Bussmann FWX150 Semiconductor Fuse

FWX-150A is a fast-acting, high-current semiconductor fuse from Bussmann (Eaton Bussmann Electrical Division), engineered for protection in power-electronics circuits and rated for 150 A at 250 V (AC and DC). This bolt-on, stud-mount device uses a ceramic body and measures 3-1/8 inches in length and 1-7/32 inches in diameter, with an interrupt rating up to 200 kA at 250 V AC and 20 kA at 250 V DC. It carries an I²t melting rating of 1620 A²s, making it suitable for rapid clearing of short-circuit events in semiconductor power circuits; it is compatible with Bussmann 1BS fuse blocks. The FWX-150A is UL Recognized, CSA, and CE certified, and the family includes equivalents such as Littelfuse L25S and Mersen A30QS. Typical applications include high-current power supplies, motor drives, and inverters operating in 250 V systems, where robust protection and reliable performance are needed in industrial and electrical equipment.