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Square D QOB3901021 - 90A 3-Pole Bolt-On Circuit Breaker

Square D
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Square D QOB3901021 is a molded case circuit breaker designed for providing reliable overcurrent and short-circuit protection in three-phase electrical systems. It features a 90A current rating and a 120/240VAC voltage rating, housed within a compact 3.5 in (89 mm) x 3.0 in (76 mm) x 2.9 in (74 mm) frame constructed for bolt-on connection to Square D NQOD panelboards. This unit is CSA and UL Listed, ensuring compliance with industry safety standards for thermal-magnetic protection with long-time and instantaneous trip functions, making it suitable for commercial and light industrial power distribution applications.

Key Features & Specifications
  • Type: Molded Case, Shunt Trip, Thermal Magnetic Protection
  • Voltage Rating: 120/240VAC
  • Current Rating: 90A
  • Frame Size: 100A/QO
  • AIC Rating: 10kA @ 240V
  • Poles: 3
  • Connection: Bolt-On
  • Terminal Connection: Pressure Plate
  • Wire Size: AWG 4 to AWG 2/0, Copper/Aluminum
  • Dimensions: 3.5 in (89 mm) H x 3.0 in (76 mm) W x 2.9 in (74 mm) D
  • Weight: 1.36 lb
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Standards: CSA, UL Listed
  • Phase: 3
  • Panel Type: Square D NQOD Panelboards
  • Functions: Long-Time and Instantaneous Trip


Product Identification
  • UPC: 785901031055
  • GTIN: 00785901031055