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Square D QOB2401021 - 2-Pole 40A Circuit Breaker (10kA AIC)

Square D
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Square D QOB2401021 is a molded case circuit breaker designed for providing reliable overcurrent protection in single-phase electrical systems. It features a 40A current rating and a 120/240VAC voltage rating, with a compact physical footprint of 79 mm H x 57 mm W x 74 mm D and a bolt-on connection for secure installation. This thermal-magnetic breaker, compliant with CSA and UL standards, utilizes a long-time and instantaneous (LI) trip function and a 10kA interrupting rating at 120V for effective fault protection. Its construction supports copper or aluminum wiring from AWG 8 to 2 via pressure plate terminals and is engineered for operation in temperatures from -25°C to 70°C, making it suitable for use in Square D NQOD panelboards across commercial and light industrial applications.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Shunt Trip, Thermal Magnetic Protection
  • Voltage Rating: 120/240V AC
  • Current Rating: 40A
  • Frame Size: 100A/QO
  • Poles: 2
  • Phase: 1
  • AIC Rating: 10kA @ 120V
  • Connection: Bolt-On
  • Terminal Connection: Pressure Plate
  • Wire Size: AWG 8 to AWG 2 (Copper/Aluminum)
  • MCM Size: Min. 8 AWG, Max. 2 AWG
  • Functions: LI (Long-Time and Instantaneous Trip)
  • Protection: Thermal Magnetic
  • Panel Type: Square D NQOD Panelboards
  • Standards: CSA, UL Listed
  • Certification: UL Listed
  • Dimensions: 3.1 in (79 mm) H x 2.2 in (57 mm) W x 2.9 in (74 mm) D
  • Weight: 0.96 lb
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Family: QOB Series
  • Country of Origin: Mexico


Product Identification
  • UPC: 785901494324
  • GTIN: 00785901494324