Bussmann By Eaton FWA-400A Semiconductor Fuse

The Bussmann by Eaton FWA-400A Semiconductor Fuse is a fast-acting high-speed fuse in Eaton’s Bussmann FWA family, engineered to protect power-electronic devices by interrupting fault currents quickly. It is rated for 400 A with a 150 VAC/VDC voltage rating, making it suitable for semiconductor protection in high-current DC and AC circuits such as DC buses, power supplies, drives, rectifiers, and other power-conversion assemblies. As a semiconductor fuse, the FWA-400A is designed to respond rapidly to overcurrent events to shield sensitive components while allowing normal operation under safe conditions. This form-factor is consistent with other FWA-series devices and is used where fast clearance of faults is required in motor drives, DC power stages, and solid-state converters. When selecting this fuse, verify that the maximum system voltage does not exceed 150 V and that the current rating provides adequate protection for the expected load and fault conditions, balancing reliable protection with minimizing nuisance blows.