English Electric GSB 400A Semiconductor Fuse

The English Electric GSB 400A Semiconductor Fuse is a high-current protective device with a 400 A rating and a 1,000 V AC maximum operating voltage. Manufactured by English Electric and identified by the GSB designation, this semiconductor fuse is engineered to interrupt overcurrent events in electrical circuits that operate at or below its voltage rating. With a 400 A current-handling capacity, it serves as a critical safety component in power distribution equipment and industrial systems that require dependable protection for heavy loads and downstream electronics. The 1,000 V AC rating indicates suitability for medium- to high-voltage environments commonly found in industrial controls, switchgear, and electrical panels where reliable circuit protection is essential. By selecting the GSB 400A, users align with English Electric’s line of semiconductor fuses designed to isolate fault conditions and help protect equipment from damage due to short circuits and overloads.