Square D QOB250 Miniature Circuit Breaker

No. The QOB250 features a bolt-on connection designed specifically for Square D NQ and NQOD panelboards. Standard residential QO load centers require plug-on circuit breakers, such as the QO250.

For the 8-2 AWG wire range supported by the box lugs, Square D specifies a tightening torque of 44.3 lb-in (5 N.m). Always verify against the label on the physical breaker, as torque requirements can occasionally vary by manufacturing date.

Yes, the QOB250 is HACR rated. It is certified for use with heating, air conditioning, and refrigeration equipment that requires this specific overcurrent protection designation.

Yes. In addition to its AC ratings, this breaker is rated for use in 48VDC systems and provides a 5kA interrupting capacity at that voltage.

Yes. If your application requires a fault current rating higher than the 10kAIC provided by the standard QOB250, the QOB250VH offers a 22kAIC rating at 120/240VAC.

Yes, this breaker features the Square D Visi-Trip indicator. When a fault causes the breaker to trip, a high-visibility red flag appears in a window on the face of the breaker, making it easy to quickly identify the tripped circuit in a crowded panelboard.

No. The QOB250 is designed with integrated terminal brackets that bolt directly onto the busbar of compatible NQ and NQOD panelboards. No additional mounting hardware is required.

No, the QOB250 is a standard thermal-magnetic circuit breaker and does not include ground fault circuit interruption (GFCI). If your installation requires 50A ground fault equipment protection in a bolt-on form factor, use the QOB250GFI instead.