Square D QO380 Miniature Circuit Breaker

Because it utilizes the standard QO 3/4-inch pole format, this 3-pole breaker requires three full spaces (2.25 inches total width) in a compatible load center or panelboard.

No. Square D QO and Homeline breakers are not interchangeable. QO breakers utilize a 3/4-inch footprint and clip onto different bus bar configurations, whereas Homeline breakers use a 1-inch footprint.

The factory-installed box lugs accept #4 AWG to 2/0 AWG copper or aluminum wire. Always refer to the breaker labeling for precise torque requirements, which vary depending on the exact wire gauge and material used.

Yes. It is manufactured with an internal common trip mechanism, ensuring that an overload or short circuit on any single pole will immediately open all three poles to safely disconnect the entire 3-phase circuit.

Yes. The QO380 features Square D's Visi-Trip technology. When the breaker trips, a highly visible red indicator appears in the breaker window to help quickly identify the tripped circuit in a fully populated panel.

Yes. This breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires HACR-certified branch circuit protection.

Yes, if your panelboard requires bolt-on branch breakers rather than plug-on, you will need the QOB380 catalog number instead.

Yes, if your system requires a 22kAIC fault current rating, you will need the QO380VH catalog number. It shares the same physical footprint but offers higher short-circuit protection.