The Bussmann FWP-400A is a fast-acting semiconductor fuse from Eaton’s Bussmann series designed to protect power‑electronic devices by interrupting fault currents in high‑current AC or DC circuits. It carries a 400 A current rating and is rated for up to 700 VAC and 700 VDC, with an interrupting capacity of up to 200 kAIC at 700 VAC and 50 kAIC at 700 VDC, making it suitable for protecting IGBTs, diodes, and other power semiconductors in inverters, motor drives, and high‑energy power supplies. Supplied in North American style high‑speed cartridge form, the FWP‑400A is part of a family designed for rapid response in demanding electrical protection applications.
