Square D QO240 Circuit Breaker 40A 2-Pole QO Series

This listing is for a Square D QO240 2-Pole 40A Thermal-Magnetic Circuit Breaker, designed for reliable overcurrent protection in both residential and commercial electrical panels. The QO-series breakers are known for their high performance, durability, and quick-open (“Qwik-Open”) trip mechanism, ensuring fast response to overloads and short circuits.
This unit has been visually inspected, shows normal signs of previous use, and is ideal as a replacement breaker or for expanding existing Square D QO load centers.
Key Features
✔ Square D QO240 – Genuine OEM breaker
✔ 40 Amp, 2-Pole – Supports 240V circuits
✔ Thermal-Magnetic Trip Mechanism – Fast response to overloads
✔ QO Series “Qwik-Open” design – Industry-leading performance
✔ Breakers Made in USA
✔ Used / Pre-Owned – Fully functional
✔ Ideal for residential, industrial, or commercial use
Specifications
✔ Brand: Square D / Schneider Electric

✔ Series: QO (Qwik-Open)

✔ Model: QO240

✔ Type: Thermal-Magnetic Circuit Breaker

✔ Amperage Rating: 40A

✔ Poles: 2-Pole

✔ Voltage Rating: 120/240 VAC

✔ Interrupt Rating: 10 kAIC (typical for QO series)

✔ Mounting Style: Plug-On (QO Load Centers)

✔ Wire Compatibility: Copper/Aluminum – 75°C rated conductors

✔ Frequency: 50/60 Hz

✔ Trip Type: Thermal-Magnetic

✔ Country of Manufacture: USA

✔ Condition: Used / Pre-Owned – Fully functional

Weight: 5 lbs
Dimensions: 6 × 4 × 2 in