nln 
www.littelfuse.com/nls 
www.littelfuse.com/nlkp

Recommended Fuseholders

LFH60 Series ............................................................... pg. 90 
LFH25 Series ............................................................... pg. 89

Dimensions

Please refer to the Class K/H dimensions ................... pg. 26

Ordering Information

SEriES

amPEragE

CataLog nUmbEr

SyStEm nUmbEr

NLS

20

NLS020

0NLS020.t

NLN

15

NLN015

0NLN015.t

Description

NLN/NLS fuses provide low cost protection for general 
purpose feeder and branch circuits when available short 
circuit currents are less than 50 kA.

Canadian Electrical Code NLKP Type P fuse available. See Web Resources 
links for more information.

Applications

General purpose residential and commercial circuits with 

• 

little or no motor load.

Features/Benefits

Economical

• 

50 kA interrupting rating

• 

Indicating and 

• 

DIN mount holders available

Specifications

Voltage Ratings: 

 

AC: 

250 V 

(NLN) 

 

 

 

600 V 

(NLS) 

 

 

DC: 

250 V  

(NLN) 

 

 

 

400 V  

(NLS 35 – 60 A) 

 

 

 

500 V  

(NLS 8 – 30 A) 

 

 

 

 

 

(NLS 225 – 600 A) 

 

 

 

600 V 

(NLS 1 – 7 A) 

 

 

 

 

 

(NLS 70 – 200 A)

Interrupting Ratings:

  AC: 

50 kA rms symmetrical 

 

 

 

(NLN/NLS) 

 

 

DC: 

 20 kA (NLN/NLS 1 – 60 A) 

50 kA (NLN/NLS 70 – 600 A)

Ampere Range:

 

1 – 600 amperes (NLN/NLS)

Approvals:

 

NLN/NLS:   Standard 248-9, Class K5 

UL Listed (File No. E81895) 

CSA Certified (File No. LR29862)

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

25

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 Products Catalog

1

Class K/H F

uses

Fuses — UL Class H

25

rLn/rLS SEriES rEnEwabLE FUSES anD LKn/LKS SEriES LinKS   

250/600 VAC • Renewable • 1-600 Amperes

Description

Littelfuse RLN and RLS series renewable fuses are a quality 
product that have traditionally been used to provide low cost 
protection of general purpose feeder and branch circuits 
where available short-circuit currents do not exceed 10,000 
amperes. However, generally increased levels of available 
fault current and the distinct possibility that renewable  
fuses may be improperly renewed, have rendered them 
unsafe. The use of these fuses in new applications is 
prohibited by law.

Applications

General purpose residential and commercial circuits with 

• 

little or no motor load.
Replacement only

• 

Features/Benefits

Replaceable fuse links

• 

10 kA Interrupting Rating

• 

Specifications

Voltage Ratings: 

 

AC: 

250 V (RLN); 600 V (RLS)

Interrupting Ratings:

  AC: 

10 kA rms symmetrical

Ampere Range:

 

1 – 600 A

Approvals:

 

 Standard 248-6, Class H 

UL Listed (File No. E81895) 

CSA Certified (File No. LR29862)

Fuse Links:

 

 to order, specify LKN (250V) or LKS (600V) plus  

ampere rating.

*RLS only. 
†these ampere ratings require two links per fuse. 

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information:   

www.littelfuse.com/rln 
www.littelfuse.com/rls

Recommended Fuseholders

LFH60 Series ............................................................... pg. 90 
LFH25 Series ............................................................... pg. 89

Dimensions

Please refer to the Class K/H dimensions ................... pg. 26

amPErE ratingS

1

6

20

45

90

175

350

†

2

8*

25

50

100

200

400

†

3

10

30

60

110

225

†

450

†

4

12*

35

70

125

250

†

500

†

5

15

40

80

150

300

†

600

†

Ordering Information

tyPE

VoLtagE

CataLog nUmbEr

SyStEm nUmbEr

FUSE

600

RLS020

0RLS020.t

FUSE

250

RLN020

0RLN020.t

LINK

600

LKS025

0LKS025.S

LINK

250

LKN030

0LKN030.S

Still using Class H fuses?

Littelfuse offers several fuse and fuseblock combinations 
that can greatly improve electrical safety.
LLNRK/LLSRK .............................................................. pg. 16 
FLNR/FLSR fuses ........................................................ pg. 20 
LFR fuseholders ..................................................... pg. 88-94

Renewable Fuse Guide for Proper Usage 

Renewable fuses should only be used where short-circuit 

• 

currents are known to be less than 10,000 amperes, and 
where correct replacement of open links is assured.
Renewable fuses and links are not recommended for 

• 

new applications.

