Choose FLSR400 when the design calls for a Littelfuse FLSR Series fuse at 400A and 600V AC / 300V DC. The series configuration provides dual-element Class RK5 fuse response together with 200kA AC interruption. Confirm application details against the manufacturer datasheet.
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For 400A applications, Littelfuse FLSR400 combines the FLSR Series platform with 600V AC / 300V DC capability. The documented package is Class R, paired with ferrule / blade (amp-dependent) terminals and 200kA AC interrupting performance. Published dimensions for this rating/configuration are 295.3mm length; ~66mm max body diameter. Its dual-element time-delay behavior is intended to ride through normal motor inrush while protecting against overloads and short circuits. Typical uses cover Motor, Transformer, Service Entrance, Feeder Circuits, general-purpose circuits. Check UL 248-12 and the manufacturer datasheet before final selection.
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