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Square D QO340 - 3-Pole Circuit Breaker 40A 240V

Square D
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Square D QO340 is a molded case circuit breaker designed for providing reliable overcurrent protection in three-phase electrical systems. It features a 40A current rating and a 240V AC voltage rating, housed within a compact 3.0 in (76 mm) x 2.2 in (57 mm) x 2.9 in (74 mm) frame with a plug-in connection and lug terminals. The breaker is CSA Certified, HACR, and UL Listed, ensuring compliance with North American safety standards for use in commercial and light industrial applications such as panelboards and load centers.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic Protection, Standard Breaker Type
  • Voltage Rating: 240V AC
  • Current Rating: 40A
  • Dimensions: 3.0 in (76 mm) H x 2.2 in (57 mm) W x 2.9 in (74 mm) D
  • Weight: 0.8 lb
  • Standards: CSA Certified, HACR, UL Listed
  • Applications: QO Load Centers and NQ Panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Temp Rating: -25 to 70 °C (-13 to 158 °F)
  • Phase: 3
  • AIC Rating: 10kA @ 240V
  • Connection: Plug-In, Lug Terminal
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: Long Time and Instantaneous Trip
  • Frame Size: 100A/QO
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Standard
  • MCM Size: Accepts Wire Sizes 8 AWG to 2 AWG
  • Wire Size: AWG 8 to AWG 2, Copper or Aluminum
  • Certification: HACR, UL Listed


Product Identification
  • UPC: 785901400769
  • GTIN: 00785901400769