Separate overload and short-circuit elements provide time delay for 125% of motor FLA sizing, linked with RK5 current limitation. 2:1 selective coordination ratio (within the cooper Bussmann RK fuse family) prevents electrical shutdowns from extending beyond the failed circuit. Insulated end caps for 110A-600A fuses reduces exposure to live parts and extends air gap to distance between blades of adjacent mounted fuses or to housing.