Part FLNR400ID is a 400A member of the Littelfuse FLNR_ID Series with a 250V AC / 125V DC rating. Its protection profile centers on indicating Class RK5 fuse operation plus 200kA AC fault interruption. Visual blown-fuse indication is part of the series design. Use the Littelfuse datasheet to verify final circuit suitability.
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FLNR400ID is Littelfuse’s 400A configuration in the FLNR_ID Series, built as a Indicating Dual-Element Time-Delay Class RK5 Fuse for 250V AC / 125V DC service. A Class R body supports cartridge / clip installation, and the manufacturer lists 200kA AC as the principal interrupting capability. Published dimensions for this rating/configuration are 219.1mm length; 50.8mm 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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