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Square D QO240EPD - 2-Pole 40A Circuit Breaker (10kA AIC)

Square D
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Square D QO240EPD is a two-pole molded case circuit breaker designed to provide reliable overcurrent protection for residential and light commercial electrical systems. It features a 40A current rating and a 120/240V AC voltage rating, housed in a compact plug-in unit measuring 105 mm H x 38 mm W x 74 mm D and weighing 1.06 lb. The breaker utilizes a thermal-magnetic trip mechanism with long-time and instantaneous (LI) functions, offers a 10kA interrupting capacity at 240V, and is certified to UL and CSA standards for safe operation in temperatures from -25°C to 70°C. Its design supports wiring with copper conductors from AWG 14 to 6 and aluminum conductors from AWG 12 to 4, making it suitable for feeder and branch circuit protection in load centers and panelboards.

Key Features & Specifications
  • Type: QO Series, Two-Pole, Molded Case, Thermal-Magnetic Protection with LI (Long-time & Instantaneous) Trip
  • Voltage Rating: 120/240V AC; 120V AC
  • Current Rating: 40A
  • Dimensions: 4.1 in H (105 mm) x 1.5 in W (38 mm) x 2.9 in D (74 mm)
  • Standards: UL Listed, CSA Certified
  • Applications: Feeder and branch circuit protection in residential and light commercial load centers
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Phase: 1
  • AIC Rating: 10kA @ 240V
  • Connection: Plug-In
  • Poles: 2
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous Trip
  • Wire Size: AWG 14 to 6 (Copper); AWG 12 to 4 (Aluminum)
  • Certification: UL Listed; CSA


Product Identification
  • UPC: 078590174212
  • GTIN: 00785901742128