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Square D LRA36400U43X - 400A Molded Case Breaker (600V, 3-Pole)

Square D
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Square D LRA36400U43X is a 400A molded case circuit breaker from the Powerpact family, designed for primary protection of electrical distribution systems using solid-state LSI (Long-Time, Short-Time, and Instantaneous) trip functions. This 3-pole breaker is rated for 600V AC and 400A continuous current, with a high interrupting capacity of 200kA at 480V AC to handle severe fault conditions. The unit measures 13.4 in (340 mm) in height, 5.5 in (140 mm) in width, and 4.3 in (110 mm) in depth, weighing 15 lb, and features an I-Line style plug-in connection for direct mounting in compatible switchgear. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, and is certified by UL, CSA, and NOM for reliable performance. This breaker is suited for industrial and commercial three-phase power systems requiring robust overcurrent protection and reverse connection capability.

Key Features & Specifications
  • Type: Molded Case
  • Family: Powerpact
  • Model: LRA
  • Current Rating: 400A
  • Voltage Rating: 600V AC
  • Poles: 3
  • Interrupt Rating: 200kA at 480V
  • Protection: Solid State (LSI - Long-Time, Short-Time, Instantaneous)
  • Connection: I-Line Style Plug-In
  • Dimensions: 13.4 in (340 mm) x 5.5 in (140 mm) x 4.3 in (110 mm) (Height x Width x Depth)
  • Weight: 15 lb
  • Wire Size: AWG 3/0...500 kcmil aluminium/copper
  • Phase: 3
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Certification: UL, CSA, NOM
  • Mounting Type: I-Line plug-in
  • Suitable for 3-phase power systems
  • Designed for industrial and commercial use


LRA36400U43X