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Square D LLA36400U43X - Molded Case Circuit Breaker 400A 600V 3P

Square D
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Square D LLA36400U43X is a molded case circuit breaker designed for providing robust overcurrent and short-circuit protection in demanding three-phase industrial power distribution systems. It features a solid-state LSI (Long-Time, Short-Time, Instantaneous) trip unit for precise protection, rated for 400A at 600V with an interrupting capacity of 100kA at 480V. The breaker is constructed with an L-Frame and utilizes a convenient I-Line style plug-in connection, measuring 13.4 in (340 mm) H x 5.5 in (140 mm) W x 4.3 in (110 mm) D and weighing 17 lb. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, ensuring reliable operation in environments from -2 to 70 °C. This unit is typically applied in industrial panels, switchboards, and other electrical distribution equipment requiring high-performance circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Solid State LSI Trip Unit
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Frame Size: L Frame
  • Poles: 3
  • Phase: 3
  • AIC Rating: 100kA @ 480V
  • Connection: I-Line Style Plug-In
  • Protection: LSI (Long-Time, Short-Time, Instantaneous)
  • Wire Size: AWG 3/0 to 500 kcmil (Aluminium/Copper)
  • 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
  • Temp Rating: -2 to 70 °C (28 to 158 °F)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Certification: UL, CSA, NOM
  • Family: Powerpact
  • Country of Origin: United States


Product Identification
  • UPC: 060648628400
  • GTIN: 03606486284001