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Square D QO370 - 3-Pole Circuit Breaker 70A 240V

Square D
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Square D QO370 is a molded case circuit breaker designed for providing reliable overcurrent protection in three-phase electrical systems. It features a 70A current rating and a 240V AC voltage rating, housed within a compact, plug-in design measuring 79 mm H x 57 mm W x 74 mm D and weighing 1.08 lb. The breaker utilizes a thermal-magnetic trip mechanism for both long-time and instantaneous protection, is CSA certified and UL listed, and is engineered for use in QO load centers and NQ panelboards for commercial and light industrial applications.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic, Standard
  • Voltage Rating: 240V AC
  • Current Rating: 70A
  • Dimensions: 3.1 in H (79 mm) x 2.2 in W (57 mm) x 2.9 in D (74 mm)
  • Standards: CSA Certified, HACR, UL Listed
  • Applications: Commercial and Light Industrial 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
  • Trip Type: Thermal Magnetic
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Standard
  • MCM Size: Accepts #8 AWG to #2 AWG Wire
  • Wire Size: #8 AWG to #2 AWG, Copper or Aluminum
  • Certification: HACR, UL Listed
  • Mounting: Plug-In
  • Terminal Connection: Lug
  • Standards: CSA, UL
  • Compatible Frames: QO Series
  • Country of Origin: Mexico
  • Family: QO Series


Product Identification
  • UPC: 785901004387
  • GTIN: 00785901004387