Square D QO1515 15/15A Tandem Miniature Circuit Breaker

The QO1515 is a non-CTL tandem breaker without a mounting hook. It is intended for use in older QO panels that lack circuit total limitation rules. The QOT1515 is a CTL breaker featuring a rejection hook that limits installation to specific slotted bus stabs in modern panels.

Non-CTL stands for non-Circuit Total Limitation. This breaker does not have a physical rejection clip, meaning it can slide onto any bus stab. These tandems are strictly intended for use as replacement parts in older load centers that do not restrict the total number of circuits.

No. This breaker is specifically designed for Square D QO load centers. QO and Homeline series breakers utilize different busbar connections and cannot be interchanged. You must use HOM series breakers for Homeline panels.

No. As a tandem breaker, it provides two separate 15-amp circuits while taking up only one standard 3/4-inch space in the panel. This allows panel builders to add circuits when a load center is near physical capacity.

When the breaker experiences an overload or short circuit, the handle moves to a center position and reveals a bright red visual flag. This allows you to quickly locate the tripped circuit in a dark or crowded electrical panel.

No. The two toggles operate independently. If a fault occurs on one of the 15-amp circuits, only that specific toggle will trip. The second circuit will remain energized.

No. Both circuits in this tandem unit connect to the same phase leg of the panel busbar. Because it only supplies 120 volts to each load, it cannot be used for 240-volt appliances that require a standard two-pole breaker spanning two phases.

In the context of miniature circuit breakers, the terms tandem, twin, and duplex are used interchangeably. They all refer to a breaker like the QO1515 that provides two independent single-pole circuits in a single panel space.