KLNR Series - UL Class RK1 Fast-Acting Fuses

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KLNR/KLSR series RK1 fast-acting fuses were the earliest type of current-limiting fuse 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 inrush currents. In such applications, KLNR/KLSR series fuses may only provide short-circuit protection.

We recommend using POWR-PRO™ LLNRK/LLSRK series RK1, dual-element, time-delay fuses in all new applications requiring the current-limiting ability of UL Class RK1 fast-acting 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
  • Molded case circuit breaker load centers and panelboards have increased interrupting ratings when “series rated” with Littelfuse KLNR/KLSR Class RK1 fast-acting 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 fast-acting 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 for KLNR dimensions and FLSR for KLSR dimensions.

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VAC (V)VDC (V)Interrupting RatingOpeningSizeStockSamplesCompare
KLNR001125012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR002225012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR003325012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR004425012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR005525012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR006625012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR008825012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0101025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0121225012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0151525012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0202025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0252525012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0303025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0353525012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0404025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0454525012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0505025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0606025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0707025012520 kA @ 125 VdcFast-Acting (F)Industrial CartridgeCheckOrder
KLNR0808025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR0909025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR10010025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR11011025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR12512525012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR15015025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR17517525012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR20020025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR22522525012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR25025025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR30030025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR35035025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR40040025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR45045025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR50050025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder
KLNR60060025012520 kA @ 125 VdcFast-Acting (F)Knife-BladeCheckOrder

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