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

26

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®

 Products Catalog

www.littelfuse.com

1

Class K/H F

uses

Fuses — UL Class K/H

CLaSS K/h DimEnSionS

A

C

C

D

A

E

B

B

F D

G

FIG. 1

FIG. 2

amPErES

rEFEr to

Fig. no.

SEriES

DimEnSionS in inChES (mm in ParEnthESES)

A

B

C

D

E

F

G

1 – 30

1

NLN/RLN

2  (50.8)

1

⁄

2

  (12.7)

1

⁄

2

  (12.7)

9

⁄

16

  (14.3)

—

—

—

NLS/RLS

5  (127.0)

3

⁄

4

  (19.1)

5

⁄

8

  (15.9)

13

⁄

16

  (20.6)

—

—

—

35 – 60

1

NLN/RLN

3  (76.2)

3

⁄

4

  (19.1)

5

⁄

8

  (15.9)

13

⁄

16

  (20.6)

—

—

—

NLS/RLS

5

1

⁄

2

  (139.7)

1  (25.4)

5

⁄

8

  (15.9)

1

1

⁄

16

  (27.0)

—

—

— 

70 – 100

2

NLN/RLN

5

7

⁄

8

  (149.2)

1  (25.4)

1  (25.4)

1

1

⁄

16

  (27.0)

1

⁄

8

  (3.2)

3

⁄

4

  (19.1)

1

5

⁄

16

 (33.3)

NLS/RLS

7

7

⁄

8

  (200.0)

1

1

⁄

4

  (31.8)

1  (25.4)

1

5

⁄

16

  (33.3)

1

⁄

8

  (3.2)

3

⁄

4

  (19.1)

1

9

⁄

16

  (39.7)

110 – 200

2

NLN/RLN

7

1

⁄

8

  (181.0)

1

1

⁄

2

  (38.1)

1

3

⁄

8

  (34.9)

1

9

⁄

16

  (39.7)

3

⁄

16

  (4.8)

1

1

⁄

8

  (28.6)

1

7

⁄

8

  (47.6)

NLS/RLS

9

5

⁄

8

  (244.5)

1

3

⁄

4

  (44.5)

1

3

⁄

8

  (34.9)

1

27

⁄

32

  (46.8)

3

⁄

16

  (4.8)

1

1

⁄

8

  (28.6)

2

3

⁄

32

  (53.2)

225 – 400

2

NLN/RLN

8

5

⁄

8

  (219.1)

2  (50.8)

1

7

⁄

8

  (47.6)

2

3

⁄

32

  (53.2)

1

⁄

4

  (6.4)

1

5

⁄

8

  (41.3)

2

13

⁄

32

  (61.1)

NLS/RLS

11

5

⁄

8

  (295.3)

2

1

⁄

2

  (63.5)

1

7

⁄

8

  (47.6)

2

19

⁄

32

  (65.9)

1

⁄

4

  (6.4)

1

5

⁄

8

  (41.3)

2

7

⁄

8

  (73.0)

450 – 600

2

NLN/RLN

10

3

⁄

8

  (263.5)

2

1

⁄

2

  (63.5)

2

1

⁄

4

  (57.2)

2

19

⁄

32

  (65.9)

1

⁄

4

  (6.4)

2  (50.8)

2

7

⁄

8

  (73.0)

NLS/RLS

13

3

⁄

8

  (339.7)

3  (76.2)

2

1

⁄

4

  (57.2)

3

3

⁄

32

  (78.6)

1

⁄

4

  (6.4)

2  (50.8)

3

7

⁄

16

  (87.3) 

Dimensions in inches (mm)

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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 Products Catalog

1

Class J F

uses

Fuses — UL Class J

JtD_iD SEriES inDiCator

®

 Powr-Pro

®

 FUSES

 

               600 VAC  •  Time Delay  • 

8

/

10

-600 Amperes

amPErE ratingS

8

⁄

10

2

1

⁄

4

4

1

⁄

2

10

35

90

225

600

1

2

1

⁄

2

5

12

40

100

250

1

1

⁄

4

2

8

⁄

10

5

6

⁄

10

15

45

110

300

1

1

⁄

2

3

6

17

1

⁄

2

50

125

350

1

6

⁄

10

3

2

⁄

10

7

20

60

150

400

1

8

⁄

10

3

1

⁄

2

8

25

70

175

450

2

4

9

30

80

200

500

Description

The Littelfuse POWR-PRO JTD_ID Indicator Class J fuse 
provides visual blown fuse indication and maximum protection 
in a compact package. The current-limiting time delay JTD_ID 
offers a patented design which reduces nuisance fuse openings.

