12

SPECIFICATIONS

Voltage Ratings: AC: 250 Volts (LLNRK)

600 Volts (LLSRK)

DC: 125 Volts (LLNRK)

300 Volts (LLSRK)

Interrupting Ratings:

AC: 200,000 amperes rms symmetrical

300,000 amperes rms symmetrical

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 1/10 – 600 amperes

Approvals:

AC: Standard 248-12, Class RK1

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

QPL: Federal Specification No. WF-1814

DC: Littelfuse self-certified

AMPERE RATINGS

1

25

90

300

15

3

7

30

100

350

2

8

35

110

400

1

9

40

125

450

3

4

10

45

150

500

4

12

50

175

600

1

2515

60

200

6

70

225

8

6

2080250

* LLSRK Only.

Example part number (series & amperage): LLNRK 450

RECOMMENDED FUSE BLOCKS

LR250 series (LLNRK Series)

LR600 series (LLSRK Series)

Refer to Fuse Block section of this catalog for additional

information.

FEATURES/BENEFITS

s

Extremely current limiting — Reduces damage to circuits

and equipment under short-circuit conditions. Stops

damaging short circuits faster than any mechanical

protective device.

s

300kA Interrupting Rating — Littelfuse self-certified to

300,000 amperes as standard. Meets future trend towards

higher available short circuit currents.

s

Reduced costs — Current limiting design often permits

use of readily available, less costly equipment. Low

resistance design reduces power consumption and utility

bills.

s

Excellent time delay — True dual-element construction,

with separate non-fatiguing thermally-reversible spring-

loaded thermal overload element, withstands repeated

surges within rated time delay without opening needlessly.

Eliminates needless downtime caused by power surges or

equipment demands.

provide superior overload and short circuit protection for

service entrance, main, feeder and general-purpose branch

circuits up to 600 amperes.

LLNRK/LLSRK series fuses can be installed in existing Class

H fuse blocks to upgrade systems containing lower interrupt-

ing rating Class H one-time or renewable fuses.

APPLICATIONS

All general-purpose circuits

Motors

Transformers

Solenoids

Fluorescent lighting

All system components with high in-rush currents