ABB OS400J03 Switch

ABB OS400J03 is a 3-pole, 400 A fusible disconnect switch in ABB’s POWERLINE OS series, engineered for front-operated isolation with Class J fuses. This left-side configuration (03) ships without a handle or shaft and is designed for installation in industrial switchgear and distribution panels. The device combines manual disconnection with fuse protection for feeders and motor circuits, providing safe isolation while protecting downstream equipment. Rated for up to 600 V AC, the OS400J03 accepts Class J fuses and delivers 400 A across its three poles, making it suitable for three-phase power networks in industrial environments. In practice, it serves as a protected disconnect point within panel assemblies, enabling maintenance isolation while maintaining circuit protection. This model is part of ABB’s robust OS-series fusible switches, designed to integrate with ABB’s broader power distribution products and to support reliable, compliant installations in harsh industrial settings.