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Square D LJL36400U43XLY - Molded Case Circuit Breaker 400A 600V

Square D
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Square D LJL36400U43XLY is a molded case circuit breaker designed for providing robust overcurrent protection in demanding three-phase 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 (HxWxD) and weighing 17 lb. This unit is engineered for compliance with UL, CSA, NEMA, NOM, and IEC 60947-2 standards, ensuring reliable operation in environments with ambient temperatures from -2 to 70 °C. Its solid-state LSI (Long-Time, Short-Time, Instantaneous) protection and 65kA interrupting capacity at 480V make it suitable for main feeder and branch circuit protection in industrial plants, data centers, and large commercial facilities.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Powerpact Family, LJL Type, Solid-State Protection
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Dimensions: 13.4 in H x 5.5 in W x 4.3 in D (340 mm x 140 mm x 110 mm)
  • Weight: 17 lb
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial power distribution, main feeders, branch circuits
  • Switch Type: Circuit Breaker
  • Configuration: Fixed
  • Temp Rating: -2 to 70 °C (28 to 158 °F)
  • Phase: 3
  • AIC Rating: 65kA @ 480V
  • Connection: Feed-Thru, Lug Terminal
  • Poles: 3
  • Protection: LSI (Long-Time, Short-Time, Instantaneous)
  • Functions: Overcurrent Protection, Trip Indication
  • Frame Size: L Frame
  • Trip Type: Solid State
  • Wire Size: 2 x AWG 2/0 to 500 kcmil (aluminium/copper)
  • Certification: UL Listed, CSA Certified, NOM


Product Identification
  • UPC: 078590163779
  • GTIN: 00785901637790