Applications

Fused combination motor controllers and motor  

• 

control centers
Transformer protection

• 

Protection for series rated molded case  

• 

circuit-breaker panels
General purpose circuits 

• 

Features

Current-Limiting

• 

IEC Type 2 Protection

• 

Indication and non-indication version available

• 

POWR-PRO Performance (see pg. 3) 

• 

Indicating and 

• 

DIN mount holders available

Specifications

Voltage Ratings:  

AC

: 

600 V

  

 

 

DC: 

300 V (

8

⁄

10 

–100 A); 500 V (110–600 A)

Interrupting Rating:

  AC: 

 200

 

kA rms symmetrical 

300

 

kA rms symmetrical

 

 

DC: 

 20

 

kA

Ampere Range:

 

8

⁄

10

–600 A

Approvals:  

AC: 

Standard 248-8, Class J  

 

 

 

UL Listed (File No. E81895)

 

 

 

CSA Certified (File No. LR29862) 

 

 

DC: 

Littelfuse self-certified

1000000

100000

10000

1000

1000

10000

100000 200000

100

100

600 A

400 A
200 A

100 A

60 A
30 A

15 A

12 A

5.6 A

AVAILABLE FAULT

SYMMETRICAL R.M.S. AMPERES

PEAK LET

-THRU IN 

AMPERES

Note: For more information, see Peak Let-Thru Table on pg. 29

Web Resources  

Time-current curves, data sheets and additional technical 
information:  

www.littelfuse.com/jtd

Recommended Fuseholders

LFJ60 Series ................................................................ pg. 85 
LPSJ Series ................................................................pg. 114 

Dimensions

Please refer to the Class J dimensions ....................... pg. 29

Peak Let-Thru Curve

tyPE

SEriES amPEragE CataLog 

nUmbEr

SyStEm 

nUmbEr

INDICAtING

JtD_ID

60

JtD60ID

0JtD060.tXID

NON-INDICAtING

JtD

60

JtD60

0JtD060.t

Ordering Information

JTD_ID

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

28

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

www.littelfuse.com

1

Class J F

uses

Fuses — UL Class J

JLS SEriES FUSES

600 VAC  •  Fast-Acting  •  1-600 Amperes

amPErE ratingS

1

20

45

90

175

350

3

25

50

100

200

400

6

30

60

110

225

450

10

35

70

125

250

500

15

40

80

150

300

600

Description

JLS series fuses provide space saving, fast-acting overload 
and short-circuit protection for non-inductive loads. For 
ap pli ca tions where short-duration surg es and spikes may 
cause nuisance fuse opening, consider the use of Littelfuse 
POWR-PRO

®

 JTD or JTD_ID series time-delay fuses.

Applications

General purpose circuits with little or no motor load.

• 

Resistive loads, such as resistance electric heat.

• 

Loads requiring fast-acting overload protection, such as 

• 

equipment containing solid-state devices.

Specifications

Voltage Ratings:

 

 

600 VAC

Interrupting Ratings:

 

200

 

kA rms symmetrical

Ampere Range:

 

 

1–600 A

Approvals:

 

 

Standard 248-8, Class J 

   

 

 

UL Listed (File No. E81895) 

   

 

 

CSA Certified (File No. LR29862) 

   

 

 

Federal Specification WF-1814 

   

 

 

(QPL-W-F-1814)

10000

100000

200000

100

1000

100

1000

10000

100000

1000000

600 A
400 A

200 A
100 A

60 A

30 A

PEAK LET

-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL  R. M. S.  AMPERES

Dimensions

Please refer to the Class J dimensions ....................... pg. 29

tyPE

SEriES amPEragE

CataLog 

nUmbEr

SyStEm 

nUmbEr

NON-INDICAtING

JLS

110

JLS110

0JLS110.X

Ordering Information

Web Resources

TC curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/jls

Recommended Fuseholders

LFJ60 Series ................................................................ pg. 85 
LPSJ Series ................................................................pg. 114

Peak Let-Thru Curve

QPL

JLS

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

29

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class J F

uses

Fuses — UL Class J

29

CLaSS J DimEnSionS anD CUrrEnt-Limiting EFFECtS

A

C

D

G

F

E

H

A

B

C

D

Fig. 1

Fig. 2

Dimensions in inches (mm)

