Cooper Bussmann Lpn-Rk-500Sp Time Delay Fuses

The Bussmann LPN-RK-500SP is a non-indicating, time-delay Class RK1 fuse rated at 500 A and 250 V AC, part of the LPN-RK SP series. It is a dual-element, current-limiting device designed for feeder and branch circuits in large distribution switchboards, power panelboards, motor control centers, transformers, and other general-purpose loads. It carries an interrupting rating of 300 kA at 250 VAC and 100 kA at 125 VDC, enabling protection for high-energy circuits while tolerating brief inrush currents. This 500-amp variant is suitable where substantial inrush events occur and a reliable, slow-blow protection response is required; the SP suffix denotes the non-indicating version of the RK1 family, typically used with compatible Bussmann holders and switchgear in industrial electrical installations.