Cooper Bussmann FWX-400A Semiconductor Fuse

The Cooper Bussmann FWX-400A is a semiconductor fuse rated for 400 amperes, intended to protect circuits that power semiconductor devices from overcurrent events across various equipment and systems. Identified by the FWX-400A model number, this device is part of Cooper Bussmann’s lineup of protective fuses designed for high-current electronics. As a semiconductor fuse, its function is to interrupt current when a fault or surge exceeds safe operating levels, helping prevent damage to power supplies, drives, inverters, and other semiconductor-based equipment. With a 400 A rating, the FWX-400A provides a clear specification for selecting protective devices in systems where substantial current needs to be interrupted to safeguard sensitive components. Semiconductor fuses like the FWX-400A are commonly used in power supplies, motor control electronics, inverters, and other high-current semiconductor assemblies to quickly interrupt fault currents and protect downstream circuitry. Designed for use in demanding, high-current environments such as industrial power electronics and energy storage interfaces.