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Square D QO140 - 40A Circuit Breaker (10kA AIC, 1-Pole)

Square D
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Square D QO140 is a single-pole, plug-in molded case circuit breaker designed to provide reliable overcurrent protection for 120/240V AC branch circuits. It features a 40A current rating and a 10kA interrupting capacity at 240V, utilizing a thermal-magnetic trip mechanism for both long-time and instantaneous protection. The compact unit measures 79 mm x 19 mm x 74 mm (H x W x D), weighs 0.538 lb, and is constructed with lug terminals compatible with copper or aluminum conductors from 8 AWG to 2 AWG. It is CSA Certified, UL Listed, and HACR approved for use in heating, air conditioning, and refrigeration equipment, making it suitable for installation in QO load centers and NQ panelboards within an operating temperature range of -25 to 70 °C.

Key Features & Specifications
  • Type: Standard, Thermal Magnetic, Molded Case Circuit Breaker
  • Voltage Rating: 120/240V AC
  • Current Rating: 40A
  • Dimensions: 3.1 in (79 mm) x 0.7 in (19 mm) x 2.9 in (74 mm) (H x W x D)
  • Standards: CSA Certified, HACR, UL Listed
  • Applications: Branch circuit protection in QO Load Centers and NQ Panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Temp Rating: -25 to 70 °C (-13 to 158 °F)
  • Phase: 1
  • AIC Rating: 10kA @ 240V
  • Connection: Plug-In
  • Poles: 1
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous Trip (LI)
  • Frame Size: 100A/QO
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Standard
  • MCM Size: Min. Wire Size 8 AWG, Max. Wire Size 2 AWG
  • Terminal Connection: Lug
  • Wire Size: AWG 8 to AWG 2, Copper/Aluminum
  • Certification: HACR, UL Listed


Product Identification
  • UPC: 785901400189
  • GTIN: 00785901400189