The Littelfuse FLNR_ID Series catalog number FLNR050ID is rated 50A for 250V AC / 125V DC service. Electrical protection is based on indicating Class RK5 fuse behavior and 200kA AC interrupting capability. Visual blown-fuse indication is part of the series design. Use the Littelfuse datasheet to verify final circuit suitability.
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Littelfuse identifies FLNR050ID as a 50A FLNR_ID Series fuse for 250V AC / 125V DC applications. Mechanically it uses a Class R format for cartridge / clip installation; electrically it is rated to interrupt 200kA AC. Published dimensions for this rating/configuration are 76.2mm length; 20.7mm max body diameter. The indicator window provides visual blown-fuse status to support faster troubleshooting. The listed application set includes Service Entrance, Transformer, Switchboard Mains, Motor Branch Circuits, general-purpose circuits; final coordination should follow UL 248-12 and Littelfuse documentation.
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