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Square D QO350 - 3-Pole Circuit Breaker 50A 240V

Square D
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Square D QO350 is a molded case circuit breaker designed for providing reliable overcurrent protection in three-phase electrical systems. It features a 50A current rating and a 240V AC voltage rating, housed within a compact 100A frame with dimensions of 79 mm H x 57 mm W x 74 mm D and a weight of 0.83 lb. The breaker utilizes a thermal-magnetic trip mechanism for both long-time and instantaneous protection, is constructed for plug-in connection with lug terminals, and operates within a temperature range of -25 to 70 °C. It complies with key industry standards including UL Listing and CSA certification, with a 10kA interrupting rating at 240V AC. This unit is typically applied in commercial and light industrial settings within compatible QO load centers and NQ panelboards, accommodating copper or aluminum conductors from 8 AWG to 2 AWG.

Key Features & Specifications
  • Type: Molded Case, Standard, Thermal-Magnetic Protection
  • Voltage Rating: 240V AC
  • Current Rating: 50A
  • Frame Size: 100A/QO
  • AIC Rating: 10kA @ 240V AC
  • Phase: 3
  • Poles: 3
  • Connection: Plug-In
  • Terminal Connection: Lug
  • Wire Size: 8 AWG to 2 AWG (Copper or Aluminum)
  • Dimensions: 79 mm H x 57 mm W x 74 mm D (3.1 in x 2.2 in x 2.9 in)
  • Weight: 0.83 lb
  • Operating Temperature: -25°C to 70°C (-13°F to 158°F)
  • Standards & Certification: UL Listed, CSA Certified, HACR
  • Panel Type: QO Load Centers, NQ Panelboards
  • Functions: Long Time and Instantaneous Trip
  • Breaker Type: Standard
  • Protection: Thermal Magnetic


Product Identification
  • UPC: 785901400806
  • GTIN: 00785901400806