General purpose onetime, NON cartridge 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. 1A to 60A fuses are UL listed Class K5 (50,000 AIR) with ferrule ends, 70A to 600A are UL listed Class H (10,000 AIR) with knife blade ends. 250V.