Current-Limiting Effects of JTD_ID (600 V) Fuses

Short CirCUit 

CUrrEnt

†

aPParEnt rmS Sym mEt ri CaL CUrrEnt For VarioUS FUSE ratingS

15 a

30 a

60 a

100 a

200 a

400 a

600 a

5,000

565

750

1,500

1,800

2,800

4,800

5,000

10,000

675

925

1,900

2,450

3,600

5,700

7,750

15,000

775

1,050

2,100

2,800

4,100

6,500

9,000

20,000

825

1,125

2,300

3,000

4,400

7,250

9,700

25,000

900

1,200

2,500

3,300

5,000

8,000

10,500

30,000

950

1,300

2,600

3,500

5,100

8,400

11,000

35,000

1,000

1,350

2,700

3,700

5,400

9,000

12,000

40,000

1,050

1,400

2,800

3,900

5,600

9,200

12,500

50,000

1,100

1,500

3,000

4,200

6,000

10,000

13,000

60,000

1,200

1,600

3,200

4,500

6,400

10,500

14,000

80,000

1,300

1,700

3,400

4,900

7,200

11,200

15,500

100,000

1,375

1,800

3,600

5,200

7,800

12,200

16,500

150,000

1,500

2,000

3,950

6,000

9,000

14,500

19,000

200,000

1,600

2,175

4,000

6,500

10,000

16,000

20,500

†Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

*70-100 A JLS dimension = 1  (25.4)

amPErES

rEFEr to  

Fig. no.

DimEnSionS in inChES (mm)

a

b

C

D

E

F

g

h

1 – 30

1

2

1

⁄

4

  (57.2)

—

1

⁄

2

  (12.7)

13

⁄

16

  (20.6)

—

—

—

— 

35 – 60

1

2

3

⁄

8

  (60.3)

—

5

⁄

8

  (15.9)

1

1

⁄

16

  (27.0)

—

—

—

— 

70 – 100

2

2

5

⁄

8

  (66.7)

3

17

⁄

32

  (89.7)

3

23

⁄

32

  (94.5)

4

5

⁄

8

  (117.5)

1

1

⁄

8

  (28.6)*

3

⁄

4

  (19.1)

9

⁄

32

  (7.1)

1

⁄

8

  (3.2)

110 – 200

2

3  (76.2)

4

9

⁄

32

  (108.7)

4

15

⁄

32

  (113.5)

5

3

⁄

4

  (146.1)

1

1

⁄

2

  (38.1)

1

1

⁄

8

  (28.6)

9

⁄

32

  (7.1)

3

⁄

16

  (4.8)

225 – 400

2

3

3

⁄

8

  (85.7)

5

1

⁄

8

  (130.2)

5

3

⁄

8

  (136.5)

7

1

⁄

8

  (181.0)

2  (50.8)

1

5

⁄

8

  (41.3)

13

⁄

32

  (10.3)

1

⁄

4

  (6.4)

450 – 600

2

3

3

⁄

4

  (95.3)

5

27

⁄

32

  (148.4)

6

5

⁄

32

  (156.4)

8  (203.2)

2

1

⁄

2

  (63.5)

2  (50.8)

17

⁄

32

  (13.5)

3

⁄

8

  (9.5)

Dimensions JTD_ID, JTD and JLS

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

30

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

www.littelfuse.com

1

Class 

T F

uses

Fuses — UL Class T

JLLn/JLLS CLaSS t FUSES   

300/600 VAC • Fast-Acting • 1-600 Amperes

Description

JLLN/JLLS fuses are less than 

1

/

3

 the size of comparable 

Class R fuses and are typically used for short circuit 
protection of drives and surge sensitive components. When 
rated in accordance with the NEC

®

, JLLN/JLLS fuses provide 

fast-acting overload and short circuit protection for non-
inductive circuits and equipment.

Applications

Variable speed drive protection 

• 

Compact mains switches

• 

Features/Benefits

Extremely current-limiting

• 

Compact design

• 

200 kA Interrupting Rating

• 

JLLN Series is RoHS Compliant

• 

Specifications

Voltage Ratings: 

 

 AC: 

300 V  (JLLN); 600 V (JLLS) 

DC: 

 125 V  (JLLN 1 – 30 A) 

160 V  (JLLN 35 – 60 A) 

125 V  (JLLN 70 – 100 A)  

125 V  (JLLN 110 – 1200 A) 

300 V  (JLLS)

Interrupting Ratings:

   AC: 

200 kA rms symmetrical 

DC: 

 20 kA 

(JLLN 70 – 100 A)  

(JLLN 110 – 1200 A) 

(JLLS 1 – 1200 A)

Ampere Range:

 

1 – 1200 A

Approvals:

 

AC: 

 Standard 248-15, Class t 

UL Listed (File No. E81895): 

JLLN (1-1200 A) 

JLLS (1-800 A) 

UL Recognized (File No. E71611) 

JLLS (900 – 1200 A) 

CSA Certified (File No. LR29862) 

JLLN/JLLS (1 – 600 A)

 

 

DC: 

 UL Listed (File No. E81895): 

JLLN (35 – 1200 A) 

JLLN (110 – 1200 A) 

Littelfuse self-certified:  JLLN 1-30 A 

JLLS (1 – 1200 A)

amPErE ratingS

1

30

90

250

800

2

35

100

300

900*

3

40

110

350

1000

6

45

125

400

1100

10

50

150

450

1200

15

60

175

500

20

70

200

600

25

80

225

700

*JLLS only

Note: Contact the factory for RoHS compliant Class T fuses.

