Eaton Bussmann 170M6143 Fuse

The Eaton Bussmann 170M6143 is a high-speed square-body fuse rated for 550 A at 1.25 kV (1250 V), part of the Bussmann Series designed to protect semiconductor power circuits and high‑current power electronics from overcurrent events. This AR-class (aR) fuse uses copper terminals (CU) and a square-body design, making it suitable for fast-acting protection in equipment such as rectifier banks, DC-link circuits, motor drives, and other power-converter assemblies. With a 1250 V maximum rating, it provides robust short‑circuit interrupting capability while helping maintain system uptime by opening quickly when an overcurrent occurs. As a member of Eaton's Bussmann high‑speed fuse family, it is specified for applications requiring 550 A at 1250 V and AR-class protection in industrial power electronics.