POWR-GARD

®

  

PRODUCTS CATALOG

© 2018 Littelfuse, Inc.

FORM PF101N

Rev: 1-C-020818

Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to changes without notice. 

Visit Littelfuse.com for the most up-to-date technical information. 

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.

Littelfuse products are certified to many standards around 

the world. To check certifications on specific product please 

refer to the product datasheet on Littelfuse.com. 

Littelfuse World Headquarters

8755 West Higgins Road, Suite 500

Chicago, IL 60631, USA

Technical Support:

 

Tel: +1-800-TEC-FUSE
E-mail: techline@littelfuse.com

Customer Service:

Tel: +1-800-227-0029
E-mail: PG_CSG@littelfuse.com

Fax: +1-847-787-5190

Littelfuse SymCom

222 Disk Drive
Rapid City, SD 57701, USA

Technical Support

:

Tel: +1-800-832-3873
E-mail: techline@littelfuse.com

Customer Service:

 

Tel: +1-800-227-0029
E-mail: PG_CSG@littelfuse.com

Fax: + 1-605-348-5685

Littelfuse Startco

3714 Kinnear Place
Saskatoon, SK S7P 0A6
Canada
Tel: +1-306-373-5505
Fax: +1-306-374-2245
E-mail: techline@littelfuse.com

PO
WR-GAR

D

®

 PRODUCTS CA

TAL
OG

SURGE SUPPRESSION PRODUCTS

AUTOMOTIVE & ELECTRONIC FUSES

UL GENERAL INDUSTRIAL FUSES

HIGH-SPEED FUSES

MEDIUM VOLTAGE FUSES

PRE-ENGINEERED PANELS & SWITCHES

SOLAR PRODUCTS

BLOCKS & HOLDERS

Kaunas

Amsterdam

Muzquiz

Bellingham

Matamoros

Boston

Essen

Saskatoon

Piedras Negras

Seoul

Tokyo

Tsukuba

Suzhou

Wuxi

Beijing

Shanghai

Kunshan

Taipei

Chu-pei

Dongguan

Shenzhen

Hong Kong

Lipa City

Singapore

São Paulo

Legnago

Bremen

Deventer

Lauf

Ozegna

Troy

Eagle Pass

Manaus

Lake Mills

Rapid City

Chicago

Champaign

Freemont

Local Resources for a 

GLOBAL

 Market

Visit Technical Resources at Littelfuse.com

  

Technical information is only a click away. The Littelfuse Technical 

Resources contains datasheets, product manuals, whitepapers, 

application guides, demos, on-line design tools, and more.

Protection Relays & Controls Catalog 

(PF130N)   

The comprehensive line of electronic and microprocessor-
based protection relays, timers, and flashers safeguard 
equipment and personnel to prevent expensive damage, 
downtime or injury due to electrical faults.

POWR-GARD

®

 Solar Catalog 

(PF140N)

POWR-GARD Solar Products are designed specifically 
for photovoltaic applications where issues such as heat, 
efficiency, longevity and global standards impact the choices  
in selecting circuit protection.

An Extension of Your Team

Technical Hotline (800-TEC-FUSE or 800-832-3873)

 

Littelfuse engineers are a phone call away to help identify potential issues and provide 
product recommendations to resolve problems. 

Application and Field Support

 

Our experienced product and application engineers work step-by-step with customers 
from design to installation to determine the best solution.

...plus 30% more fuse blocks!

NEW  POWR-SPEED

®

High-Speed Fuses

NEW 1500V Solar Fuses & Holders

LFPXV Series  

Touch-Safe Fuse Holders

SPNH Series  

Solar Fuse

LFNH Series 

Fuse Terminal 

Covers

LFNH Series

Fuse Holder

1

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

Fuses

Class L Fuses ..................................................................................... 8
Class RK1 Fuses ............................................................................... 13
Class RK5 Fuses .............................................................................. 16
Class K5 Fuses .................................................................................20
Class J Fuses ................................................................................... 21
Class T Fuses ................................................................................... 24
Class G Fuses ...................................................................................26
Class CC  / CD Fuses .........................................................................27
UL Supplemental / 10 x 38 Fuses .....................................................30

Electronic Fuses & Automotive Blade

Glass / Electronic  Fuses ...................................................................33
Blade / Automotive  Fuses ................................................................36

Medium Voltage  Fuses 

Medium Voltage Fuses Overview ...................................................39
R-Rated Medium Voltage Fuses .....................................................40
E-Rated Medium Voltage Fuses ..................................................... 42
Medium Voltage Live Parts .............................................................48

Telecommunication Products

Telecommunications Power Fuses ..................................................49

Special Purpose Fuses

Solar Products Overview ................................................................57
1500 Vdc Solar Rated Fuses ...........................................................58
1000 Vdc Solar Rated Fuses ........................................................... 61
Forklift / Stud  Mounted  Fuses .........................................................64
Plug Fuses ........................................................................................65
MEGA

®

 Bolt-Down Fuses ...............................................................65

In-Line Fuses & Holders ..................................................................66
Cable Limiters ..................................................................................67
Cylindrical Fuses ..............................................................................68
OEM Custom Products ....................................................................69
High-Speed Square Body Fuses ..................................................... 71
High-Speed Round-Body Fuses ...................................................... 76
Traditional High-Speed Fuses .........................................................82

Fuse Blocks & Holders

LF Series Fuse Blocks Overview .....................................................89
Class J Fuse Blocks ......................................................................... 91
Class H ,  K5 & R Fuse Blocks ...........................................................94
Class T Fuse Blocks ....................................................................... 100
Class G Fuse Blocks ....................................................................... 105
Class CC / CD & Midget Fuse Blocks ............................................. 107
LF Series Fuse Block Covers ..........................................................112
Solar Rated Fuse Blocks .................................................................113
Dead Front Fuse Holders ................................................................119
Miscellaneous Fuse Blocks & Holders ......................................... 120
High-Speed Semiconductor Fuse Blocks ...................................... 128
Distribution &  Splicer Blocks ........................................................ 131
In-Line Fuse Holders ...................................................................... 149

Pre-Engineered Solutions

LCP Fused Selective Coordination Panel ...................................... 157
LPS Series POWR-Switch (Shunt Trip Disconnect)...................... 159

Suppression Products

Industrial Varistor Products .......................................................... 163
Surge Suppression Fuses .............................................................. 165
BVSP Suppression Fuses............................................................... 166

Miscellaneous Accessories

Fuse Reducers ............................................................................... 168
Box Cover Units ............................................................................. 169
Fuse Replacement & Custom Kit (FRCK Series) ........................... 170
Fuse Display & Cabinet ................................................................. 171

Technical Application Guide

Fuseology Fundamentals ............................................................... 173
Selection Considerations .............................................................. 174
Time-current Curves & Peak Let-through Charts ......................... 179
Selective Coordination .................................................................. 181
UL / CSA Fuse Classes & Applications .......................................... 184
Terms & Definitions ....................................................................... 186
Motor Protection Tables................................................................ 193
Condensed Fuse Cross Reference ................................................ 196 
Alphanumeric Index of Catalog Numbers .................................... 197

Table of Contents

1

2

3

4

7

5

8

6

9

10

1

6

2

7

3

8

5

10

4

9

2

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

FUSE CLASS AND SELECTION CHART

UL CLASS

LITTELFUSE 

SERIES

OVERLOAD 

CHARACTERISTICS

AC RATINGS

DC RATINGS

RECOMMENDED 

FUSE BLOCKS AND 

FUSE HOLDERS

FUSE SERIES 

PAGE 

NUMBERS

VOLTAGE 

(VOLTS)