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information:  

www.littelfuse.com/jlln 
www.littelfuse.com/jlls

Recommended Fuseholders

LFT30 Series ................................................................ pg. 95 
LFT60 Series ................................................................ pg. 95 
LSCR Series for 700-800 A ........................................ pg. 120

Dimensions

Please refer to the Class T dimensions ........................ pg. 31

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 31

Ordering Information

SEriES

VoLtagE

amPEragE

CataLog 

nUmbEr

SyStEm 

nUmbEr

JLLS

600 V

6

JLLS006

JLLS006.t

JLLN

300 V

10

JLLN010

JLLN010.t

JLLS

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

31

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class 

T F
uses

Fuses — UL Class T

CLaSS t DimEnSionS anD CUrrEnt-Limiting EFFECtS

B

C

A

F

D

F

E

A

B

C

D

G

A

C

D

Fig. 1

Fig. 2

Fig. 3

Current-Limiting Effects of JLLS (600 V) fuses

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 

750

1,225

1,400

2,850

4,600

5,000

5,000

5,000

 10,000 

945

1,525

1,700

3,600

6,000

8,500

9,400 10,000

 15,000 

1,050 1,700

2,000

4,050

6,600

9,750 10,500 13,000

 20,000 

1,150 1,900 2,200

4,450

7,250 10,500 11,000 14,750

 25,000 

1,300 2,050 2,400

4,800

8,000 11,500 12,500 15,500

 30,000 

1,375 2,150

2,450

5,000

8,250 12,000 13,750 16,500

 35,000 

1,400 2,250 2,600

5,100

8,500 13,000 14,000 17,000

 40,000 

1,425 2,400 2,800

5,200

8,700 14,000 14,750 18,000

 50,000 

1,600 2,450 2,900

6,000

9,500 14,500 16,000 20,000

 60,000 

1,650 2,625

3,100

6,250 10,000 15,500 17,300 21,000

 80,000 

1,825 2,800 3,400

7,000 11,000 17,000 18,750 23,000

 100,000 

2,000 3,100

3,700

7,250 12,000 18,000 20,000 25,000

 150,000 

2,250 3,400 4,300

8,500 13,000 21,000 23,000 28,500

 200,000 

2,450 3,800 4,600

9,000 15,000 23,000 25,000 31,000

*Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Current-Limiting Effects of JLLN (300 V) fuses

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

amPErES rEFEr to

Fig. no.

SEriES

DimEnSionS in inChES (mm)

a

b

C

D

E

F

g

1 – 30

1

JLLN

7

⁄

8

  (22.2)

—

9

⁄

32

  (7.1)

13

⁄

32

  (10.3)

—

—

—

JLLS

1

1

⁄

2

  (38.1)

—

9

⁄

32

  (7.1)

9

⁄

16

  (14.3)

—

—

—

35 – 60

1

JLLN

7

⁄

8

  (22.2)

—

9

⁄

32

  (7.1)

9

⁄

16

  (14.3)

—

—

— 

2

JLLS

1

9

⁄

16

  (39.7)

13

⁄

16

  (20.6)

13

⁄

32

  (10.3)

1  (25.4)

1

⁄

16

  (1.6)

1

3

⁄

32

  (27.8)

—

70 – 100

3

JLLN

2

5

⁄

32

  (54.8)

1

9

⁄

16

  (39.7)

3

⁄

4

  (19.1)

13

⁄

16

  (20.6)

27

⁄

32

  (21.4)

9

⁄

32

  (7.1)

1

⁄

8

  (3.2)

JLLS

2

61

⁄

64

  (75.0)

2

23

⁄

64

  (59.9)

3

⁄

4

  (19.1)

13

⁄

16

  (20.6)

1

41

⁄

64

  (41.7)

9

⁄

32

  (7.1)

1

⁄

8

  (3.2)

110 – 200

3

JLLN

2

7

⁄

16

  (61.9)

1

11

⁄

16

  (42.9)

7

⁄

8

  (22.2)

1

1

⁄

16

  (27.0)

27

⁄

32

  (21.4)

11

⁄

32

  (8.7)

3

⁄

16

  (4.8)

JLLS

3

1

⁄

4

  (82.6)

2

1

⁄

2

  (63.5)

