Bussmann FWH300 Cartridge Fuse High Interrupting Capacity

The Bussmann FWH300A high-interrupting-capacity cartridge fuse is a 300 A fast-acting protection device for high-energy power circuits, designed for AC and DC systems up to 1000 VAC and 800 VDC. It delivers an exceptionally high interrupting rating—up to 200 kAIC at 1000 VAC (50 kAIC at 500 VDC, depending on the variant)—making it suitable for power electronics, drives, rectifiers, and motor-control equipment where fault currents can spike. Terminations include blade-end styles or bolt-on studs, and the device is non-indicating, housed in a cartridge with approximately 4-11/32 inches (110 mm) OAL and 1-1/2 inches (38 mm) diameter. Typical approvals associated with Bussmann high-speed fuses in this family include UL 248-13, CSA, and CE, underscoring its use in industrial controls, power supplies, and other demanding applications.