CURRENT 

(AMPERES)

INTERRUPTING 

(AMPERES)

VOLTAGE 

(VOLTS)

CURRENT 

(AMPERES)

INTERRUPTING 

(AMPERES)

L

KLPC

Time-Delay

600

200 - 6000

200K / 300K*

480

200 - 6000

20,000

–

8

KLLU

Time-Delay

600

601 - 4000

200,000

300

601 - 4000

20,000

9

LDC

Fast-Acting

600

150 - 2000

200,000

600

150 - 2000

50,000

10

RK1

LLNRK

Time-Delay

250

0.1 - 600

200K / 300K*

125

0.1 - 600

20,000

LFR25

13

LLSRK_ID

Time-Delay

600

0.1 - 600

300

0.1 - 600

LFR60

13

LLSRK

Time-Delay

600

0.1 - 600

300

0.1 - 600

LFR60

13

KLNR

Fast-Acting

250

1 - 600

200,000

125

1 - 600

LFR25

15

KLSR

Fast-Acting

600

1 - 600

250 

300

1 - 30 

35 - 600

LFR60

15

RK5

FLNR_ID

Time-Delay

250

35 - 600

200K / 300K*

125

35 - 600

20,000

LFR25

17

FLNR

250

0.1 - 600

125

0.1 - 600

17

FLSR_ID

600

0.1 - 600

300

0.1 - 600

LFR60

17

FLSR

600

0.1 - 600

300

0.1 - 600

17

IDSR

600

0.1 - 600

600

0.1 - 600

16

J

JTD_ID

Time-Delay

600

0.8 - 600

200K / 300K*

300 

500

0.8 - 100 

110 - 600

20,000

LFJ60 • LFPSJ

21

JTD

Time-Delay

600

0.8 - 600

21

JLS

Fast-Acting

600

1 - 600

200,000

–

–

–

22

T

JLLN

Fast-Acting

300

1 - 1200

200,000

160 

125

1 - 60 

70 - 1200

20,000

LFT30 • 

LSCR002 (700-800A)

24

JLLS

600

1 - 1200

300

1 - 1200

LFT60 •  

LSCR002 (700-800A)

24

CC

CCMR

Time-Delay

600

0.2 - 30

200K / 300K*

250 

250 

300 

500

0.2 - 2 

4.5 - 10 

2.25 - 4 

12 - 30

20,000

L60030C • LFPSC • 

LPSC • 571 • 572 • 

LEC • LEY

27

KLDR

Time-Delay

600

0.1 - 30

200,000

300

0.1 - 30

28

KLKR

Fast-Acting

600

0.1 - 30

200,000

300

0.1 - 30

28

CD

CCMR

Time-Delay

600

35 - 60

200K / 300K*

250

35 - 60

20,000

LFC60060

27

G

SLC

Time Lag

600 

480

0.5 - 20 

25 - 60

100,000

170

0.5 - 60

10,000

LFG600 (1/2 - 20A)

26

LFG480 (25 - 60A)

Solar

SPF

Solar

–

–

–

1000

1 - 30

20,000

LFPHV

62

SPFJ

600

125-450

200,000

1000

70 - 450

 20K (70 - 200A)

10K (250 - 400A)

20K (450A)

LFJ1000

63

SPFI

–

–

–

1000

2 - 30

20,000

Not Required

61

SPNH

–

–

–

1500

50 - 400

15,000

LFNH

60

SPXV

–

–

–

1500

6 - 30

30,000

LPXV

58

SPXI

–

–

–

1500

2.5 - 30

30,000

Not Required

59

K5

NLN

Fast-Acting

250

1 - 600

50,000

250

1 - 600

20K (1 - 60A) 

50K (70 - 600A)

LFH25

20

NLS

600

1 - 600

600 

500 

400 

600 

500

1 - 7 

8 - 30 

35 - 60 

70 - 200 

225 - 600

20K (1 - 60A) 

50K (70 - 600A)

LFH60

20

High-Speed

L15S

Very Fast-Acting

150

1 - 1000

200,000

150 

100

1 - 60 

70 - 1000

20,000

LSCR • 1LFS

81

L25S

250

1 - 800

250 

200

1 - 200 

225 - 800

81

L50QS

500

35-800

500

35-800

50,000

LSCR

71

L50S

10 - 800

450

10 - 800

20,000

LSCR • 1LFS

77

L60S

600

1 - 800

–

–

81

L70QS

700

35-800

700

35-800

50,000

LSCR

74

L70S

10 - 800

650

10 - 800

20,000

LSCR • 1LFS

79

Midget 

(Supplementary)

BLF

Fast-Acting

250 

125

0.5 - 15 

20 - 30

10,000

–

–

–

L60030M • LFPSM •  

571 • 572 • 

LEB • LEX

30

BLN

Fast-Acting

250

1 - 30

10,000

–

–

–

30

BLS

Fast-Acting

600 

250

0.2 - 5 

6 - 10

10,000

–

–

–

31

FLA

Time-Delay

125

0.1 - 30

10,000

–

–

–

31

FLM

Time-Delay

250

0.1 - 30

10,000

125

0.1 - 30

10,000

30

FLQ

Time-Delay

500

0.1 - 30

10,000

300

0.1 - 30

10,000

30

KLK

Fast-Acting

600

0.1 - 30

100K / 200K*

500

0.1 - 30

50,000

30

KLKD

Fast-Acting

600

0.1 - 30

100,000

600

0.1 - 30

50,000

30

KLQ

Time-Delay

600

1 - 6

10,000

–

–

–

31

FLU

Fast-Acting

1000

0.44/ 

11

10,000 

20,000

1000

0.44 

11

10,000 

20,000

LFPHV

31

Plug

SOO, TOO

Time-Delay

125

0.25 - 30

10,000

–

–

–

Box Cover Units

65

SLO, TLO

Medium Time-Delay

125

15 - 30

10,000

–

–

–

Telecom

L17T

Fast-Acting

–

–

–

170

70 - 1200

100,000

LTFD Series

50

TLN

–

–

–

1 - 600

LFR25

51

TLS

–

–

–

1 - 125

LTFD101 • 

LFT30060 (cartridge)

52

* Littelfuse

®

  self-certified

3

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© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL FUSE CLASS

POWR-PRO

®

PAGE NUMBERS 

Class L

KLPC & LDC

8, 10

Class RK1

LLNRK/LLSRK/LLSRK_ID

13

Class J

JTD/JTD_ID

21

Class CC / CD

CCMR 

(

2

/

10

–60)

27

TM

Increase safety and reduce inventory  

with MROplus

Your detailed reports will include:
•  A streamlined current-limiting fuse inventory 

recommendation

•  A guide to reducing electrical hazards within your facility
•  An annual cost savings estimate

•  A detailed cross reference

Contact your local sales representative for the MROplus  
request form.

