Square D QO2150 Miniature Circuit Breaker

Due to its high amperage rating and reinforced frame, this circuit breaker requires four standard 3/4-inch pole spaces in your load center or panelboard.

No. When used in NQ panelboards, this breaker is strictly limited to single-phase interiors. Installing the QO2150 into a three-phase interior is prohibited because it will bridge the buses and create a phase-to-phase short circuit.

The integrated mechanical box lugs must be torqued to 250 lb-in (28.3 N.m) when terminating your 1 AWG to 300 kcmil copper or aluminum conductors.

Yes, the QO2150 is frequently used as a main breaker in subpanels. However, when back-feeding this plug-on breaker, the National Electrical Code requires the use of a factory-approved hold-down retaining kit to secure it physically to the panel interior.

No. Although both are manufactured by Schneider Electric, the QO and Homeline series use completely different busbar architectures. This breaker will only seat onto the busbars of compatible QO load centers, NQ panelboards, and NQOD panelboards.

The standard QO2150 has a short-circuit interrupting rating of 10kAIC at 120/240VAC. The QO2150VH is the high-interrupting variant, rated for 22kAIC. You must verify your facility's available fault current to select the correct model.

This model features Square D Visi-Trip technology. When the breaker trips, the handle moves to a center position and a bright red flag appears in the indicator window, allowing for quick identification of the faulted circuit without guessing.