Schneider Electric QOB350 Bolt-On Circuit Breaker

Schneider Electric’s QOB350 is a 50 A, 240 VAC, three-pole bolt-on miniature circuit breaker (Type QOB) designed for 3‑phase protection in bolt‑on panel interiors. With a 10 kA interrupt rating, it provides fast disconnection on overcurrents to protect conductors and connected equipment in commercial or light industrial distribution. As part of the Square D QO family, the QOB350 offers a bolt‑on mounting option for installations that require a bolted connection instead of plug‑on mounting. The three poles operate together to interrupt all live conductors in a 3‑phase circuit, enabling safe disconnection of motors, heaters, or other equipment drawing up to 50 A at 240 V. When selecting this breaker, confirm compatibility with a bolted‑on interior specified by Schneider Electric and follow the manufacturer’s installation guidelines and local electrical codes.