Bussmann FWH-300A High Speed Semiconductor Fuse

The Bussmann (Eaton Bussmann series) FWH-300A High Speed Semiconductor Fuse is a North American style cartridge fuse designed to protect power electronics and semiconductor loads in AC and DC circuits. It is rated for 300 A RMS with a voltage rating of 1000 VAC / 800 VDC, and it delivers a high-speed interrupt performance with 200 kAIC at 1000 VAC and 50 kAIC at 500 VDC. This non-indicating fuse is available with blade-end terminals or stud terminals for flexible mounting, and its compact form measures about 1.69 in long (depth) by 1.61 in high by 4.52 in wide, weighing roughly 0.52 lb. The FWH-300A complies with UL Recognized, CSA Certified, CE Marked and RoHS standards, reflecting its suitability for routine electronics protection. Typical applications include protecting power supplies, DC bus connections, inverters, and motor drives in high-energy environments where rapid fault clearing is essential. The device lists a watt loss of 51 W under rated conditions and is identified by catalog number FWH-300A as part of Bussmann’s high-speed fuse family used in North American fuse links.