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Square D LJA36400U54X - Molded Case Circuit Breaker 400A 600V

Square D
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The Square D LJA36400U54X is a Powerpact L-frame molded case circuit breaker designed to provide comprehensive LSIG (Long-Time, Short-Time, Instantaneous, and Ground Fault) protection for three-phase industrial power distribution systems. It features a 400A current rating and a 600V AC voltage rating, housed in a robust solid-state trip unit within compact dimensions of 340 mm H x 140 mm W x 110 mm D and a weight of 17 lb. This breaker is engineered for compliance with UL, CSA, NEMA, NOM, and IEC 60947-2 standards, ensuring reliable operation in environments with ambient temperatures from -2°C to 70°C. Its I-Line style plug-in connection and lug terminals accommodating AWG 3/0 to 500 kcmil conductors make it suitable for main feeder and branch circuit protection in commercial and industrial panelboards, with an interrupting capacity of 65kA at 480V AC.

Key Features & Specifications
  • Type: Powerpact L-Frame Molded Case Circuit Breaker with Solid-State LSIG Trip Unit
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Dimensions: 340 mm H x 140 mm W x 110 mm D (13.4 in x 5.5 in x 4.3 in)
  • 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: 3-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 LSIG (Long-Time, Short-Time, Instantaneous, Ground Fault)
  • Functions: LSIG Protection
  • Frame Size: L Frame
  • Wire Size: AWG 3/0 to 500 kcmil (Aluminium/Copper)
  • Certification: UL, CSA, NOM
  • Terminal Connection: I-Line, Lug (Terminal Lug AL600LF52K3)
  • Weight: 17 lb


Product Identification
  • UPC: 060648628440
  • GTIN: 03606486284407