Bussmann FWH-500A Semiconductor Fuse

The Bussmann FWH-500A Semiconductor Fuse is a high-speed, non-indicating cartridge fuse in Eaton’s Bussmann series, engineered to protect power semiconductors in high-current circuits. It provides a 500 A rating and supports a 500 VAC or 500 VDC operating voltage, enabling use in both AC and DC power electronics. The device offers an impressive interrupt capability—up to 200 kAIC at 1000 VAC and 50 kAIC at 500 VDC—allowing rapid fault clearance in demanding systems. Designed specifically for semiconductor protection, the FWH-500A is built for reliability in drives, inverters, and power supplies where large current surges must be interrupted quickly. As with other FWH family devices, termination configurations vary by variant, so the exact end style and mounting method should be confirmed on the order or datasheet for your particular assembly. In sum, the FWH-500A delivers robust overcurrent protection for high‑current power electronics at 500 A and up to 500 V, making it a fitting choice when fast fault clearing and high interrupt ratings are required.