7

⁄

8

  (22.2)

1

1

⁄

16

  (27.0)

1

21

⁄

32

  (42.1)

11

⁄

32

  (8.7)

3

⁄

16

  (4.8)

225 – 400

3

JLLN

2

3

⁄

4

  (69.9)

1

27

⁄

32

  (46.8)

1  (25.4)

1

5

⁄

16

  (33.3)

53

⁄

64

  (21.0)

13

⁄

32

  (10.3)

1

⁄

4

  (6.4)

JLLS

3

5

⁄

8

  (92.1)

2

23

⁄

32

  (69.1)

1  (25.4)

1

19

⁄

32

  (40.5)

1

23

⁄

32

  (43.7)

13

⁄

32

  (10.3)

1

⁄

4

  (6.4)

450 – 600

3

JLLN

3

1

⁄

16

  (77.8)

2

1

⁄

32

  (51.6)

1

1

⁄

4

  (31.8)

1

19

⁄

32

  (40.5)

7

⁄

8

  (22.2)

31

⁄

64

  (12.3)

5

⁄

16

  (7.9)

JLLS

3

63

⁄

64

  (101.2)

2

61

⁄

64

  (75.0)

1

1

⁄

4

  (31.8)

2

1

⁄

16

  (52.4)

1

49

⁄

64

  (44.8)

31

⁄

64

  (12.3)

5

⁄

16

  (7.9)

700 – 800

3

JLLN

3

3

⁄

8

  (85.7)

2

7

⁄

32  

(64.3)

1

3

⁄

4

  (44.5)

2

1

⁄

16

  (52.4)

7

⁄

8

  (22.2)

35

⁄

64

  (13.9)

3

⁄

8

  (9.5)

JLLS

4

21

⁄

64

  (109.9)

3

11

⁄

64

  (80.6)

1

3

⁄

4

  (44.5)

2

1

⁄

2

  (63.5)

1

55

⁄

64

  (47.2)

35

⁄

64

  (13.9)

3

⁄

8

  (9.5)

900 – 1200

3

JLLN

4  (101.6)

2

17

⁄

32

  (64.3)

2  (50.8)

2

1

⁄

2

  (63.5)

1

1

⁄

32

  (26.2)

39

⁄

64

  (15.5)

7

⁄

16

  (11.1)

JLLS

5.27  (133.9)

3.80  (96.5)

2  (50.8)

2.63  (66.8)

2.30  (58.4)

0.67  (15.5)

0.44  (11.2)

Dimensions in inches (mm)

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

32

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

www.littelfuse.com

1

Class G F

uses

Fuses —UL Class G

SLC CLaSS g FUSES     

480/600 VAC • Time-Delay • 

1

/

2

-60 Amperes

amPErE ratingS

1

/

2

3

6

12

25

40

60

1

4

8

15

30

45

2

5

10

20

35

50

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/slc

Recommended Fuseholders

LG300 Series ............................................................. pg. 100 
L30030G Series ......................................................... pg. 100

A

B

C

D

amPErES rEFEr to 

Fig. no.

DimEnSionS in inChES (mm )

a

b

C

D

1

/

2

 – 15

1

1 

5

/

16

 (33.3)

3

/

8

 (9.5)

9

/

32

 (7.1)

13

/

32

 (10.3)

20

1

1 

13

/

32

 (35.7)

3

/

8

 (9.5)

9

/

32

 (7.1)

13

/

32

 (10.3)

25, 30

1

1 

5

/

8

 (41.3)

3

/

8

 (9.5)

9

/

32

 (7.1)

13

/

32

 (10.3)

35 – 60

1

2 

1

/

4

 (57.2)

3

/

8

 (9.5)

1

/

2

 (12.7)

13

/

32

 (10.3)

Dimensions in inches (mm)

Ordering Information

SEriES

amPEragE CataLog nUmbEr SyStEm nUmbEr

SLC

10

SLC010

0SLC010.t

Description

Littelfuse SLC fuses provide cost effective branch circuit 
protection. Fuse length varies to prevent over-fusing. 
Compact Class G fuses were the first fuse series to 
approach midget fuse dimensions and meet NEC

®

 

requirements for branch-circuit protection. 

