Square D QO360 Three Phase Plug On Circuit Breaker

The Square D QO360 is a 60-amp, three-pole miniature circuit breaker in the QO family designed for 120/240 V AC three-phase service, with a 10 kA at 240 V interrupt rating and a plug-in mounting style that fits standard QO load centers. This device uses box-lug terminals and supports conductors from 8 AWG to 2 AWG copper or aluminum, enabling robust field connections for medium-size commercial or industrial circuits, and it uses thermal-magnetic tripping with common trip across all three poles to protect against overloads and short circuits. The physical footprint aligns with the QO frame, measuring roughly 3 inches high by 2.25 inches wide by 2.91 inches deep, and it is rated for environments up to 40°C ambient, making it suitable for typical indoor use in panels and switchboards. Applications include protection of three-phase feeders, motors, and control circuits in commercial or light industrial installations where a 60 A, 3P 240 V breaker is required.