Look for the POWR-PRO

®

 logo (or green  

fuse label) for superior protection

Littelfuse POWR-GARD

®

–  

Advanced Protection and 
Facility Savings

Increase safety with POWR-PRO

®

 Fuses

•  Superior current-limitation from 

1

/

10

 – 6000 amperes

•  Type 2 “No Damage” coordination with NEMA  

and IEC motor circuits

•  Blown fuse indication (LLSRK_ID and JTD_ID Series)
•   Compact motor protection (JTD/JTD_ID, CCMR Series)
•  300,000 AIR to meet trends toward higher SCCR

4

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

SPXV Series Space-Saving Solar Fuse ...................58

SPXI Series In-Line Solar Fuse ................................59

SPNH Series 1500 Vdc Solar Fuse ..........................60

LPXV Series 1500 Vdc Fuse Holder .......................112

LFPXV Series 1500 Vdc Fuse Holder .................... 113

New Products............................... littelfuse.com/solar

SPFI Series 1000 Vdc In-Line Solar Fuse .................. 61

SPF Series 1000 Vdc 10x38mm Fuse....................... 62

SPFJ Series 1000 Vdc Class J Size Fuse ..................63

LPHV 1000 Vdc Fuse Holder ................................... 116

IDSR Series 600 Vdc Class RK5 Fuse ....................... 16

KLKD Series 600 Vdc 10x38mm Fuse ......................30

1500 Vdc Solar Products

600-1000 Vdc Solar Products

Look for this logo to indicate products that are used in solar applications.  
Visit our website littelfuse.com/solar for the latest updates on  
approvals, certifications, and new products.

POWR-GARD

®

 SOLAR RATED PRODUCTS

This catalog incorporates our line of products designed specifically for the growing solar industry. As global 
standards are constantly changing, Littelfuse continues to develop circuit protection products that meet the 
requirements of the evolving photovoltaic market.

Developing Next Generation 
1500 Vdc Products for High  
And Low Current Ratings

5

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© 2018 Littelfuse POWR-GARD

®

 Products Catalog

Enhanced 
Overload Relays

Protect motors and 

pumps from over/

under current, over/

under voltage, phase 

issues and ground 

faults. Communication 

modules also available.

Voltage/Phase 
Monitors

A cost-effective means 

to protect motors and 

pumps from voltage 

and phase issues.

Alternating 
Relays

Start and stop up to 

four pumps or use as 

a multi-channel switch. 

Intrinsically safe 

options available.

Pump  
Controllers

Balance runtime 

between loads and can 

be used in hazardous 

locations.

 
Load Sensors

Detect if the load is 

running or if there is an 

overload or underload 

condition.

Timers & 
Flashers

Delay starting 

and stopping 

loads, cycling, and 

sequencing of motors, 

pumps, compressors, 

heaters, and lighting.

PROTECTION RELAYS & CONTROLS

Expanding our Line of Protection Relay Products

SymCom and SSAC the names you know and trust for Motor Protection, Pump Protection, and 
Timers have officially become part of the Littelfuse family. Over 1000 MotorSaver, PumpSaver, 
and SSAC parts have been added to Littelfuse.com. These robust products are used to control 
and protect applications in the Industrial Pumping, Irrigation, Water and Waste Water, HVAC/R, 
Oil and Gas, Food and Beverage, and Elevator markets. 

Find all of our new and updated product pages at 

littelfuse.com/protection-relays

. 

FINDING 

RELAYS IS 

EASIER THAN 

EVER!

New protection relay products include:

To view the full line of protection relay products please visit www.littelfuse.com/protection-relays

6

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

LCP Series Coordination Panel

Ideal for circuits that require selective coordination  

such as emergency lighting circuits or essential  

electrical systems.

Features/Benefits

•  Meets NEC

®

 requirements

•  Class CC & J fuse holders have open-circuit indication
•  Fast-acting fuses protect against short circuits 
•  Feed through/sub feed lugs and 84-circuit  

configuration available

•  Ground and neutral bars
•  Copper bus standard

littelfuse.com/LCP
See page 157

LPS Series POWR-Switch

Individual fusible shunt trip disconnect switch easily 

coordinates with system’s overcurrent protection.  

Typical applications include elevator circuits.

Features/Benefits

•  Pre-engineered single unit makes procurement easy
•  Reduces labor costs up to 66%
•  Flexibility for a variety of applications
•  Control power terminal block
•  UL Listed package
•  Cu and AI wire rated
•   Lockable operating handle meets all code and  

safety requirements

littelfuse.com/LPS
See page 159

Meet NEC

®

 Requirments  

And Save Time With  

Pre

-

Engineered Solutions

7

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© 2018 Littelfuse POWR-GARD

®

 Products Catalog

FUSES

UL Class L Fuses ........................................................ 8

UL Class RK1 Fuses .................................................... 13

UL Class RK5 Fuses.................................................... 16

UL Class K5 Fuses .....................................................20

UL Class J Fuses ....................................................... 21

UL Class T Fuses .......................................................24

UL Class G Fuses ......................................................26

UL Class CC/CD Fuses ................................................27

UL Supplemental Midget (10x38) Fuses ............................. 30

Table of Contents

Section Overview

Since 1927 Littelfuse

®

 has been providing fuses to the industrial 

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.

8

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class L F

uses

Fuses – UL Class L

CLASS L - KLPC SERIES POWR-PRO

®

 FUSES

 

 

     600 Vac • Time-Delay • 200-6000 A

Web Resources

Download TC Curves, CAD drawings and other technical 
information: 

littelfuse.com/klpc

Dimensions

Please refer to the Class L dimensions ............................. 12

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 11

Ordering Information

KLPC

Description

KLPC series POWR-PRO

®

 fuses meet or exceed the most 

stringent project specifications, including 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

•  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 Vac or less 

 

DC: 480 V

Ampere Range

 

200 – 6000 A

Interrupting Ratings 

 

AC:  200 kA rms symmetrical 

300 kA rms symmetrical 
(Littelfuse self-certified)

 

DC: 20,000 A

Approvals

 

AC:  Standard 248-10, Class L 

UL Listed 601–6000 A (File: E81895) 
UL Recognized 200–600 A (File: E71611) 
CSA Certified 601–6000 A (File: LR29862) 
Federal Specifications 700–6000 A 
(QPL-W-F-1814)

 

DC: Littelfuse self-certified 

Material 

Melamine body, Copper caps (silver plated)

Country of Origin  

Mexico

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

SERIES

AMPERAGE

CATALOG NUMBER ORDERING NUMBER

KLPC

800

KLPC800

KLPC800.X

1

9

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© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class L F

uses

Fuses – UL Class L

CLASS L - KLLU SERIES FUSES

600 Vac • Time-Delay • 601-4000 A

Web Resources

Download TC Curves, CAD drawings and other technical 
information: 

littelfuse.com/kllu

Dimensions

Please refer to the Class L dimensions ............................. 12

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 11

Ordering Information

KLLU

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 Vac or less 

 

DC: 300 V

Ampere Range

 

601–4000 A

Interrupting Ratings

 

AC: 200 kA rms symmetrical 

 

DC: 20 kA rms symmetrical

Approvals

 

Standard 248-10, Class L 

 

UL Listed (File: E81895) 

 

CSA Certified (File: LR29862) 

 

DC: Littelfuse self-certified

Material 

Melamine body, Copper caps (silver plated)

Country of Origin  

Mexico

AMPERE RATINGS  

601

750

1000

1400

1800

3000

650

800

1200

1500

2000

3500

700

900

1350

1600

2500

4000

SERIES

AMPERAGE

CATALOG NUMBER ORDERING NUMBER

KLLU

601

KLLU601

KLLU601.X

1

10

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class L F

uses

CLASS L - LDC SERIES POWR-PRO

®

 FUSES

 

 

