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Square D QO240 - 2-Pole 40A Circuit Breaker (10kA AIC)

Square D
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Square D QO240 is a molded case circuit breaker designed for providing reliable overcurrent protection in residential and light commercial electrical systems. It features a 40A current rating and a 120/240V voltage rating, housed within a compact plug-in unit measuring 3.1 in (79 mm) H x 1.5 in (38 mm) W x 2.9 in (74 mm) D and weighing 0.57 lb. This thermal-magnetic breaker is CSA Certified, HACR, and UL Listed, ensuring compliance with industry safety standards for use in QO load centers and NQ panelboards.

Key Features & Specifications
  • Type: Standard, 2-pole, thermal-magnetic molded case circuit breaker with plug-in connection and lug terminals
  • Voltage Rating: 120/240V AC
  • Current Rating: 40A
  • Frame Size: 100A/QO
  • AIC Rating: 10kA @ 240V
  • Phase: 1
  • Protection Functions: LI (Long-Time and Instantaneous Trip)
  • Wire Size Compatibility: AWG 8 to AWG 2, Copper/Aluminum; MCM Size: 1/0 AWG to 300 MCM
  • Operating Temperature: -13 to 158 °F (-25 to 70 °C)
  • Standards & Certification: CSA Certified, HACR, UL Listed
  • Panel Type: Compatible with QO Load Centers and NQ Panelboards


Product Identification
  • UPC: 785901400486
  • GTIN: 78590140048600