LFR Series - Class R Indicating Fuse Blocks

Series: LFR
Questions? Contact Littelfuse Support
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The new Littelfuse Class H and R blocks offer many advantages over previous generations that are noted in the features and benefits section. Class H and Class R fuse blocks are dimensionally the same, but Class R blocks incorporate a rejection feature, which only allows Class R fuses to be inserted.

Features & Benefits
  • Indication offered on most 250V and 600V versions
  • DIN Rail releasable for all non-knife blade style fuses
  • Only one hand is required to release from DIN Rail (lock open lock closed)
  • Universal mounting holes make for easy replacement
  • Clip designs maximize electrical contact and minimize heat rise
  • Reinforcing clips are standard on all Class R fuse blocks

Product Literature

Littelfuse POWR-Gard Catalog

Access specifications, certifications, check availability and order parts below

Catalog #Fuse TypeIndicatingStockSamplesCompare
LFR250301CClass RNoCheckOrder
LFR250301PClass RNoCheckOrder
LFR250301SClass RNoCheckOrder
LFR250302CClass RNoCheckOrder
LFR250302PClass RNoCheckOrder
LFR250302SClass RNoCheckOrder
LFR250303CClass RNoCheckOrder
LFR250303PClass RNoCheckOrder
LFR250303SClass RNoCheckOrder
LFR250601CCheckOrder
LFR250601CIDClass RYesCheckOrder
LFR250602CCheckOrder
LFR250602CIDClass RYesCheckOrder
LFR250603CCheckOrder
LFR250603CIDClass RYesCheckOrder
LFR251001CCheckOrder
LFR251001CIDClass RYesCheckOrder
LFR251003CCheckOrder
LFR251003CIDClass RYesCheckOrder
LFR252001CClass RNoCheckOrder
LFR252003CClass RNoCheckOrder
LFR254001CClass RNoCheckOrder
LFR254003CClass RNoCheckOrder
LFR256001CClass RNoCheckOrder
LFR256003CClass RNoCheckOrder
LFR600301CCheckOrder
LFR600301CIDClass RYesCheckOrder
LFR600301PCheckOrder
LFR600301PIDClass RYesCheckOrder
LFR600301SCheckOrder
LFR600301SIDClass RYesCheckOrder
LFR600302CCheckOrder
LFR600302CIDClass RYesCheckOrder
LFR600302PCheckOrder
LFR600302PIDClass RYesCheckOrder
LFR600302SCheckOrder
LFR600302SIDClass RYesCheckOrder
LFR600303CCheckOrder
LFR600303CIDClass RYesCheckOrder
LFR600303PCheckOrder
LFR600303PIDClass RYesCheckOrder
LFR600303SCheckOrder
LFR600303SIDClass RYesCheckOrder
LFR600601CCheckOrder
LFR600601CIDClass RYesCheckOrder
LFR600601CID-HXClass RYesCheckOrder
LFR600602CCheckOrder
LFR600602CIDClass RYesCheckOrder
LFR600602CID-HXClass RYesCheckOrder
LFR600603CCheckOrder
LFR600603CIDClass RYesCheckOrder
LFR600603CID-HXClass RYesCheckOrder
LFR601001CCheckOrder
LFR601001CIDClass RYesCheckOrder
LFR601003CCheckOrder
LFR601003CIDClass RYesCheckOrder
LFR602001CClass RNoCheckOrder
LFR602003CClass RNoCheckOrder
LFR604001CClass RNoCheckOrder
LFR604003CClass RNoCheckOrder
LFR606001CClass RNoCheckOrder
LFR606003CClass RNoCheckOrder

  • Showing 7 items
    • LLSRK_ID
      UL Class RK1 Dual Element Time-Delay Fuse

    • Amps (A): 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.125, 1.25, 1.4, 1.6, 1.8, 2, 2.25, 2.5, 2.8, 3 more

    • Interrupting Rating: 20 kA @ 300 Vdc

    • Opening: Slo-Blo/Time Lag (T)/Time Delay

    • LLNRK
      UL Class RK1 Dual Element Time-Delay Fuse

    • Amps (A): 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.125, 1.25, 1.4, 1.6, 1.8, 2, 2.25, 2.5, 2.8, 3, 3.2 more

