Schneider Electric QO320 Circuit Breaker

The QO320 is a 3-pole, 20-amp miniature circuit breaker from Square D’s QO lineage (Schneider Electric), designed for 120/240 VAC plug‑in panelboards. It features a 10 kA interrupt rating, providing reliable fault protection for 120/240 V branch circuits in residential and light commercial panels. This 3-pole design protects three conductors within compatible QO panelboards, and it’s a plug-in breaker that installs in standard QO enclosures for straightforward replacement and serviceability. Suitable for 120/240 VAC operation, the QO320 is used to protect 240 V circuits in panels that accept QO breakers, aligning with common configurations in compatible electrical systems.