Square D QO235 Miniature Circuit Breaker

No. The QO235 is designed exclusively for Square D QO load centers, NQ panelboards, NQOD panelboards, and Speed-D switchboards. It is not compatible with Homeline (HOM) load centers, which utilize a different busbar design.

The QO235 is a standard-width, 2-pole miniature circuit breaker. It requires two adjacent 3/4-inch spaces to mount onto a compatible QO or NQ panel bus.

The box lugs on this 35A breaker require a tightening torque of 44.3 lb-in (5 N.m) when securing the supported 8 to 2 AWG copper or aluminum conductors. Always refer to the breaker label to confirm torque values prior to installation.

Yes. The QO235 carries a Heating, Air Conditioning, and Refrigeration (HACR) certification. This makes it an appropriate choice for protecting dedicated HVAC circuits, such as air compressors and heat pumps, that require a 35A overcurrent device.

Yes, it can be used as a back-fed main breaker in compatible panels. However, electrical codes require back-fed plug-on breakers to be physically secured to the panel busbar. You must install a Square D PK2MB retaining bracket kit to safely lock the breaker in place.

Yes. While predominantly used for 120/240VAC systems, the QO235 is also rated for up to 48VDC with a 5kA interrupting capacity. This allows it to be used in low-voltage DC control panels or battery backup applications.

You can only alter breaker amperage if the existing circuit conductors are properly sized for the new rating. Upgrading to a 35A breaker typically requires at least 8 AWG wire. Consult a licensed electrician and local codes before changing a circuit's overcurrent protection.

The Square D QO235 features a Visi-Trip indicator, which displays a highly visible red flag in the breaker window when it has tripped due to an overload or short circuit. This allows electricians to quickly identify a faulted circuit inside a crowded panel without testing every breaker.