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Square D LDA36400U43X - Molded Case Breaker 400A 600V 3P

Square D
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Square D LDA36400U43X is a molded case circuit breaker designed for providing comprehensive overcurrent and short-circuit protection in three-phase 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 H x 140 mm W x 110 mm D and weighing 17 lb. The breaker utilizes solid-state protection with Long-Time, Short-Time, and Instantaneous (LSI) trip functions and is certified to UL, CSA, NEMA, NOM, and IEC 60947-2 standards. Its I-Line style plug-in connection and lug terminals support conductors from AWG 3/0 to 500 kcmil, making 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, LSI Trip Functions
  • 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)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial Power Distribution, Main Feeder & Branch Circuit Protection
  • Switch Type: Circuit Breaker
  • Configuration: 3-Pole
  • Connection: I-Line Style Plug-In, Lug Terminals
  • Phase: 3
  • AIC Rating: 18kA @ 480V
  • Protection: Solid State
  • Functions: Long-Time, Short-Time, Instantaneous (LSI)
  • Frame Size: L Frame
  • Wire Size: AWG 3/0 to 500 kcmil (Aluminium/Copper)
  • Certification: UL, CSA, NOM
  • Temp Rating: -2 to 70 °C (28 to 158 °F)
  • Weight: 17 lb


Product Identification
  • GTIN: 03606486283714