Bussmann 170L5714 Fuse 400 Amp 1000 Volt Industrial

The Bussmann 170L5714 is an industrial high‑speed square‑body fuse from the Eaton Bussmann Electrical Division, engineered as main protection for high‑power AC circuits and power‑electronics loads. It is rated for 400 A at 1,000 V AC, with a utilization category of aR (accompanied semiconductor protection) and a top fuse status indicator for quick visual checks in panels. The device uses a square‑body construction with slotted center‑bolted tags, a center‑to‑center mounting distance of 108 mm, and an M10 mounting dimension, identified as a 1‑size fuse in its catalog. It provides a 200 kA breaking capacity at its rated voltage and measured watt losses around 70 W, and it is RoHS compliant. Typical applications include main protection in industrial cabinets and distribution buses, as well as protection for semiconductor power stages, inverters, and rectifier sections where 1 kV AC service is involved and the system design accounts for fault current, waveform, and mounting constraints.