Product Information for Bussmann FWH-250A Bussmann Fuse Item# FWH-250A - Fuse, 250A, 500VAC, Semiconductor, Bladed FWH Series Information .25~ 1600 Amps 500V AC/ DC For Semiconductor Protection Cartridge or Center Bolted UL, CSA Approvals Bussmann offers a complete range of high speed fuses for the protection of semiconductors. Their design and construction have been optimized to provide excellent performance, making them the ideal solution for medium power applications. Low Energy Let-Through Low Watts Loss Superior Cycling Capability Low Arc Voltage