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Square D LJA36400U43X - Molded Case Circuit Breaker 400A 600V 3-Pole

Square D
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Square D LJA36400U43X is a molded case circuit breaker designed for providing robust overcurrent and short-circuit protection in 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 (HxWxD) and weighing 17 lb. This solid-state protection device complies with UL, CSA, NEMA, NOM, and IEC 60947-2 standards, ensuring reliable operation in demanding three-phase applications such as panelboards and switchboards.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Solid State Protection with LSI (Long-Time, Short-Time, Instantaneous) Functions
  • 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) (Height x Width x Depth)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial Power Distribution, Panelboards, Switchboards
  • Switch Type: Circuit Breaker
  • Configuration: 3-Pole
  • Coil Voltage Maximum: Not Applicable
  • Temp Rating: -2 to 70 °C (28 to 158 °F)
  • Shipping Dimensions: See Dimensions
  • Phase: 3-Phase
  • Voltage: 600V
  • Amperage: 400A
  • AIC rating: 65kA @ 480V
  • Connection: I-Line Style Plug-In, Lug Terminal (AL600LF52K3)
  • Poles: 3
  • Protection: Solid State
  • Functions: LSI (Long-Time, Short-Time, Instantaneous)
  • Frame Size: L Frame
  • Trip Type: Solid State
  • Panel Type: Compatible with I-Line Panelboards
  • Breaker Type: Molded Case
  • Control Voltage Minimum: Not Applicable
  • Control Voltage Maximum: Not Applicable
  • Wire Size: AWG 3/0 to 500 kcmil (Aluminium/Copper)
  • Certification: UL, CSA, NOM
  • Circuit Breaker Mounting Style: Plug-In
  • Terminal Connection: I-Line, Lug
  • Frequency Rating: Standard 50/60 Hz
  • Phase Connection: 3-Phase
  • Compatible Frames: I-Line
  • Installation Type: Plug-In Mount


Product Identification
  • UPC: 785901606611
  • GTIN: 00785901606611