Schneider Electric QO350 Three Phase Circuit Breaker

Schneider Electric’s Square D QO350 is a three-pole miniature circuit breaker rated for 50 A at 120/240 VAC, designed for plug-in installation in QO load centers and compatible enclosures. The QO350 provides thermal‑magnetic overcurrent protection for 3‑phase circuits with a 10 kA interrupt rating at 240 VAC, making it suitable for reliable protection of commercial or light industrial distribution that runs on a 3‑phase system. As part of the QO family, this 3P breaker is intended for use in Square D QO panels and related equipment, delivering a straightforward plug‑in replacement for protecting feeders and branch circuits up to 50 A. Common applications include safeguarding motors, pumps, HVAC equipment, and other 3‑phase loads in commercial buildings or service panels that employ QO breakers. When selecting this breaker, ensure the panel supports 3P 50A devices, and verify that the 120/240 VAC rating and 10 kAIC interrupt capacity meet your safety and system requirements. The QO350 is a trusted option within the Square D QO line for consistent, code‑compliant overcurrent protection in 3‑phase installations.