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Square D LJA36400U33X - Molded Case Circuit Breaker 400A 600V 65kA

Square D
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Square D LJA36400U33X is a molded case circuit breaker designed for providing robust overcurrent and short-circuit protection in industrial power distribution systems. It features a 400A current rating and a 600V AC voltage rating, housed within a compact L-frame measuring 340 mm x 140 mm x 110 mm (H x W x D) and weighing 18.23 lb. This solid-state trip unit breaker offers long-time, short-time, and instantaneous protection functions, complies with UL, CSA, NEMA, and IEC 60947-2 standards, and is engineered for reliable operation in temperatures from -2°C to 70°C. Its I-Line plug-in connection, 3-pole ABC phase configuration, and 65kA interrupting capacity at 480V make it suitable for protecting feeders and mains in commercial and industrial panelboards.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Solid State Trip Unit, I-Line Plug-In Connection
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Dimensions: 13.4 in (340 mm) x 5.5 in (140 mm) x 4.3 in (110 mm) (H x W x D)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial Power Distribution, Feeder and Main Protection
  • Switch Type: Circuit Breaker
  • Configuration: 3-Pole
  • Phase: 3
  • AIC Rating: 65kA @ 480V
  • Connection: I-Line Style Plug-In, Lug Terminal (AL600LF52K3)
  • Poles: 3
  • Protection: Solid State
  • Functions: Long Time, Short Time, Instantaneous Trip
  • Frame Size: L Frame
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Wire Size: AWG 3/0 to 500 kcmil (Aluminium/Copper)
  • Certification: UL, CSA, NOM
  • Phase Connection: ABC
  • Weight: 18.23 lb


Product Identification
  • UPC: 785901807957
  • GTIN: 00785901807957