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Square D LDF36400U31X - Molded Case Circuit Breaker 400A 600V 3P

Square D
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Square D LDF36400U31X is a molded case circuit breaker designed for providing reliable overcurrent protection in 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 (H x W x D) and weighing 15 lb. This solid-state protection device utilizes Long-Time and Instantaneous (LI) trip functions, is compliant with UL, CSA, NEMA, NOM, and IEC 60947-2 standards, and operates within a temperature range of -2 to 70 °C. Its bolt-on connection, 18kA interrupting capacity at 480V, and compatibility with conductors from 2/0 AWG to 500 kcmil make it suitable for main feeder and branch circuit protection in commercial and industrial panelboards.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Solid State Protection, L Frame
  • 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, Main Feeders, Branch Circuits
  • Switch Type: Circuit Breaker
  • Configuration: Fixed
  • Phase: 3
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Overcurrent
  • Functions: LI (Long-Time and Instantaneous)
  • Frame Size: L Frame
  • Trip Type: Solid State
  • AIC Rating: 18kA @ 480V
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Wire Size: 2 x AWG 2/0...500 kcmil aluminium/copper
  • Certification: UL, CSA, NOM
  • Weight: 15 lb


Product Identification
  • UPC: 078590108674
  • GTIN: 00785901086741