General Purpose Fuses KLNR/KLSR Class RK1 Fuses 250/600 VAC • Fast Acting • 1 – 600 Amperes Applications General Purpose Fuses 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 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. • 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 We recommend using POWR-PRO LLNRK/LLSRK series Class RK1, 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. • 200,000 A.I.R. rating minimizes need for short-circuit calculations. Specifications Ampere Ratings ® 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 Dimensions • Refer to FLNR_ID for KLNR dimensions and FLSR_ID for KLSR dimensions. 1 2 3 4 5 6 8 10 12 15 20 25 30 35 40 45 50 60 70 80 90 100 110 125 150 175 200 225 250 300 350 400 450 500 600 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. 34 www.littelfuse.com © 2005 Littelfuse • POWR-GARD™ Products Catalog General Purpose Fuses KLNR/KLSR Class RK1 Fuses 250/600 VAC • Fast Acting • 1 – 600 Amperes 200 100 80 60 100 80 60 40 30 40 30 20 20 10 8 6 10 8 6 200A 400A 600A 60000 80000 100000 30000 40000 20000 6000 8000 10000 3000 4000 2000 600 800 1000 300 400 200 5 60000 80000 100000 30000 40000 20000 .01 6000 8000 10000 .02 .01 3000 4000 .02 2000 .04 .03 600 800 1000 .04 .03 300 400 .1 .08 .06 200 .2 .1 .08 .06 60 80 100 .4 .3 .2 30 40 .4 .3 20 1 .8 .6 10 1 .8 .6 30 40 2 20 2 4 3 10 4 3 60A 100A 30A 400 300 200 TIME IN SECONDS 400 300 TIME IN SECONDS 1000 800 600 General Purpose Fuses 1000 800 600 60 80 100 400A 600A 200A 60A 100A KLSR 30A KLNR CURRENT IN AMPERES CURRENT IN AMPERES 549001 548001 KLNR KLSR 1000000 800000 600000 1000000 800000 600000 400000 300000 400000 300000 200000 200000 600A 400A 20000 200A 100A 60A 10000 8000 6000 4000 3000 30A 2000 1000 800 600 600A 400A 40000 30000 200A 20000 100A 10000 8000 6000 60A 30A 4000 3000 2000 1000 800 600 400 300 400 300 200 200 AVAILABLE FAULT CURRENT SYMMETRICAL R. M. S. AMPERES 05548002 © 2005 Littelfuse • POWR-GARD™ Products Catalog 200000 60000 80000 100000 30000 40000 20000 6000 8000 10000 3000 4000 2000 600 800 1000 300 400 100 200 200000 60000 80000 100000 30000 40000 20000 6000 8000 10000 3000 4000 2000 600 800 1000 300 400 200 100 100 100 PEAK LET-THRU IN AMPERES 40000 30000 100000 80000 60000 PEAK LET-THRU IN AMPERES 100000 80000 60000 AVAILABLE FAULT CURRENT SYMMETRICAL R. M. S. AMPERES www.littelfuse.com 35