QOB320 is Square D's three-pole bolt-on mini circuit breaker for 240 V systems, rated 20 A to protect three-phase branch circuits in compatible QOB/QO panelboards. It has a 10 kA interrupt rating at 240 V and is ANSI-certified and UL-listed for standard electrical protection. The unit uses thermal-magnetic protection and mounts bolt-on in compatible Square D panels, providing a compact, quick-install solution for three-phase circuits. Compatible with Square D QO panelboards/load centers that accept QOB-series breakers.
