Square D QOT1520 15/20A Tandem Miniature Circuit Breaker

The QOT1520 is a Class CTL tandem breaker equipped with a mounting cam that restricts installation to panel slots specifically designed for tandems. The QO1520 is a non-CTL version without this rejection feature, generally reserved for older, pre-1968 panels that lack CTL provisions.

No. QO and QOT series breakers use a 3/4-inch format and a different bus connection. They are not interchangeable with Homeline load centers. This breaker is exclusively for Square D QO Class CTL panels.

No. Because both the 15A and 20A poles connect to the same bus stab, they are on the same phase and only provide independent 120V circuits. They cannot provide 240V across the two poles and must not be used for shared-neutral multi-wire branch circuits.

The QOT1520 features a physical mounting cam, or rejection hook, molded into the breaker casing. This hook physically blocks the breaker from seating onto the bus bar if you attempt to install it in a standard, non-tandem slot, ensuring the panel remains within its UL-listed circuit capacity.

Yes. If either the 15A or 20A circuit trips, the respective handle moves to a center position and displays a bright red flag. This allows for rapid identification of the tripped circuit inside a crowded load center.

Yes, this breaker is UL Listed as HACR type, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires HACR-marked circuit breakers.