Bussmann 400NHG3B-690 High-Voltage Electrical Fuse

400NHG3B-690 is an Eaton Bussmann Series NH fuse designed for high-current protection in industrial power distribution. This NH3 (Size 3) fuse is rated for 400 A and supports up to 690 V AC, making it suitable for main feeders and branch circuits in switchgear and distribution panels operating at up to 690 VAC. It belongs to the NH family of gG/gL fuse links, intended for general-purpose protection of a broad range of loads. The '3B' designation identifies the dual-indicator variant, which provides a visible blown-fuse indicator to simplify status checks in control cabinets and panelboards. The fuse is designed to mount in standard NH fuse holders and blocks, aligning with NH-size geometry for reliable installation in industrial electrical assemblies. This model is widely stocked and referenced as 400NHG3B-690, a 400 A, 690 V, NH3 dual-indicator fuse suitable for use with NH-series protection in equipment such as distribution boards, feeders, and motor circuits in industrial environments. It is compatible with NH-series Class CGGGL fuse blocks.