Schneider Electric QO240 Plug-In Circuit Breaker

Schneider Electric's QO240 is a 40-amp, two-pole miniature circuit breaker from the Square D QO family, designed for 120/240-volt AC circuits with plug-in mounting in compatible QO load centers and panelboards. It delivers thermal-magnetic overcurrent protection with a 10 kA interrupt rating at 240V, ensuring rapid response to overloads and short circuits in residential or light commercial distribution. With two poles, it simultaneously protects both conductors of a 240V circuit and fits the standard QO footprint for straightforward swapping in existing panels. The plug-in design supports fast replacement and maintenance, reducing downtime when a circuit trips or requires replacement. Common applications include feeders and branch circuits for large appliances and 240V loads in homes and small offices that require a 40A protection level.