Square D SD75400 Industrial Grade Circuit Breaker

Square D SD75400 Busway Circuit Breaker Plug-In Unit is an industrial‑grade protective device designed for use with Square D busway systems. This plug‑in unit provides overcurrent protection for feeders in a busway distribution network, rated at 100 A and 600 V, enabling reliable interruption of faults and safe isolation of loads in demanding environments. Built to fit Square D busway frames, the SD75400 supports quick installation and coordination with other protection devices across a facility’s power distribution. The SD75400 serves as a modular protection point for branch circuits connected to the busway, allowing targeted maintenance and scalable expansion without major rewiring. With rugged construction and compatibility with Square D busway plug‑in configurations, this unit provides a compact, serviceable solution for protecting critical loads in harsh operating conditions.