Schneider Electric QOB350 Bolt-On Circuit Breaker

Schneider Electric's QOB350 is a bolt-on, three-pole miniature circuit breaker from the Square D QOB line designed to protect three‑phase circuits in commercial and industrial panels. It is rated for 50 A and 240 V AC with a 10 kA interrupting capacity, delivering reliable overcurrent protection for motors, pumps, compressors, conveyors, and other three‑phase equipment. The device employs a thermal-magnetic trip mechanism and is intended for bolt-on mounting in Schneider Electric QOB load centers and compatible panels, ensuring secure mechanical attachment and consistent protection across all three phases. As a 3P unit, it trips all phases together to safeguard against overloads and short circuits, and it carries UL/CSA certification for safety and reliability. With its 50 A rating and bolt-on construction, the QOB350 is well suited for branch circuits that feed higher‑current three‑phase loads in installations requiring a bolt-on breaker solution.