Applications

Branch circuit protection

• 

Features/Benefits

Branch circuit rated

• 

Current-limiting

• 

100 kA interrupting rating

• 

600 VAC rated 

• 

1

/

2

-20 A

Specifications

Voltage Ratings: 

 

600 VAC (

1

/

2

 – 20 A) 

 

 

480 VAC (25 – 60 A) 

 

 

170 VDC (

1

/

2

 – 30 A) (Littelfuse self-certified)

Interrupting Ratings:

  AC:  100 kA rms symmetrical 

 

 

DC:  10 kA

Ampere Range:

 

1

/

2

 – 60 A

Approvals:

 

Standard 248-5, Class G 

 

 

UL Listed (File No. E81895) 

 

 

CSA Certified (File No. LR29862) 

 

 

Federal Specification WF-1814 

 

 

(QPL-W-F-1814) 

QPL

Fig  1

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

33

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class CC/CD F

uses

Fuses — UL Class CC/CD

CCmr SEriES Powr-Pro

®

 FUSES

 

 

      600 VAC • Dual Element • Time-Delay • 

2

/

10

-60 Amperes

amPErE ratingS

2

/

10

1

2

3 

1

/

2

6 

1

/

4

12

35

1

/

4

1 

1

/

4

2 

1

/

4

4

7

15

40

3

/

10

1 

4

/

10

2 

1

/

2

4 

1

/

2

7 

1

/

2

17 

1

/

2

45

1

/

2

1 

1

/

2

2 

8

/

10

5

8

20

50

6

/

10

1 

6

/

10

3

5 

6

/

10

9

25

60

8

/

10

1 

8

/

10

3 

2

/

10

6

10

30

Web Resources

TC Curves, downloadable CAD drawings and other technical 
information: 

www.littelfuse.com/ccmr

Recommended Fuseholders

LPSC Series ............................................................... pg. 108 
L60030C Series ..........................................................pg. 101 
L60060C Series ..........................................................pg. 101

Dimensions

Please refer to the Class CC/CD dimensions .............. pg. 35

Note: For more information, see Peak Let-Thru Table on pg. 35

Peak Let-Thru Curve

Ordering Information

SEriES

amPEragE CataLog nUmbEr SyStEm nUmbEr

CCMR

45

CCMR045

CCMR045.t

* Consult Motor Protection tables on pg. 203 in the technical Application Guide 

section for specific motor sizing information.

CCMR

Description

The CCMR series is ideal for space saving protection 
of motors up to 40 hp*. It was designed specifically to 
withstand sustained starting currents of small motors. The 
CCMR 60 fuse is the smallest 60 A fuse available rated at  
600 V. Compared to other UL Listed fuses, Class CC fuses 
are the most current-limiting, rating for rating.

Applications

Motor and motor branch circuit protection

• 

Features/Benefits

POWR-PRO Performance (see pg. 3)

• 

Extremely current-limiting

• 

Ratings up to 60 Amps

• 

300 kA Interrupting Rating (self-certified)

• 

Specifications

Voltage Ratings: 

 

AC: 

600 V 

 

DC: 

250 V  (CCMR 

2

/

10

– 2 A) 

 

 

 

(CCMR 4

1

/

2

– 10 A) 

 

 

 

(CCMR 35– 60 A) 

 

 

300 V  (CCMR 2

1

/

4

– 4 A) 

 

 

500 V  (CCMR 12– 30 A)

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

 

300 kA Littelfuse self-certified 

 

DC: 

20 kA

Ampere Range:

 

 

2

/

10

 – 60 A

Approvals:

 

AC: 

Standard 248-4, Class CC 

 

 

UL Listed 

1

/

10

-30 A (File No. E81895) 

 

 

Standard 248, Class CD 

 

 

UL Listed 35-60 A (File No. E81895) 

 

 

CSA Certified 

1

/

10

-30 A 

 

 

(File No. LR29862) 

 

DC: 

Littelfuse self-certified 

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

34

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

www.littelfuse.com

1

Class CC/CD F

uses

Fuses — UL Class CC

CLaSS CC FUSES

KLKR Series

600 VAC/300 VDC • Fast-Acting • 

1

/

10

-30 Amperes

KLDR Series

600 VAC/300 VDC • Time-Delay • 

1

/

10

-30 Amperes

Description

KLDR fuses are time-delay fuses designed to  
protect control transformers, so le noids and similar 
inductive com ponents with high mag ne tiz ing  
currents during the first half-cycle. They provide  
ex cel lent protection of motor branch circuits  
con tain ing IEC or NEMA rated motor con trol lers  
or contactors.

Specifications

Voltage Ratings: 

 

AC: 

600 V 

 

DC: 

300 V

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

DC: 

20 kA

Ampere Range:

 

1

/

10

 – 30 A

Approvals:

 

AC: 

Standard 248-4, Class CC 

 

 

UL Listed 

1

/

10

-30 A  

 

 

(File No. E81895)

 

 

CSA Certified 

1

/

10

-30 A 

 

 

(File No. LR29862) 

 

DC: 

Littelfuse self-certified

Description

KLKR Series Class CC fuses are fast-acting 
fuses intended for general purpose branch circuit 
protection. Their compact size, fast-acting  
overload response, and highly current-limiting 
design make them ideal for use in OEM 
equipment and control panels.