     600 Vac/dc • Fast Acting • 150-2000 A

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

•  Extremely Current-Limiting
•  600 Vac/dc rated
•  200 kA AC Interrupting Rating
•  50 kA DC Interrupting Rating

Specifications

Voltage Ratings 

 

600 Vac/dc or less

Ampere Range

 

150–2000 A

Interrupting Ratings

 

AC: 200 kA rms symmetrical 

 

DC:  50 kA

Time Constant

 

16 ms

Approvals

 

Standard 248-10, Class L 

 

UL Listed 601–2000 A (File: E81895) 

 

UL Recognized 150–600 A (File: E71611) 

 

CSA Certified 800-2000 A (File: LR29862)

Material 

Melamine body, Copper caps (silver plated)

Country of Origin  

Mexico

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

Download TC curves, CAD drawings and other technical 
documents: 

littelfuse.com/ldc

Dimensions

Please refer to the Class L dimensions ............................. 12

Peak Let-Thru Curve

Note: For more information, see Peak Let-Thru Table on pg. 11

SERIES

AMPERAGE

CATALOG NUMBER ORDERING NUMBER

LDC

700

LDC700

0LDC700.X

Ordering Information

LDC

Fuses – UL Class L

1

11

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class L F

uses

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  

Fuses – UL Class L

1

12

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class L F

uses

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 INCHES (mm)

A

B

C

D

E

F

G

H

J

K

L

M

N

150-800

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

Fuses – UL Class L

1

13

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class RK1 F

uses

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

Fuses – UL Class RK1

CLASS RK1 – LLNRK • LLSRK • LLSRK_ID SERIES FUSES

 

 

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

1

/

10

-600 A

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
•  Indication available
•  Dual-element design
•  Extremely Current-Limiting
•  IEC Type 2 “No Damage” protection to IEC and NEMA 

type motor starters

•  Indicating and DIN mount fuse holders 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: E81895) 

CSA Certified (File: 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 available for the 600 V.

Recommended Fuse Holders

LFR60 Series • LFR25 Series ............................................ 94

1,000

10,000

100,000

PEAK 

LET-

TH

R

U

 IN

 AM

PER

ES

600A -

400A -

200A -

100A -

60A -

30A -

12A -

5A -

3.5A -

10

100

10

100

1,000

10,000

100,000

AVAILABLE FAULT CURRENT

SYMMETRICAL  R.M.S.  AMPERES

BASIS FOR DATA:

TEST VOLTAGE:  600V

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       
03/14/2016
A

2 OF 6

FCC05-LSRK      

LLSRK & LLSRKID 3.5A - 600A

- DATA GENERATED IN EXCEL -

Peak Let-Thru Curve (600 V)

Ordering Information

TYPE

SERIES

AMP

CATALOG 

NUMBER

ORDERING 

NUMBER

INDICATING

LLSRK_ID

60

LLSRK060ID

LSRK060.TXID

NON-INDICATING

LLSRK

60

LLSRK060

LSRK060.T

600 V

250 V

TYPE

SERIES

AMP

CATALOG 

NUMBER

ORDERING 

NUMBER

NON-INDICATING

LLNRK

80

LLNRK080

LNRK080.V

LLSRK & LLSRKID

QPL

Web Resources

Download TC Curves, CAD drawings and other technical 
information:  

littelfuse.com/llsrk 
littelfuse.com/llnrk

Dimensions

Please refer to the Class R dimensions ............................. 19

1

14

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class RK1 F

uses

Fuses – UL Class RK1

CLASS RK1 – LLNRK • LLSRK • LLSRK_ID SERIES FUSES

SHORT CIRCUIT 

CURRENT*

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS

3.5 A

5 A

12 A

30 A

100 A

200 A

400 A

600 A

 5,000 

196

251

427

586

1,764

2,821

-

-

 10,000 

247

316

538

739

2,222

3,554

6,850

8,489

 15,000 

283

362

616

845

2,544

4,069

7,842

9,718

 20,000 

312

399

677

930

2,800

4,478

8,631

10,696

 25,000 

336

430

730

1,002

3,016

4,824

9,297

11,522

 30,000 

357

456

776

1,065

3,205

5,126

9,880

12,244

 35,000 

376

481

816

1,121

3,374

5,397

10,401

12,889

 40,000 

393

502

854

1,172

3,528

5,642

10,874

13,476

 50,000 

423

541

919

1,263

3,800

6,078

11,714

14,516

 60,000 

450

575

977

1,342

4,038

6,459

12,448

15,426

 80,000 

495

633

1,075

1,477

4,445

7,109

13,700

16,979

 100,000 

533

682

1,158

1,591

4,788

7,658

14,758

18,290

 150,000 

610

781

1,326

1,821

5,481

8,766

16,894

20,936

 200,000 

671

859

1,460

2,005

6,032

9,648

18,594

23,043

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 

 

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  
downtime caused by power surges  
or equipment demands.

1

15

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class RK1 F

uses

CLASS RK1 – KLNR / KLSR SERIES FUSES

250/600 Vac • Fast-Acting • 1-600 A

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

Download TC Curves, CAD drawings and other technical 
information: 

 littelfuse.com/klsr 
littelfuse.com/klnr

Recommended Fuse Blocks

LFR Series ......................................................................... 94

Dimensions

Please refer to the Class R dimensions ............................. 19

05549002

Peak Let-Thru Curve (600 V)

Ordering Information

VOLTAGE

SERIES

AMP

CATALOG 

 NUMBER

ORDERING 

NUMBER

600

KLSR

90

KLSR090

KLSR090.V

250

KLNR

90

KLNR090

KLNR090.V

KLSR

Fuses – UL Class RK1

Description

KLSR and KLNR series are en economical design providing 

the safety of a RK1 fuse. The single element design  

provides fast-acting overload and short-circuit protection.
Use POWR-PRO

®

 LLNRK and LLSRK series RK1, dual-

element, time-delay fuses in all new applications requiring  

the current-limiting ability of UL Class RK1 fuses or in  

existing applications where fast-acting RK1 or RK5 fuses  

have been opening on harmless system surges such as  

motor starting currents.

Applications

•  Resistance heaters

•  Lighting circuits

•  Non-inductive loads

Features/Benefits

•  Extremely Current-Limiting

•  Indicating and DIN mount fuse blocks available

Specifications

Voltage Ratings 

 

AC:  600 Vac or less (KLSR) 

250 Vac or less (KLNR)

 

DC:  250 V (1 – 30 A KLSR); 

300 V (35 – 600 A KLSR) 

125 V (KLNR)

Ampere Range

 

1 – 600 A

Interrupting Ratings

 

AC: 200 kA rms symmetrical 

 

DC: 20 kA

Approvals

 

AC:  Standard 248-12, Class RK1 

UL Listed (File: E81895) 

CSA Certified (File: LR29862)

 

DC: Littelfuse self-certified

Material 

1-60 A: Composite body, Bronze cap (nickel plated) 

 

70-100 A: Composite body, Copper caps 

 

110-600 A: Melamine body, Copper caps

Country of Origin  

Mexico

1

16

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class RK5 F

uses

Fuses – UL Class RK5

CLASS RK5 – IDSR SERIES INDICATOR

®

 POWR-PRO

® 

FUSES

 

 

     600 Vac/dc • Dual Element • Time-Delay • 

1

/

10

-600 A

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.

