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Square D QO345 - 3-Pole Circuit Breaker (45A, 240V)

Square D
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Square D QO345 is a molded case circuit breaker designed for providing reliable overcurrent protection in three-phase electrical systems. It features a 45A current rating and a 240V AC voltage rating, housed within a compact 79 mm x 57 mm x 74 mm (HxWxD) frame with a plug-in connection and lug terminals. This thermal-magnetic breaker offers both long-time and instantaneous trip functions, is CSA certified and UL listed, and operates effectively in temperatures from -25°C to 70°C. It is engineered for use in QO load centers and NQ panelboards, providing 10kA interrupting capacity for robust branch circuit protection.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic Protection, Standard Breaker
  • Voltage Rating: 240V AC
  • Current Rating: 45A
  • Dimensions: 79 mm H x 57 mm W x 74 mm D (3.1 in x 2.2 in x 2.9 in)
  • Standards: CSA Certified, HACR, UL Listed
  • Applications: QO Load Centers, NQ Panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Temp Rating: -25°C to 70°C (-13°F 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
  • Trip Type: Thermal Magnetic
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Standard
  • MCM Size: 8 AWG to 2 AWG
  • Wire Size: AWG 8 to AWG 2, Copper or Aluminum
  • Certification: HACR, UL Listed
  • Weight: 0.83 lb


Product Identification
  • UPC: 785901012481
  • GTIN: 00785901012481