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Square D QOB340EPD - 3-Pole 40A Thermal Magnetic Breaker

Square D
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The Square D QOB340EPD is a 3-pole molded case circuit breaker from the QOB Series, designed to provide thermal-magnetic protection for branch circuits. It is rated for 40A at 120V AC with a 10kA interrupting capacity, supporting 3-phase systems and accommodating wire sizes from AWG 14 to AWG 6 copper or AWG 12 to AWG 4 aluminum. The unit measures 4.1 in (105 mm) in height, 2.2 in (57 mm) in width, and 2.9 in (74 mm) in depth, weighing 1.33 lb, and features a plug-in connection for QO load centers. It offers LI (Long Time and Instantaneous) protection functions and operates within a temperature range of -13°F to 158°F (-25°C to 70°C). This breaker is suitable for industrial applications requiring reliable overcurrent protection in commercial and light industrial power distribution systems.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic
  • Voltage Rating: 120V AC
  • Current Rating: 40A
  • Dimensions: 4.1 in (105 mm) x 2.2 in (57 mm) x 2.9 in (74 mm) (Height x Width x Depth)
  • Standards: UL Listed
  • Applications: Industrial branch circuit protection
  • Poles: 3
  • Connection: Plug-In
  • Protection: Thermal Magnetic
  • Functions: LI - Long Time and Instantaneous
  • AIC rating: 10kA@120V
  • Phase: 3
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Wire Size: AWG 12 to AWG 4 Aluminum, AWG 14 to AWG 6 Copper
  • Weight: 1.33 lb
  • Family: QOB Series
  • Type: QOB
  • Item Subcategory: Molded Case
  • Manufacturer: Schneider Electric


Product Identification
  • UPC: Not provided
  • GTIN: Not provided