Square D QO120 Miniature Circuit Breaker

It is designed exclusively for Square D QO Load Centers, NQ Panelboards, and Speed-D Switchboards. It is not interchangeable with Square D Homeline (HOM) panels, as QO breakers utilize a 3/4-inch width format while Homeline breakers are 1-inch wide.

The breakers are functionally identical. The CP suffix indicates commercial consumer packaging (blister pack) meant for retail display, while the standard QO120 is packaged for bulk distributor sales.

Both breakers share the same physical size and fit QO panels, but the QO120 has a 10kA interrupting rating compared to the 22kA rating of the QO120VH. Replacing a VH model with a standard QO120 downgrades your short-circuit protection and is only code-compliant if the calculated available fault current is verified to be under 10kA.

Yes, it is HACR rated for use with heating, air conditioning, and refrigeration equipment. It is also SWD (Switching Duty) rated, meaning it can be used to safely switch 120VAC fluorescent lighting loads.

Yes, it includes the Square D Visi-Trip indicator. When the breaker trips due to an overload or short circuit, the handle snaps to a center position and a high-visibility red flag appears in the indicator window, allowing quick identification of the faulted circuit.

Yes, the pressure plate terminals are rated for both copper and aluminum conductors ranging from 14 AWG to 8 AWG. When using aluminum wire, ensure you follow standard termination practices such as applying an approved oxide inhibitor.

While primarily used for 120/240VAC branch circuits, the QO120 is also UL rated for 48VDC with a 5kA interrupting capacity. This makes it suitable for protecting certain low-voltage DC control circuits.