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Square D QOB340 - 3-Pole 40A Circuit Breaker (10kA AIC)

Square D
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Square D QOB340 is a molded case circuit breaker designed for providing reliable overcurrent protection in three-phase electrical systems. It features a 40A current rating and a 120/240VAC voltage rating, housed within a compact 100A/QO frame measuring 79 mm H x 57 mm W x 74 mm D and weighing 0.8 lb. The breaker utilizes a thermal-magnetic trip mechanism for both long-time and instantaneous protection, is CSA and UL Listed, and is constructed for bolt-on connection to Square D NQOD panelboards with pressure plate terminals accepting #8 to #2 AWG copper or aluminum wire. It is engineered for industrial and commercial applications requiring a 10kA interrupting capacity at 240V in environments from -25°C to 70°C.

Key Features & Specifications
  • Type: Molded Case, Standard, Thermal Magnetic Protection
  • Voltage Rating: 120/240VAC
  • Current Rating: 40A
  • Frame Size: 100A/QO
  • Poles: 3
  • Phase: 3
  • AIC Rating: 10kA @ 240V
  • Connection: Bolt-On
  • Terminal Connection: Pressure Plate
  • Wire Size: #8 to #2 AWG (Copper or Aluminum)
  • Dimensions: 3.1 in H (79 mm) x 2.2 in W (57 mm) x 2.9 in D (74 mm)
  • Weight: 0.8 lb
  • Standards: CSA, UL Listed
  • Certification: UL Listed
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Panel Type: Square D NQOD Panelboards
  • Functions: Long Time and Instantaneous Trip
  • Breaker Type: Standard
  • Protection: Thermal Magnetic
  • Family: QOB Series
  • Country of Origin: Mexico


Product Identification
  • UPC: 785901417149
  • GTIN: 00785901417149