Bussmann SC-40 Time Delay Fuse

Bussmann SC-40 Time Delay Fuse is a 40 A, Class G, current-limiting fuse in the SC Series designed for 480 VAC and 300 VDC circuits. This non-indicating, ferrule-terminal device uses a dual-element construction housed in a cylindrical melamine body measuring 0.406 in (10.3 mm) in diameter and 2.25 in (57 mm) long, with a rejection-style end to prevent inadvertent insertion. It carries a 100 kA interrupting rating at 480 VAC and 10 kA at 300 VDC, providing robust protection for power circuits against short circuits and sustained overloads. The SC-40 is a time-delay fuse, meaning it permits short-duration overloads and inrush currents while still interrupting on longer faults, and it is rated for continuous operation at 40 A. Typical response characteristics place trip times around 12 seconds at roughly 200% of the rated current, reflecting its balance between nuisance protection and fault protection. The SC-40 is part of Bussmann’s SC Series, which are cylindrical, dual-element fuses with ferrule-terminals and a melamine body designed for reliable performance in industrial electrical systems.