170M7217

The 170M7217 is a Bussmann 170M square-body high-speed fuse, a current-limiting fuse rated 1250 Vac and 850 Vdc at 1400 A in the size 4 body. It is built to protect a power semiconductor in a high-power converter, where the fault current must be interrupted in less than half a cycle and the let-through energy kept as low as possible. The square-body construction bolts directly onto a busbar with a low-inductance connection, so it suits the DC link of a large drive, a rectifier, an inverter or a traction converter, and its ultra-fast aR characteristic opens long before the device junction would fail. Bussmann square-body fuses cover size 000 up to size 5 and voltages from 690 V to more than 2000 V, so the same family runs from a medium drive to a utility-scale converter. Coordinate the fuse with the device it protects: compare the fuse clearing I-squared-t with the device withstand I-squared-t at the prospective fault current, confirm the fuse clears first, and match the voltage class to the bus with margin. Every fuse BeiLuo ships is factory-traceable and includes an import declaration, a certificate of origin and a RoHS compliance file. Availability of large square-body ratings is confirmed per project, and BeiLuo reserves supply against your forecast.