Square D QOU2100 Miniature Circuit Breaker

No. The QOU2100 is a unit-mount circuit breaker engineered for OEM control panels, DIN rail systems, and standalone enclosures. It does not have the plug-on or bus-mounting connections required for standard residential and commercial QO or Homeline load centers.

While classified generally as a unit-mount breaker, it is highly versatile. It can be snapped directly onto standard 35mm symmetrical DIN rails, or it can be flush-mounted or surface-mounted directly to a backpan using its built-in mounting feet.

Yes. QOU circuit breakers are fully rated for reverse-feed applications. They also feature field-reversible line and load lugs to accommodate different wire routing needs when surface or flush mounting.

The QOU2100B is the exact same 100A, 2-pole circuit breaker. The B suffix simply indicates that the product is shipped in bulk packaging rather than individual boxes, which is commonly requested by OEMs and high-volume panel builders.

Yes, the QOU2100 carries an HACR rating, meaning it is safely approved for group motor protection in heating, air conditioning, and refrigeration systems.

Yes. It features the Square D Visi-Trip window. When the breaker trips during an overcurrent or short-circuit event, a high-visibility red indicator drops into the window, allowing electricians to quickly locate the faulted circuit.

Yes, the QOU breaker frame accepts various field-installable electrical accessories, including shunt trips, auxiliary contacts, and alarm switches. Note that attaching these accessories will require additional horizontal pole space in your panel or enclosure.