Bussmann LPN-RK-400 High Current Class RK5 Fuse

The Bussmann LPN-RK-400 is a high‑current Class RK5 fuse rated for 400 A at 250 V, designed to protect heavy‑duty low‑voltage circuits in industrial settings. It belongs to the Bussmann Low‑Peak RK family (LPN‑RK), a line of RK fuses that emphasizes a lower peak let‑through profile while delivering time‑delay protection for circuits that experience brief surges. RK5 fuses are widely used in large distribution equipment such as switchboards, power panelboards, motor control centers, and machinery disconnects, and are intended for use with standard RK5 fuse blocks and holders in industrial installations. The 400 A, 250 V LPN‑RK‑400 is documented in Eaton/Bussmann catalogs and fuseology literature as part of the RK5 lineup, illustrating its function in protecting feeders and heavy‑duty loads in facilities with motors and other high‑inrush equipment. Typical placement includes feeders from main switchgear to subpanels in factories, processing plants, and similar settings where reliable, coordinated protection is essential. This fuse adheres to Bussmann's RK5 design philosophy and is compatible with modular fuse blocks used in industrial switchgear.