Bussmann RES400 Fuse

The Bussmann RES-400 is a renewable fuse rated at 400 A and 600 V, part of Eaton’s Bussmann RES family designed for high‑current protection in industrial and renewable‑energy power systems. Marketed as a Super Lag time‑delay device, the RES‑400 is intended to withstand brief inrush currents—such as those from large motors or power electronics—without nuisance tripping, while still interrupting sustained overloads to protect downstream equipment. With Class H construction and a 600 V AC rating, this fuse provides robust overcurrent protection for circuits where a slow‑blow response is required in commercial, industrial, and renewable installations. Typical applications include protection of feeders and power interfaces in solar and wind energy systems, battery energy storage interfaces, and other high‑current power pathways where 400 A protection at up to 600 V is appropriate. This fuse is designed to deliver reliable protection in demanding environments and is a staple option within the RES series for installations that demand a deliberate, in‑rush tolerant interruption characteristic.