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Square D QOB3501021 - 3-Pole 50A Shunt Trip Circuit Breaker

Square D
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Square D QOB3501021 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 120/240VAC voltage rating, housed within a compact 79mm x 76mm x 74mm (HxWxD) bolt-on unit weighing 1.18 lb. This thermal-magnetic shunt trip breaker is CSA and UL Listed, ensuring compliance with industry safety standards for use in Square D NQOD panelboards and similar industrial applications.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic Protection, Shunt Trip
  • Voltage Rating: 120/240VAC
  • Current Rating: 50A
  • Dimensions: 3.1 in (79 mm) H x 3.0 in (76 mm) W x 2.9 in (74 mm) D
  • Standards: CSA, UL Listed
  • Applications: Industrial panelboard protection
  • Switch Type: Circuit Breaker
  • Configuration: Bolt-On
  • Temp Rating: 40°C (104°F) Maximum Ambient
  • Phase: 3
  • AIC Rating: 10kA @ 240V
  • Connection: Bolt-On
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous (LI)
  • Frame Size: 100A/QO
  • Trip Type: Thermal Magnetic
  • Panel Type: Square D NQOD Panelboards
  • Breaker Type: Shunt Trip
  • MCM Size: 2 AWG Max, 4 AWG Min
  • Wire Size: 8 to 2 AWG (Aluminum/Copper)
  • Certification: UL Listed
  • Terminal Connection: Pressure Plate
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-Phase
  • Compatible Frames: QO Series
  • Installation Type: Panel Mount
  • Breaker Frame: QOB
  • Operating Temperature: -40°C to 40°C


Product Identification
  • UPC: 785901494447
  • GTIN: 00785901494447