Square D QO3501021N Molded Case Circuit Breaker

Square D QO3501021N is a 50 A, three‑pole molded‑case circuit breaker from Schneider Electric’s Square D QO family. Rated for 240 V AC, it provides overload and short‑circuit protection for three‑phase circuits with an interrupting capacity of 10 kA at 240 V. This plug‑in device is designed for use in compatible QO panels and bus systems, offering reliable protection for feeders and branch circuits in commercial or light industrial installations. The model is listed as a QO series unit with an AC shunt, aligning with remote‑trip configurations when used in safety interlock or emergency stop schemes. Common applications include protection of 3‑phase motors, pumps, conveyors, and other 50 A, 240 V loads. As part of the QO lineup, it supports standard QO mounting and accessories, ensuring compatibility with Schneider Electric’s mounting rails and add‑on trip devices.