General Purpose Fuses

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KLNR/KLSR Class RK1 Fuses

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

Specifications

Voltage Ratings:

AC: 250 Volts (KLNR); 600 Volts (KLSR)

DC: 125 Volts (1 – 600A KLNR);

250 Volts (1 – 30A KLSR);

300 Volts (35 – 600A KLSR).

Interrupting Ratings:

AC: 200,000 am­peres rm­s sym­m­etrical

DC: 20,000 am­peres

Ampere Range:

1 – 600 am­peres.

Approvals:

AC: Standard 248-12, Class RK1

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

DC: Littelfuse self-certified

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

Exam­ple part num­ber (series & am­perage): KLNR 200

Recommended Fuse Blocks

LR250 series (for KLNR series fuses)

LR600 series (for KLSR series fuses)

Refer to the Blocks & Holders section of this catalog for additional inform­ation.

KLNR/KLSR series RK1 fuses were the earliest type of current-limiting

fuses developed. Their single-element, silver link design enables them

to provide fast-acting overload and short-circuit protection. When used

to protect inductive loads such as motors, solenoids, and transformers,

KLNR/KLSR series fuses must be greatly oversized to prevent opening

the fuses on harmless in-rush currents. In such applications, KLNR/

KLSR series fuses may only provide short-circuit protection.

dual-element, time-delay fuses in all new applications requiring the

current-limiting ability of UL Class RK1 fuses. POWR-PRO LLNRK/

LLSRK series fuses are also recommended 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

Molded case circuit breaker load centers and panelboards have

increased interrupting ratings when series rated with Littelfuse

KLNR/KLSR Class RK1 fuses. Refer to panelboard manufacturer’s

literature for UL Listed combination of fuses and panelboards. Series

ratings up to 200,000 amperes are available.

Safety

• 200,000 A.I.R. — Reliable interruption of all overcurrents up to

200,000 amperes.

• Extremely current-limiting — Stops damaging short-circuit current

faster than any mechanical protective device.

• Fast-acting — Provides fast acting protection to equipment such

as variable speed drives, rectifiers and other equipment containing

surge-sensitive components.

Longer Equipment Life

• Current-limiting design reduces damage to equipment caused by

heating and magnetic effects of short-circuit currents.

Economical

• Extremely current-limiting — often permits use of readily available,

less costly equipment.

• Used as input or output fuses for surge sensitive components such

as variable speed drives and rectifiers, fast acting KLNR/KLSR fuses

may prevent opening of expensive semiconductor fuses protecting

individual components.

Easy To Use

• 200,000 A.I.R. rating minimizes need for short-circuit calculations.

Dimensions

• Refer to FLNR_ID for KLNR dimensions and FLSR_ID for KLSR

dimensions.