Web Resources

Download TC Curves, CAD drawings and other technical 
information: 

littelfuse.com/idsr

Recommended Fuse Blocks

LFR Series ......................................................................... 94

Dimensions

Please refer to the Class R dimensions ............................. 19

VOLTAGE

SERIES

AMP

CATALOG  

NUMBER

ORDERING  

NUMBER

600

IDSR

30

IDSR030

IDSR030.T

Description

The IDSR combines 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

•  Current limiting

•  Indication

Specifications

Voltage Ratings 

 

 AC: 600 Vac or less 
DC: 600 Vdc or less

Ampere Range

 

1

/

10

 – 600 A

Interrupting Ratings

 

AC:  200 kA rms symmetrical 

300 kA rms symmetrical 
(Littelfuse self-certified)

 

DC: 20 kA

Approvals

 

 Standard 248-12, Class RK5 
UL Listed (File: E81895) 
CSA Certified (File: LR29862)

Material 

1/10-60 A: Composite body, Bronze caps 

 

70-600 A: Composite body, Copper caps

Country of Origin  

Mexico

Peak Let-Thru Curve

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

100

1000

10000

100000

1000000

100

1000

10000

100000

2000000

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

PEAK LET-THRU IN AMPER

ES

15 A

30 A

60 A

100 A

200 A

400 A

600 A

IDSR

1

17

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class RK5 F

uses

Fuses – UL Class RK5

CLASS RK5 – FLNR_ID • FLSR_ID SERIES INDICATOR

®

 FUSES

250/600 Vac • Dual Element • Time Delay • 

1

/

10

-600 A

Description

Available in both Indicating and Non-Indicating versions, 
the FLNR/FLSR series of fuses set 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
•  Transformers
•  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: E81895) 

   

CSA Certified (File: LR29862) 

   

Federal Specification WF-1814 

   

(QPL- W-F-1814)

Web Resources

Download TC Curves, CAD drawings and other technical 
information:  

littelfuse.com/flsr 
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 Fuse Holders

LFR60 Series • LFR25 Series ............................................ 94

Dimensions

Please refer to the Class R dimensions page 19.

Peak Let-Thru Curve (600 V)

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

Ordering Information

TYPE

VOLT

SERIES AMP CATALOG 

NUMBER

ORDERING 

NUMBER

NON-INDICATING

600

FLSR

15

FLSR015

FLSR015.T

INDICATING

600

FLSR_ID

15

FLSR015ID

FLSR015.TXID

NON-INDICATING

250

FLNR

60

FLNR060

FLNR060.T

INDICATING

250

FLNR_ID

60

FLNR060ID FLNR060.TXID

QPL

FLSR_ID

1

18

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL 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

1

19

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

Fuses – UL Class R

UL Class R F

uses

CLASS R SERIES DIMENSIONS

AMPS

FIGURE

NUMBER

SERIES

DIMENSIONS INCHES (mm)

A

B

C

D

E

F

G

H

J

K

1

/

10

–30

1

LLNRK 

KLNR

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

KLSR

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

KLNR

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

KLSR

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

KLNR

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

KLSR

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

KLNR

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

KLSR

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

KLNR

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

KLSR

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

KLNR

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

KLSR

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

1

20

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class K5 F

uses

Fuses – UL Class K5

CLASS K5 - NLN / NLS SERIES (ONE-TIME) FUSES

250/600 Vac • “One-Time” • 1-600 A

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.

Recommended Fuse Blocks

LFH Series ......................................................................... 94

VOLTAGE SERIES

AMP

CATALOG NUMBER ORDERING NUMBER

600

NLS

20

NLS020

0NLS020.T

250

NLN

15

NLN015

0NLN015.T

Description

NLN and NLS fuses provide low cost protection for general  

purpose feeder and branch circuits when available short  

circuit currents are less than 50 kA.

Note: Canadian Electrical Code NLKP Type P fuse available. Visit littelfuse.com/nlkp

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

Web Resources

Download TC Curves, CAD drawings and other technical 

information:  

littelfuse.com/nln 

littelfuse.com/nls

Dimensions

Specifications

Voltage Ratings 

 

AC:  600 Vac or less (NLS)  

250 Vac or less (NLN)

 

DC:  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) 

250 V (NLN)

Ampere Range

 

1 – 600 A

Interrupting Ratings

 

AC: 50 kA rms symmetrical 

 

DC:  20 kA (1 – 60 A) 

50 kA (70 – 600 A)

Approvals

 

Standard 248-9, Class K5 

 

UL Listed (File: E81895) 

 

CSA Certified (File: LR29862)

Material 

NLS:  1-15 A: Fiber body, Bronze cap 

20-60 A: Composite body, Bronze cap 

70-600 A: Fiber body, Copper cap (tin plated)

 

NLN:  1-30 A: Ceramic body 

35-60 A: Fiber body, Bronze cap 

70-600 A: Fiber body, Copper cap (tin plated)

Country of Origin  

Mexico

Ordering Information

A

C

C

D

A

E

B

B

F D

G

FIG. 1

FIG. 2

AMPERES

REFER TO

FIG. NO.

SERIES

DIMENSIONS INCHES (mm)

A

B

C

D

E

F

G

1 – 30

1

NLN

2  (50.8)

1

⁄

2

  (12.7)

1

⁄

2

  (12.7)

9

⁄

16

  (14.3)

—

—

—

NLS

5  (127.0)

3

⁄

4

  (19.1)

5

⁄

8

  (15.9)

13

⁄

16

  (20.6)

—

—

—

35 – 60

1

NLN

3  (76.2)

3

⁄

4

  (19.1)

5

⁄

8

  (15.9)

13

⁄

16

  (20.6)

—

—

—

NLS

5

1

⁄

2

  (139.7)

1  (25.4)

5

⁄

8

  (15.9)

1

1

⁄

16

  (27.0)

—

—

— 

70 – 100

2

NLN

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

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

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

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

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

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

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

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) 

1

21

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

Fuses – UL Class J

Web Resources

Download TC Curves, CAD drawings and other technical 
information: 

littelfuse.com/jtd

Recommended Fuse Holders

LFJ60 Series ...................................................................... 91 
LFPSJ Series (

8

⁄

10 

–60 A)

 .......................................................118

Dimensions

Please refer to the Class J dimensions ............................. 23

UL Class J F

uses

CLASS J - JTD SERIES INDICATOR

®

 POWR-PRO

®

 FUSES

 

               600 Vac  •  Time Delay  • 

8

/

10

-600 A

AMPERAGE 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.

