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Square D QOB350 - 3-Pole Molded Case Breaker (50A, 10kA AIC)

Square D
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Square D QOB350 is a molded case circuit breaker designed for providing reliable overcurrent and short-circuit protection in three-phase electrical systems. It features a 50A current rating and a voltage rating of 120/240VAC, housed within a compact, bolt-on unit measuring 79 mm H x 57 mm W x 74 mm D and weighing 0.85 lb. The breaker utilizes a thermal-magnetic trip mechanism for both long-time and instantaneous protection, is constructed for an operating temperature range of -25°C to 70°C, and complies with UL and CSA standards. It is typically applied in industrial and commercial settings within Square D NQOD panelboards, supporting wire sizes from 8 AWG to 2 AWG with a 10kA interrupting capacity at 240V.

Key Features & Specifications
  • Type: Molded Case, Standard, Thermal-Magnetic Protection
  • Voltage Rating: 120/240VAC
  • Current Rating: 50A
  • Dimensions: 3.1 in H (79 mm) x 2.2 in W (57 mm) x 2.9 in D (74 mm)
  • Standards: CSA, UL Listed
  • Applications: Industrial/Commercial Panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Bolt-On
  • Temp Rating: -25°C to 70°C
  • Phase: 3
  • AIC Rating: 10kA @ 240V
  • Connection: Bolt-On
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: Long Time and Instantaneous Trip
  • Frame Size: 100A/QO
  • Panel Type: Square D NQOD Panelboards
  • Breaker Type: Standard
  • MCM Size: 8 AWG to 2 AWG
  • Terminal Connection: Pressure Plate
  • Wire Size: AWG 8 to AWG 2, Copper or Aluminum
  • Certification: UL Listed


Product Identification
  • UPC: 785901417163
  • GTIN: 00785901417163