Schneider Electric QO240 Plug-In Circuit Breaker

Schneider Electric QO240 Plug-In Circuit Breaker is a 2‑pole miniature circuit breaker in the Square D QO family, rated for 40 amperes on 120/240‑V AC circuits. This plug‑in device is designed for use in QO load centers and panelboards to protect downstream conductors from overloads and short circuits, with a thermal‑magnetic trip that interrupts the circuit when overcurrent occurs. It delivers up to 10,000 A of interrupting capacity (10 kA) at 240 V, making it suitable for typical residential and light commercial loads. The QO240 is a two‑pole unit that occupies two panel spaces in compatible QO enclosures and works with standard QO bus systems. Applications include protection for 240‑V circuits such as certain appliances, motors, and other branch circuits in homes and small businesses where 120/240‑V service is present.