Schneider Electric QOB320N Three-Phase Circuit Breaker

Schneider Electric’s QOB320 is a three-pole, 20-amp miniature circuit breaker in the Square D QO line, rated for 240V AC and designed for bolt-on installation in compatible panels. This thermal-magnetic device delivers a 10,000-amp interrupting capacity (10 kA) at 240V, enabling it to safely interrupt short-circuit faults on three-phase circuits and protect feeders and equipment in commercial and light-industrial panels. The bolt-on mounting and QO form factor are compatible with standard QO enclosures, making it a straightforward replacement option in existing Square D panel boards and busbar systems. When selecting protection, ensure the panel is rated for QO/QOB devices and that the circuit's fault current does not exceed the breaker’s 10 kA rating before use. The QOB320 is commonly listed under the model family as QOB320 across retailers and Schneider Electric catalogs, reflecting its role as the 3P, 20A, 240V option in the QO landscape. This ensures consistent performance across QO/Quad-LB panels and simplifies procurement for replacement breakers.