Bussmann by Eaton FWH-300 High Speed Fast Acting Fuse

The Bussmann by Eaton FWH-300A is a high-speed, fast-acting semiconductor fuse sized for demanding power electronics and industrial drives, delivering a 300 A RMS current rating in a rugged cartridge form. It is engineered for up to 1000 VAC and 800 VDC, with an interrupting capacity of 200 kAIC at 1000 VAC and 50 kAIC at 500 VDC, making it suitable for protecting power supplies, rectifier banks, motor drives, and other high-current semiconductor circuits. This non-indicating fuse occupies a North American style cartridge footprint and is available in configurations with blade-end or stud-mount terminals to match common panel and busbar assemblies. Typical physical dimensions for the standard NA variant are about 38.1 mm in diameter and 53 mm in length (1.5 in x 2.09 in), reflecting its sizable, robust construction designed to withstand industrial environments. The FWH family is widely used where rapid interruption is required to prevent damage from short circuits or overloads, and its I²t rating supports fast clearing at the rated voltage, ensuring protection of sensitive power electronics without significant nuisance openings. As part of Eaton’s Bussmann line, the FWH-300A is commonly found on power distribution panels, drives, and high-current rectifier modules that demand reliable, fast-acting overcurrent protection with UL Recognized, CSA, and CE certifications where applicable. This fuse is categorized for semiconductor protection and is explicitly marketed as a fast-acting device capable of quick response to overcurrent events, helping maintain system integrity and minimizing component damage.