Square D QO330 3-Pole Plug-In Circuit Breaker

The Square D QO330 is a 3-pole, 30-amp, 240-volt plug-in miniature circuit breaker designed for use in Square D QO load centers. It uses a thermal-magnetic trip with common-trip across all three poles and mounts in a plug-in chassis for quick replacement in compatible panels, occupying a 3-space footprint. The breaker accepts aluminum or copper conductors from 14 AWG to 8 AWG and is rated for 240 VAC at 50/60 Hz, with a 10 kA interrupt rating (10,000 A) at 240 V. This QO330 unit is compatible with QO load centers and, in many installations, can also be used in certain NQ panelboards. It protects 30 A circuits feeding 240 V branch loads in residential or light commercial wiring, providing reliable overcurrent protection for equipment such as air handlers, water heaters, or other high-current 240 V devices.