Features/Benefits

•  POWR-PRO

®

 Performance 

•  Current-Limiting
•  IEC Type 2 Protection
•  Indication and non-indication version available
•  Indicating and DIN mount holders available

Applications

•  Fused combination motor controllers and motor  

control centers

•  Transformer protection
•  Protection for series rated molded case  

circuit-breaker panels

•  General purpose circuits

Specifications

Voltage Ratings  

AC

: 

600 V

 

 

DC:  300 V (

8

⁄

10 

–100 A) 

500 V (110–600 A)

Amperage Range

 

8

⁄

10

–600 A

Interrupting Rating

 

AC:   200

 

kA rms symmetrical 

300kA rms symmetrical  

(Littelfuse self-certified)

 

DC:   20

 

kA

Material 

Body: Melamine 

 

Caps:  Nickel-plated Bronze (

8

⁄

10

–60 A) 

Brass (70–200 A)

 

Brass Cap with Copper Blade (225–600 A)

Approvals  

AC:  Standard 248-8, Class J 

UL Listed (File: E81895) 
CSA Certified (File: LR29862)

 

DC: Littelfuse self-certified

Country of Origin  

Mexico

TYPE

SERIES AMPERAGE CATALOG 

NUMBER

ORDERING 

NUMBER

INDICATING

JTD_ID

60

JTD60ID

0JTD060.TXID

NON-INDICATING

JTD

60

JTD60

0JTD060.T

100,000 

90,000 
80,000 
70,000 
60,000 

50,000 

40,000 

30,000 

20,000 

10,000 

9,000 
8,000 
7,000 
6,000 

5,000 

4,000 

3,000 

2,000 

100,000 
90,000 
80,000 
70,000 
60,000 

50,000 

40,000 

30,000 

20,000 

10,000 
9,000 
8,000 
7,000 
6,000 

5,000 

4,000 

3,000 

2,000 

200,000 

100,000 

90

,0

00

 

80

,0

00

 

70

,0

00

 

60

,0

00

 

50

,0

00

 

40

,0

00

 

30

,0

00

 

20

,0

00

 

10

,0

00

 

9,000 

8,000 

7,000 

6,000 

5,000 

4,000 

3,000 

2,000 

1,000 

900 

800 

700 

600 

500 

400 

300 

200 

100 

PEAK 

LET-

TH

RU

 IN

 AM

PER

ES

600A -

400A -

200A -

100A -

60A -

30A -

1,000 

900 
800 
700 
600 

500 

400 

300 

200 

100 

1,000 
900 
800 
700 
600 

500 

400 

300 

200 

100 

20

0,

00

0 

10

0,

00

0 

90

,0

00

 

80

,0

00

 

70

,0

00

 

60

,0

00

 

50

,0

00

 

40

,0

00

 

30

,0

00

 

20

,0

00

 

10

,0

00

 

9,

00

0 

8,

00

0 

7,

00

0 

6,

00

0 

5,

00

0 

4,

00

0 

3,

00

0 

2,

00

0 

1,

00

0 

900 

800 

700 

600 

500 

400 

300 

200 

100 

AVAILABLE FAULT CURRENT

SYMMETRICAL  R.M.S.  AMPERES

BASIS FOR DATA:

TEST VOLTAGE:

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       
03/15/2016
A

2 OF 2

FCC05-JTD

JTD & JTDID 30A - 600A

- DATA GENERATED IN EXCEL -

Peak Let-Thru Curve

Ordering Information

Note: For more information, see Peak Let-Thru Table on page 23.

1

22

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class J F

uses

Fuses – UL Class J

Dimensions

Please refer to the Class J dimensions ............................. 23

CLASS J – JLS SERIES FUSES

600 VAC • Fast-Acting  • 1-600 A

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

The UL Listed Class J JLS Series fuses provide space 

saving, fast-acting overload and short-circuit protection for 

vital industrial and power conversion applications.
Littelfuse’s  JLS Series fuses offer best in class current 

limitation that prevents equipment damage from overcurrent 

faults.

Features and Benefits

• 

Superior performance in a space saving package

• 

Reliable interruption of all overcurrents with protection 

up to 200kA

• 

Extremely current limiting

• 

Fast-acting protection for surge-sensitive devices and 

components

• 

Reduces heating and magnetic effects due to 

overcurrents, extending equipment life

• 

Economical and readily available

Applications

• 

Power conversion device protection

• 

Variable speed drives

• 

Rectifiers

• 

Resistive loads

• 

Solid-state devices

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

05567005

TYPE

SERIES AMPERAGE

CATALOG 

NUMBER

ORDERING 

NUMBER

NON-INDICATING

JLS

110

JLS110

0JLS110.X

Ordering Information

Web Resources

Download TC curves, CAD drawings and other technical 
information: 

littelfuse.com/jls

Recommended Fuse Holders

LFJ60 Series ...................................................................... 91 
LFPSJ Series (

8

⁄

10 

–60 A)

 .......................................................118

QPL

JLS

Peak Let-Thru Curve

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: E81895) 

 

CSA Certified (File: LR29862) 

 

Federal Specification WF-1814 

 (QPL-W-F-1814)

1

23

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

Fuses – UL Class J

UL Class J F

uses

CLASS J DIMENSIONS AND CURRENT-LIMITING EFFECTS

A

C

D

G

F

E

H

A

B

C

D

Fig. 1

Fig. 2

Dimensions 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

FIGURE 

NUMBER

DIMENSIONS 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 of JTD_ID, JTD and JLS

1

24

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class 

T F

uses

Fuses – UL Class T

CLASS T - JLLN / JLLS SERIES FUSES   

300/600 Vac • Fast-Acting • 1-1200 A

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.

Features/Benefits

•  Extremely current-limiting
•  Compact design
•  200 kA Interrupting Rating
•  JLLN 35-60 A available with PCB mounts (see datasheet)

Applications

•  Variable speed drive protection 
•  Compact mains switches

Specifications

Voltage Ratings 

 

 AC:  300 V  (JLLN) 

600 V (JLLS)

 

DC:  125 V  (JLLN 70 – 1200 A) 

 

       160 V  (JLLN 1 – 60 A) 

 

       300 V  (JLLS)

Interrupting Ratings

 

AC: 200 kA rms symmetrical

 

DC: 20 kA (JLLN 35-1200 A only)

Ampere Range

 

1 – 1200 A

Approvals

 

AC:  Standard 248-15, Class T 

UL Listed (File: E81895): 

JLLN (1 – 1200 A) 

JLLS (1 – 1200 A) 

CSA Certified (File: LR29862) 

JLLN/JLLS (1 – 600 A)

 

DC:  UL Listed (File: E81895): 

JLLN (35 – 1200 A) 

Littelfuse self-certified 

JLLN (1 – 30 A) 

JLLS (1 – 1200 A)

Material 

JLLN:  1-30 A: Melamine body, Bronze caps 

35-1200 A: Melamine body, Copper caps

 

JLLS:  1-30 A: Melamine body, Copper caps 

35-60 A: Melamine body, Bronze caps 

70-1200 A: Melamine body, Copper caps

Environmental

 

 RoHS  Compliant

  

*JLLS only

Web Resources

Download TC Curves, CAD drawings and other technical 
information:  

littelfuse.com/jlln 
littelfuse.com/jlls

Recommended Fuse Holders

LFT30 Series .................................................................... 100 
LFT60 Series .................................................................... 100 
LSCR Series for 70-800 A ................................................ 127

Dimensions

Please refer to the Class T dimensions .............................. 25 
Please refer to the JLLN datasheet for PCB mount 
dimensions: 

littelfuse.com/jlln

Ordering Information

AMPERE RATINGS

1

25

70

175

450

1100

2

30

80

200

500

1200

3

35

90

225

600

6

40

100

250

700

10

45

110

300

800

15

50

125

350

  900*

20

60

150

400

1000

Part Numbering System

SERIES AMP PACK

SIZE

PLATING

SUFFIX

MOUNT 

SUFFIX

CATALOG 

NUMBER

ORDERING 

NUMBER

JLLS

6

T

–

–

JLLS006

JLLS006.T

JLLN

35

V

–

XL

†

JLLN035L

JLLN035.VXL

JLLN

100

V

XP

–

JLLN100P

JLLN100.VXP

† 

Option is available for JLLN 35-60 A only. Premium plating is standard

JLLN  xxxx  V  —

Package Quantity

Series

Options

Amperage

T = 10 (1-60 A) 

V = 5 (70-100 A) 