    • Interrupting Rating: 20 kA @ 125 Vdc

    • Opening: Slo-Blo/Time Lag (T)/Time Delay

    • KLSR
      UL Class RK1 Fast Acting Fuse

    • Amps (A): 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80 more

    • Interrupting Rating: 20 kA @ 250 Vdc, 20 kA @ 300 Vdc, 200 kA @ 600 Vac

    • Opening: Fast-Acting (F)

    • KLNR
      UL Class RK1 Fast-Acting Fuses

    • Amps (A): 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80 more

    • Interrupting Rating: 20 kA @ 125 Vdc

    • Opening: Fast-Acting (F)

    • IDSR
      UL Class RK5 Dual-Element Time Delay Fuses With Indication

    • Amps (A): 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.125, 1.25, 1.4, 1.5, 1.6, 1.8, 2, 2.25, 2.5, 2.8 more

    • Interrupting Rating: 20 kA @ 600 Vdc

    • Opening: Slo-Blo/Time Lag (T)/Time Delay

    • FLSR_ID
      UL Class RK5 Dual-Element Time-Delay Fuses With Indication

    • Amps (A): 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.125, 1.25, 1.4, 1.5, 1.6, 1.8, 2, 2.25, 2.5, 2.8 more

    • Interrupting Rating: 20 kA @ 300 Vdc

    • Opening: Slo-Blo/Time Lag (T)/Time Delay

    • FLNR_ID
      UL Class RK5 Dual-Element Time-Delay Fuses With Indication

    • Amps (A): 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450 more

    • Interrupting Rating: 300 kA @ 250 Vdc

    • Opening: Slo-Blo/Time Lag (T)/Time Delay

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
LFR250301C 250V CLASS R BLOCK 30A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250301P 250V CLASS R BLOCK 30A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250301S 250V CLASS R BLOCK 30A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250302C 250V CLASS R BLOCK 30A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250302P 250V CLASS R BLOCK 30A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250302S 250V CLASS R BLOCK 30A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250303C 250V CLASS R BLOCK 30A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250303P 250V CLASS R BLOCK 30A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250303S 250V CLASS R BLOCK 30A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250601C 250V CLASS R BLOCK 60A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250601CID 250V CLASS R BLOCK 60A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250602C 250V CLASS R BLOCK 60A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250602CID 250V CLASS R BLOCK 60A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250603C 250V CLASS R BLOCK 60A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR250603CID 250V CLASS R BLOCK 60A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR251001C 250V CLASS R BLOCK 100A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR251001CID 250V CLASS R BLOCK 100A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR251003C 250V CLASS R BLOCK 100A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR251003CID 250V CLASS R BLOCK 100A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR252001C 250V CLASS R BLOCK 200A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR252003C 250V CLASS R BLOCK 200A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR254001C 250V CLASS R BLOCK 400A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR254003C 250V CLASS R BLOCK 400A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR256001C 250V CLASS R BLOCK 600A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR256003C 250V CLASS R BLOCK 600A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600301CID 600V CLASS R BLOCK 30A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600301PID 600V CLASS R BLOCK 30A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600301SID 600V CLASS R BLOCK 30A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600302CID 600V CLASS R BLOCK 30A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600302PID 600V CLASS R BLOCK 30A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600302SID 600V CLASS R BLOCK 30A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600303CID 600V CLASS R BLOCK 30A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600303PID 600V CLASS R BLOCK 30A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600303SID 600V CLASS R BLOCK 30A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600601CID 600V CLASS R BLOCK 60A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600602CID 600V CLASS R BLOCK 60A 2 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR600603CID 600V CLASS R BLOCK 60A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR601001CID 600V CLASS R BLOCK 100A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR601003CID 600V CLASS R BLOCK 100A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR602001C 600V CLASS R BLOCK 200A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR602003C 600V CLASS R BLOCK 200A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR604001C 600V CLASS R BLOCK 400A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR604003C 600V CLASS R BLOCK 400A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR606001C 600V CLASS R BLOCK 600A 1 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
LFR606003C 600V CLASS R BLOCK 600A 3 POLE RoHS No 07/10/2012 PbFree No 07/10/2012 No
07/10/2012
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please complete the Product Environmental Information Request Form.