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Square D LJA36400U31X - 400A 3-Pole Molded Case Circuit Breaker

Square D
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The Square D LJA36400U31X is a three-pole molded case circuit breaker from the Powerpact family, engineered to provide reliable overcurrent and short-circuit protection for industrial power distribution systems. It features a 400A current rating and a 600V AC voltage rating, with a robust L-frame construction measuring 340 mm H x 140 mm W x 110 mm D and a weight of 17.11 lb. This solid-state protection device complies with UL, CSA, NEMA, and IEC 60947-2 standards and is designed for operation in ambient temperatures from -2°C to 70°C. Its I-Line style plug-in connection and 65kA interrupting capacity at 480V make it suitable for main feeder and branch circuit protection in commercial and industrial panelboards.

Key Features & Specifications
  • Type: LJA Molded Case Circuit Breaker, Solid State Protection with Long-Time and Instantaneous (LI) Trip Functions
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Dimensions: 13.4 in (340 mm) H x 5.5 in (140 mm) W x 4.3 in (110 mm) D
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Main Feeder and Branch Circuit Protection in Industrial/Commercial Power Distribution
  • Switch Type: Circuit Breaker
  • Configuration: Three-Pole
  • Temp Rating: -2°C to 70°C (28°F to 158°F)
  • Phase: 3
  • AIC Rating: 65kA @ 480V AC
  • Connection: I-Line Style Plug-In
  • Poles: 3
  • Protection: Solid State
  • Functions: LI (Long-Time & Instantaneous Trip)
  • Frame Size: L Frame
  • Terminal Connection: I-Line, Lug (Terminal lug AL600LF52K3)
  • Wire Size: 3/0 AWG to 500 kcmil (Aluminium/Copper)
  • Certification: UL, CSA, NOM
  • Phase Connection: ABC
  • Weight: 17.11 lb


Product Identification
  • UPC: 785901648550
  • GTIN: 00785901648550