X = 1 (110-1200 A)

Blank = Standard Non-Plated
XP = Premium Plated 

XL = Leaded

†

 

XV = Vertical Mount

†

 

XLS = Solder Lead

†

 

1

25

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

Fuses – UL Class T

UL Class 

T F
uses

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

1,810

2,500

4,600

5,000

5,000

5,000

 10,000 

945

1,525 2,300

3,150

6,000

8,500

9,400 10,000

 15,000 

1,050 1,700

2,610

3,600

6,600

9,750 10,500 13,000

 20,000 

1,150 1,900 2,900

3,950

7,250 10,500 11,000 14,750

 25,000 

1,300 2,050 3,100

4,250

8,000 11,500 12,500 15,500

 30,000 

1,375 2,150 3,300

4,500

8,250 12,000 13,750 16,500

 35,000 

1,400 2,250 3,500

4,750

8,500 13,000 14,000 17,000

 40,000 

1,425 2,400 3,650

4,950

8,700 14,000 14,750 18,000

 50,000 

1,600 2,450 3,900

5,350

9,500 14,500 16,000 20,000

 60,000 

1,650 2,625 4,150

5,650 10,000 15,500 17,300 21,000

 80,000 

1,825 2,800 4,570

6,250 11,000 17,000 18,750 23,000

 100,000 

2,000 3,100 4,950

6,700 12,000 18,000 20,000 25,000

 150,000 

2,250 3,400 5,650

7,700 13,000 21,000 23,000 28,500

 200,000 

2,450 3,800 6,200

8,450 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

Dimensions Inches (mm)

AMPERES REFER TO

FIG. NO.

SERIES

DIMENSIONS INCHES (mm)

A

B

C

D

E

F

G

1 – 30

1

JLLN

.875 (22.2)

—

.281 (7.1)

.406 (10.3)

—

—

—

JLLS

1.500 (38.1)

—

.281 (7.1)

.562 (14.3)

—

—

—

35 – 60

1

JLLN

.875 (22.2)

—

.281 (7.1)

.562 (14.3)

—

—

— 

2

JLLS

1.562 (39.7)

.812 (20.6)

.406 (10.3)

.994  (25.2)

.062 (1.6)

1.094 (27.8)

—

70 – 100

3

JLLN

2.156 (54.8)

1.562 (39.7)

.750 (19.1)

.812 (20.6)

.830 (21.1)

.281 (7.1)

.125 (3.2)

JLLS

2.953  (75.0)

2.352  (59.7)

.750 (19.1)

.828 (21.0)

1.625  (41.3)

.281 (7.1)

.125 (3.2)

110 – 200

3

JLLN

2.437 (61.9)

1.687 (42.9)

.875 (22.2)

1.062 (27.0)

.830 (21.1)

.343 (8.7)

.187 (4.8)

JLLS

3.250 (82.6)

2.507  (63.7)

.875 (22.2)

1.078  (27.4)

1.656 (42.1)

.343 (8.7)

.187 (4.8)

225 – 400

3

JLLN

2.750 (69.9)

1.843 (46.8)

1.000  (25.4)

1.312 (33.3)

.828 (21.0)

.406 (10.3)

.250 (6.4)

JLLS

3.625 (92.1)

2.718 (69.1)

1.000  (25.4)

1.593 (40.5)

1.712  (43.5)

.406 (10.3)

.250 (6.4)

450 – 600

3

JLLN

3.062 (77.8)

2.031 (51.6)

1.250 (31.8)

1.593 (40.5)

.875 (22.2)

.484 (12.3)

.312 (7.9)

JLLS

3.984 (101.2)

2.953 (75.0)

1.250 (31.8)

2.062 (52.4)

1.765 (44.8)

.484 (12.3)

.312 (7.9)

700 – 800

3

JLLN

3.375 (85.7)

2.218 

 

(56.4)

1.750 (44.5)

2.062 (52.4)

.875 (22.2)

.546 (13.9)

.375 (9.5)

JLLS

4.328 (109.9)

3.171 (80.6)

1.750 (44.5)

2.500 (63.5)

1.860 (47.2)

.546 (13.9)

.375 (9.5)

900 – 1200

3

JLLN

4.000  (101.6)

2.531 (64.3)

2.000  (50.8)

2.500 (63.5)

1.033 (26.2)

.609 (15.5)

.437 (11.1)

JLLS

5.271  (133.9)

3.801  (96.5)

2.000  (50.8)

2.625  (66.7)

2.303  (58.5)

.609 (15.5)

.437 (11.1)

1

26

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class G F

uses

Fuses – UL Class G

CLASS G - SLC CLASS G FUSES     

480/600 VAC • Time-Delay • 

1

/

2

-60 A

Web Resources

Download TC Curves, CAD drawings and other technical 
information: 

littelfuse.com/slc

Recommended Fuse Holders

LFG60 Series (1-20 A) ...................................................... 105 
LFG48 Series (25-60 A) .................................................... 105

A

B

C

D

AMP

DIMENSIONS INCHES (mm )

A

B

C

D

1

/

2

 – 15

1 

5

/

16

 (33.3)

3

/

8

 (9.5)

9

/

32

 (7.1)

13

/

32

 (10.3)

20

1 

13

/

32

 (35.7)

3

/

8

 (9.5)

9

/

32

 (7.1)

13

/

32

 (10.3)

25, 30

1 

5

/

8

 (41.3)

3

/

8

 (9.5)

9

/

32

 (7.1)

13

/

32

 (10.3)

35 – 60

2 

1

/

4

 (57.2)

3

/

8

 (9.5)

1

/

2

 (12.7)

13

/

32

 (10.3)

Dimensions

Ordering Information

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. 

Features/Benefits

•  Branch circuit rated
•  Current-limiting
•  100 kA interrupting rating
•  600 VAC rated 

1

/

2

-20 A

Applications

•  Branch circuit protection

QPL

Ferrule Version

SERIES AMP

PACKAGE 

QUANTITY

CATALOG  

NUMBER

ORDERING  

NUMBER

SLC

2

10

SLC002

0SLC002.T

Part Numbering System

0SLC  xxxx   H  

Package Quantity

Series

Amp Code

T = 10

Refer to Amp Code 

Column in Electrical 

Specifications Table

Specifications

Voltage Ratings 

 

600 VAC (

1

/

2

 – 20 A) 

 

480 VAC (25 – 60 A) 

 

170 VDC (

1

/

2

 – 60 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: E81895) 

 

CSA Certified (File: LR29862) 

 

Federal Specification WF-1814 

 (QPL-W-F-1814) 

Environmental

 

RoHS Compliant

1

27

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class CC/CD F

uses

Fuses – UL Class CC / CD

CLASS CC/CD - CCMR SERIES POWR-PRO

®

 FUSES

 

 

      600 Vac • Dual Element • Time-Delay • 

2

/

10

-60 A

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

Download TC Curves, CAD drawings and other technical 
information: 

littelfuse.com/ccmr

Recommended Fuse Holders

LFC600 Series ................................................................. 107 
L60030C Series ............................................................... 107 
LPSC Touch-Safe Series ....................................................117

Dimensions

Please refer to the Class CC/CD dimensions .................... 29

Peak Let-Thru Curve

10,000

100,000

1,000,000

PE

AK

 L

ET

-T

H

RU

 IN

 A

M

PE

R

ES

60A -

30A -

15A-

4A-

2.25A-

100

1,000

0

0

0

,

0

0

1

0

0

0

,

0

1

0

0

0

,

1

0

0

1

AVAILABLE FAULT CURRENT

SYMMETRICAL  R.M.S.  AMPERES

BASIS FOR DATA:

TEST VOLTAGE:

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       
11/12/12
C

9 OF 9

FCC05-CCMRP

CCMRP 2.25A - 30A

FOR CATALOG PAGE ONLY

- DATA GENERATED IN EXCEL -

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

Ordering Information

* Consult Motor Protection Tables on page 208 in the Technical Application Guide 

section for specific motor sizing information.

