Square D EJB34040SA - Molded Case Circuit Breaker 40A 3-Pole
Square D EJB34040SA - Molded Case Circuit Breaker 40A 3-Pole

Square D EJB34040SA - Molded Case Circuit Breaker 40A 3-Pole

Square D
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Square D EJB34040SA is a bolt-on molded case circuit breaker with a factory-installed shunt trip, designed for remote tripping and emergency power-off control in commercial and industrial power distribution systems. It is rated for 40 A at 480Y/277 V AC with a 65 kA interrupting capacity at 480V, providing thermal-magnetic protection for overloads and short circuits across three poles. The breaker measures 5.66 in x 3.92 in x 4.05 in (143.76 mm x 99.57 mm x 102.87 mm) and weighs 4.34 lb, featuring bolt-on mounting for NF and NQ panelboards and accepting wire sizes from AWG 12 to AWG 2/0 for aluminum and AWG 14 to AWG 2/0 for copper. It is UL 489 Listed and CSA Certified, ensuring compliance with North American safety standards. Typical applications include control panels, power distribution, and automated power control systems requiring remote disconnect capabilities.

Key Features & Specifications
  • Type: Bolt-On Thermal-Magnetic Circuit Breaker with Shunt Trip
  • Manufacturer: Schneider Electric (Square D)
  • Family: EJB Series
  • Poles: 3
  • Current Rating: 40 A
  • Voltage Rating: 480V
  • Interrupting Rating: 65 kA @ 480V
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous Trip
  • Phase: 3
  • Wire Size: AWG 12 to AWG 2/0, Aluminum; AWG 14 to AWG 2/0, Copper
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Dimensions: 5.66 in (143.76 mm) x 3.92 in (99.57 mm) x 4.05 in (102.87 mm) (Height x Width x Depth)
  • Weight: 4.34 lb
  • Country of Origin: Mexico
  • Certifications: UL 489 Listed, CSA Certified


Product Identification
  • UPC: 785901777021
  • GTIN: 00785901777021