Square D QO2100 Miniature Circuit Breaker

No. The QO2100 is a 3/4-inch format plug-on breaker exclusively for Square D QO load centers and NQ panelboards. It will not fit Homeline load centers, which require a 1-inch format breaker.

This 2-pole circuit breaker requires two adjacent 3/4-inch spaces, taking up 1.5 inches of total width on the panel bus bar.

Functionally, there is no difference. Both catalog numbers represent the same 100A 2-pole QO circuit breaker. The "CP" suffix simply indicates commercial or contractor packaging.

No. The QO2100 is a standard branch-style plug-on circuit breaker. It is not interchangeable with QOM1 or QOM2 dedicated main breakers, which have a completely different physical footprint and bolting mechanism.

Yes, it can be used as a back-fed main breaker in compatible QO load centers, provided it is installed with the appropriate Square D main breaker retaining kit as required by the National Electrical Code.

Yes. While the QO2100 box lugs are dual-rated for both copper and aluminum wire, standard electrical safety practices require applying an approved antioxidant joint compound when terminating aluminum conductors to prevent oxidation and ensure a secure connection.

Yes, in addition to its standard AC ratings, the QO2100 is also rated for use in 48VDC circuits.

Yes, the QO2100 is compatible with modern QO load centers and NQ panelboards, as well as older OEM interiors and Speed-D switchboard distribution panels designed for QO plug-on breakers.

The QO2100 is HACR rated, meaning it is approved by testing laboratories for use with compatible Heating, Air Conditioning, and Refrigeration equipment that requires this specific designation for overcurrent protection.