SERIES

AMP

ROHS CATALOG NUMBER

ORDERING NUMBER

CCMR

10

•

CCMR010

CCMR010.TXP

CCMR

45

CCMR045

CCMR045.T

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.

Features/Benefits

•  POWR-PRO

®

 Performance

•  Extremely current-limiting
•  Ratings up to 60 Amps
•  300 kA Interrupting Rating (self-certified)

Applications

•  Motor and motor branch circuit protection

Specifications

Voltage Rating  

AC: 600 Vac or less 

 

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)

Ampere Rating  

2

/

10

 – 60 A

Interrupting Rating 

AC:  200 kA rms symmetrical 

300 kA Littelfuse self-certified

 

DC: 20 kA

Approvals 

AC:  Standard 248-4, Class CC 

UL Listed 

2

/

10

-30 A (File: E81895) 

Standard 248, Class CD 

UL Listed 35-60 A (File: E81895) 

CSA Certified (File: LR29862)

 

DC: Littelfuse self-certified 

Material 

2/10-30 A:  Melamine body,  

Bronze cap (nickel plated)

Environmental  

RoHS Compliant (except 35-60 A)

Country of Origin  

Mexico

1

28

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

littelfuse.com

UL Class CC F

uses

Fuses – UL Class CC

Specifications

Voltage Rating  

AC: 600 Vac or less

 

DC: 300 Vdc

Ampere Range  

1

/

10

 – 30 A

Interrupting Rating 

AC: 200 kA rms symmetrical 

 

DC: 20 kA

Approvals 

AC:  Standard 248-4, Class CC 

UL Listed 

1

/

10

-30 A (File: E81895)  

CSA Certified 

1

/

10

-30 A (File: LR29862)

 

DC: Littelfuse self-certified

Material  

Melamine body

 

Bronze caps (nickel plated)

Environmental  

RoHS Compliant

Country of Origin  

Mexico

CLASS CC - KLDR / KLKR SERIES FUSES

KLKR Series
600 Vac/300 Vdc • Fast-Acting • 

1

/

10

-30 A

KLDR Series
600 Vac/300 Vdc • Time-Delay • 

1

/

10

-30 A

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 Rating  

AC: 600 Vac or less

 

DC: 300 Vdc

Ampere Range  

1

/

10

 – 30 A

Interrupting Rating 

AC: 200 kA rms symmetrical 

 

DC: 20 kA

Approvals 

AC:  Standard 248-4, Class CC 

UL Listed 

1

/

10

-30 A (File: E81895)  

CSA Certified 

1

/

10

-30 A (File: LR29862)

 

DC: Littelfuse self-certified

Material  

Melamine body

 

Bronze caps (nickel plated)

Environmental  

RoHS Compliant

Country of Origin  

Mexico

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

AMP

CATALOG 

NUMBER

ORDERING 

NUMBER

KLDR

10

KLDR010

KLDR010.TXP

Ordering Information

SERIES

AMP

CATALOG 

NUMBER

ORDERING 

NUMBER

KLKR

12

KLKR012

KLKR012.T

Recommended Fuse Holders

L60030C Series ....................................................107
LPSC Touch-Safe Series ........................................ 117

Dimensions

Please refer to the Class CC dimensions ............... 29

Recommended Fuse Holders

L60030C Series ....................................................107
LPSC Touch-Safe Series ........................................ 117

Dimensions

Please refer to the Class CC dimensions ............... 29

Web Resources

For additional information, visit:  

littelfuse.com/klkr

Web Resources

For additional information, visit:  

littelfuse.com/kldr

Description

KLDR fuses are time-delay fuses designed to 
protect control transformers, so le noids and 
similar inductive components 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.

1

29

littelfuse.com 

© 2018 Littelfuse POWR-GARD

®

 Products Catalog

UL Class CC/CD F

uses

Fuses – UL Class CC / CD

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

CLASS CC / CD DIMENSIONS AND CURRENT-LIMITING EFFECTS

Dimensions Inches (mm)

- DATA GENERATED IN EXCEL -

100 

1,000 

10,000 

100,000 

1,000,000 

100 

1,000 

10,000 

100,000 

PE

AK

 L

ET

- T

HRU

 IN

 A

M

PE

R

ES

 

AVAILABLE FAULT CURRENT 

SYMMETRICAL  R.M.S.  AMPERES 

8A - 

 

6A - 

 

4A - 

BASIS FOR DATA: 

TEST VOLTAGE: 

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        
11/12/12 
B 

2 OF 4  

FCC05-KLDRP 

KLDRP 4A - 30A 

10000

100000

200000

10

0

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

05542001

Peak Let-Thru Curve KLDR

Peak Let-Thru Curve KLKR

SHORT 

CIRCUIT 

CURRENT*

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS

2.25A 2.5A

3A

4A

5A

6.25A 7.5A

8A

10A

12A

15A

20A

30A

35A

40A

45A

50A

60A

5,000

203

224

287

289

460

472

442

437

359

369

435

355

621

1,170

1,240

1,320

1,070

1,525

10,000

256

282

361

364

580

595

557

551

452

465

548

447

783

1,480 1,565 1,670 1,355 1,930

15,000

293

323

413

416

664

681

637

631

517

532

627

512

896

1,695

1,795

1,915

1,555 2,200

20,000

323

356

455

458

730

750

702

694

569

585

690

563

987

1,870 1,980

2,110

1,710

2,430

25,000

348

383

490

493

787

808

756

748

613

630

743

607

1,063 2,015

2,135 2,275 1,845 2,620

30,000

370

407

521

524

836

858

803

795

651

670

790

645

1,129

2,145 2,270 2,420 1,965 2,780

35,000

389

429

548

552

880

903

845

837

686

705

832

679

1,189

2,260 2,390 2,550 2,070 2,885

40,000

407

448

573

577

920

944

884

875

717

737

870

709

1,243 2,360 2,500 2,665 2,165

3,025

50,000

438

483

617

622

991

1,017

952

942

772

794

937

764

1,339 2,545 2,695 2,875 2,330 3,200

60,000

466

513

656

661

1,053 1,081

1,012

1,001

821

844

995

812

1,423 2,705 2,865 3,055 2,480 3,350

80,000

513

564

722

727

1,159

1,190

1,114

1,102

903

929

1,096

894

1,566 2,985 3,160

3,365 2,730 3,540

100,000

552

608

778

783

1,249

1,282 1,200

1,187

973

1,001

1,180

963

1,687

3,215 3,405 3,630 2,945 3,685

150,000

632

696

890

897

1,430 1,467 1,373 1,359

1,114

1,146

1,351

1,102

1,931 3,685 3,905 4,160

3,375 4,030

200,000

696

766

980

987

1,574

1,615

1,511

1,496 1,226 1,261 1,487

1,213

2,125 4,060 4,300 4,580 3,720 4,230

*Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Current-Limiting Effects of CCMR (600 V) fuses

1