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Square D LJA36400CU31X - Molded Case Circuit Breaker 400A 600V 3P

Square D
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Square D LJA36400CU31X is a molded case circuit breaker designed for providing reliable overcurrent protection in industrial power distribution systems. It features a 400A current rating and a 600V voltage rating, housed within a compact L-frame measuring 340 mm x 140 mm x 110 mm (H x W x D) and weighing 18.75 lb. This 100% rated, 3-pole breaker utilizes solid-state protection with long-time and instantaneous trip functions, ensuring compliance with UL, CSA, NEMA, NOM, and IEC 60947-2 standards. Its I-Line style plug-in connection and lug terminals, compatible with 2/0 to 500 kcmil aluminum or copper wire, make it suitable for main feeder and branch circuit protection in commercial and industrial panels, offering an interrupting capacity of 65kA at 480V and an operational temperature range of -2 to 70 °C.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, LJA Type, Solid State Protection
  • 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: Industrial Power Distribution, Main Feeders, Branch Circuits
  • Switch Type: Circuit Breaker
  • Configuration: 3-Pole
  • Phase: 3
  • AIC Rating: 65kA @ 480V
  • Connection: I-Line Style Plug-In, Lug Terminal
  • Poles: 3
  • Protection: Solid State
  • Functions: Long Time and Instantaneous Trip
  • Frame Size: L Frame
  • Breaker Type: 100% Rated
  • Temp Rating: -2 to 70 °C (28 to 158 °F)
  • Wire Size: 2 x AWG 2/0 to 500 kcmil (Aluminum/Copper)
  • Certification: UL, CSA, NOM
  • Terminal Connection: Lug (AL600LS52K3)
  • Weight: 18.75 lb


Product Identification
  • UPC: 078590139543
  • GTIN: 00785901395430