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Square D LDL36400CU31X - 400A Molded Case Breaker (600V, 18kA AIC)

Square D
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Square D LDL36400CU31X 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 robust L-frame measuring 340 mm x 140 mm x 110 mm (H x W x D) and weighing 17.09 lb. This 100% rated, solid-state protection device with an 18kA interrupting capacity at 480V is engineered for compliance with UL, CSA, NEMA, NOM, and IEC 60947-2 standards. Its feed-thru lug connection accommodates wire sizes from 2/0 AWG to 500 kcmil, making it suitable for main feeder and branch circuit protection in industrial panels and switchboards.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Solid State Protection, 100% Rated
  • 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
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Shipping Dimensions: As per product dimensions
  • Phase: 3
  • Voltage: 600V
  • Amperage: 400A
  • AIC rating: 18kA @ 480V
  • Connection: Feed-Thru
  • Poles: 3
  • Protection: Solid State
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: L Frame
  • Trip Type: Thermal-Magnetic (LI)
  • Breaker Type: Molded Case
  • MCM Size: Min. 2/0 AWG, Max. 500 kcmil (Cu/Al)
  • Mounting: Fixed
  • Hz: 50/60 Hz
  • Terminal Connection: Lug
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-Phase
  • Compatible Frames: Powerpact L-Frame
  • Installation Type: Fixed
  • Breaker Frame: L Frame
  • Wire Size: 2 x AWG 2/0...500 kcmil aluminium/copper
  • Certification: UL, CSA, NOM
  • Circuit Breaker Mounting Style: Fixed
  • Standards: UL 489, CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1


Product Identification
  • UPC: 078590162666
  • GTIN: 00785901626664