Bussmann FWX-45A Semiconductor Fuse 250VAC 45A

The Bussmann FWX-45A is a fast-acting semiconductor fuse rated for 45 A and 250 V (AC/DC), designed to protect power semiconductors and other fast-switching loads in electronic equipment. It features a cartridge-style, North American bolt-mount design and an I²t pre-arcing rating of 80 A²·s, indicating its energy tolerance before opening. As part of Eaton Bussmann’s FWX family, the 45A device is intended for use in protection circuits in power supplies, inverters, and similar power-electronics applications requiring reliable overcurrent protection for semiconductor devices. The FWX-45A is explicitly listed in official Bussmann/Eaton high-speed fuse catalogs as a 45 A, 250 V fuse, consolidating its role in safeguarding sensitive components in both AC and DC circuits.