Siemens Q22040CT Circuit Breaker

Siemens Q22040CT is a QT-series three-pole molded‑case circuit breaker designed for 120/240 V residential and light‑commercial panels, rated for 20–40 A with a 10 kA interrupt rating at 240 V. This plug‑in device provides three‑pole protection in a compact, Siemens‑compatible form factor, enabling efficient space use in load centers that accept QT breakers. Its thermal‑magnetic trip mechanism delivers reliable overcurrent protection, coordinating with feeders and branch circuits to shut down on overloads or short circuits while preserving downstream equipment. The Q22040CT is built for use in compatible Siemens load centers and is commonly selected to protect multiple branch circuits within a single module, such as lighting and receptacle runs or dedicated loads in the 20–40 A range. With its Siemens lineage and QT‑series design, it pairs with other QT breakers to simplify panel layouts while maintaining clear marking and interchangeability within the Siemens protection ecosystem.