Specifications

Voltage Ratings: 

 

AC: 

600 V 

 

DC: 

300 V

Interrupting Ratings:

  AC: 

200 kA rms symmetrical 

 

DC: 

20 kA

Ampere Range:

 

1

/

10

 – 30 A

Approvals:

 

AC: 

Standard 248-4, Class CC 

 

 

UL Listed 

1

/

10

-30 A  

 

 

(File No. E81895) 

 

 

CSA Certified 

1

/

10

-30 A 

 

 

(File No. LR29862) 

 

DC: 

Littelfuse self-certified

amPErE ratingS

1

/

10

6

/

10

1 

8

/

10

4 

1

/

2

10

1

/

8

3

/

4

2

5

12

15

/

100

8

/

10

2 

1

/

4

5 

6

/

10

15

3

/

16

1

2 

1

/

2

6

17 

1

/

2

2

/

10

1 

1

/

8

2 

8

/

10

6 

1

/

4

20

1

/

4

1 

1

/

4

3

7

25

3

/

10

1 

4

/

10

3 

2

/

10

7 

1

/

2

30

4

/

10

1 

1

/

2

3 

1

/

2

8

—

1

/

2

1 

6

/

10

4

9

—

amPErE ratingS

1

/

10

1

/

2

2 

1

/

2

6

12

1

/

8

3

/

4

3

7

15

2

/

10

1

3 

1

/

2

8

20

1

/

4

1 

1

/

2

4

9

25

3

/

10

2

5

10

30

Ordering Information

SEriES

amPEragE

CataLog 

nUmbEr

SyStEm 

nUmbEr

KLDR

10

KLDR010

KLDR010.t

Ordering Information

SEriES

amPEragE

CataLog 

nUmbEr

SyStEm 

nUmbEr

KLKR

12

KLKR012

KLKR012.t

Recommended Fuseholders

LPSC Series ....................................................pg. 108 
L60030C Series ..............................................pg. 101

Dimensions

Please refer to the Class CC/CD dimensions ... pg. 35

Recommended Fuseholders

LPSC Series ....................................................pg. 108 
L60030C Series ..............................................pg. 101

Dimensions

Please refer to the Class CC/CD dimensions ... pg. 35

Web Resources

For additional information, visit:  

www.littelfuse.com/klkr

Web Resources

For additional information, visit:  

www.littelfuse.com/kldr

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

35

www.littelfuse.com 

© 2010 Littelfuse POWR-GARD

®

 Products Catalog

1

Class CC/CD F

uses

Fuses — UL Class CC/CD

Current-Limiting Effects of CCMR (600 V) fuses

1.880

  (47 8)

.850

(21 6)

    

1.50

(38 1)

.50

(12 7)

.41

(10 3)

.25

(6 4)

.125

(3 2)

35-60 A

0-30 A

Short CirCUit 

CUrrEnt*

aPParEnt rmS SymmEtriCaL CUrrEnt For VarioUS FUSE ratingS

2 a

4 a

6

1

⁄

4  

a

10 a

12 a

15 a

20 a

30 a

5,000

160

190

330

370

525

600

625

750

10,000

180

220

400

440

600

700

725

875

15,000

200

250

430

480

675

775

800

950

20,000

220

260

460

520

720

825

850

1,000

25,000

230

280

480

550

750

850

900

1,050

30,000

240

290

500

570

800

900

950

1,125

35,000

245

300

520

590

825

925

975

1,175

40,000

255

310

550

600

850

975

1,000

1,200

50,000

260

330

570

640

875

1,000

1,100

1,300

60,000

280

340

600

670

900

1,050

1,125

1,350

80,000

300

360

625

700

1,000

1,125

1,200

1,400

100,000

310

380

650

750

1,050

1,200

1,250

1,500

150,000

340

420

700

800

1,150

1,300

1,400

1,600

200,000

350

440

750

850

1,200

1,400

1,450

1,750

*Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

CLaSS CC/CD DimEnSionS anD CUrrEnt-Limiting EFFECtS

Dimensions in inches (mm)

PEAK LET

-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL  R. M. S.  AMPERES

10000

100000

200000

100

1000

100

1000

10000

100000

1000000

10 A

8 A

6 A

4 A

10000

100000

200000

100

1000

100

1000

10000

100000

1000000

30 A

25 A

20 A

15 A

12 A

PEAK LET

-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL  R. M. S.  AMPERES

Peak Let-Thru Curve KLDR

Peak Let-Thru Curve KLKR

KLDR

KLKR

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com