Bussmann FWP-400A Very Fast Acting Fuse Through-Hole Mount

The Bussmann FWP-400A is a fast-acting high-speed semiconductor fuse designed to protect power electronics in high-current AC and DC circuits, rated at 400 A with a 700 V AC/DC rating. It offers an interrupt capability up to 200 kA at 700 VAC and 50 kA at 700 VDC, enabling reliable fault isolation for components such as diodes, SCRs, GTOs, and IGBTs in demanding drives, inverters, and traction applications. The FWP‑400A is configured as a North American style bolted-tag (stud) mount fuse, part of Eaton’s Bussmann series, with low arc voltage and low energy let-through for safer, faster protection in harsh electrical environments. It is UL Recognized, CSA, and CE certified, reflecting compliance across major global standards, and its 700 V rating suits mixed AC/DC systems common in industrial equipment and power conversion modules. Typical applications include protecting rectifier bridges, DC link circuits, motor drives, and other high-current semiconductor assemblies where rapid interruption is critical.