General-purpose one-time, NON fuse. For use in non-current limiting lighting circuits, main panel protections, or other circuits that do not contain large electric motors. No time delay. UL (Underwriter's Laboratories) listed Class K5 (50,000 AIR) with ferrule ends. 250V. Amperage: 40A Fuse Type: NON Fuse Function: General Purpose Class: K5 Diameter: 13/16 In. Length: 3 In. Voltage: 250V Certification: UL Listed