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Square D LGA36400U43X - Molded Case Circuit Breaker 400A 600V

Square D
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Square D LGA36400U43X is a 3-pole molded case circuit breaker from the Powerpact family, designed to provide solid-state protection with long time, short time, and instantaneous trip functions. It is rated for 600V AC, 400A continuous current, and delivers an AIC rating of 35kA at 480V, suitable for 3-phase industrial power distribution. The unit measures 13.4 in (340 mm) x 5.5 in (140 mm) x 4.3 in (110 mm) (H x W x D), weighs 17 lb, and features an I-Line style plug-in connection with I-Line and lug terminals, accepting AWG 3/0 to 500 kcmil aluminum or copper wire. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, and operates within a temperature range of 28-158 °F (-2-70 °C). This breaker is typically applied in commercial and industrial switchboards, panelboards, and motor control centers requiring reliable overcurrent and short-circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Powerpact L Frame, Solid State Trip
  • 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 switchboards, panelboards, motor control centers
  • Switch Type: I-Line Style Plug-In
  • Configuration: 3-Pole, 3-Phase
  • Coil Voltage Maximum: Not applicable (solid state trip)
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Shipping Dimensions: Not specified
  • Phase: 3
  • Voltage: 600V
  • Amperage: 400A
  • AIC rating: 35kA@480V
  • Connection: I-Line Style Plug-In
  • Poles: 3
  • Protection: Solid State (Long Time, Short Time, Instantaneous Trip)
  • Functions: Long Time, Short Time, Instantaneous Trip
  • Frame Size: L Frame
  • Trip Type: Solid State
  • Panel Type: Not specified
  • Breaker Type: Molded Case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: AWG 3/0...500 kcmil
  • Metal Type: Not specified
  • Panel Style: Not specified
  • Bus Type: Not specified
  • Fuse Class: Not applicable
  • Insulation Temperature: Not specified
  • Inductance: Not specified
  • Impedance: Not specified
  • Barrels: Not specified
  • Class Rating: Not specified
  • Diameter: Not specified
  • Velocity: Not specified
  • Clip Center: Not specified
  • Clas: Not specified
  • Mounting: I-Line Plug-In
  • Hz: Not specified
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: Not specified
  • Dist Voltage: Not specified
  • Bucket Size: Not specified
  • Bucket Style: Not specified
  • Bucket Type: Not specified
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: Not specified
  • Relay Style: Not specified
  • Coil Voltage Minimum: Not applicable
  • Wire: AWG 3/0...500 kcmil
  • Amperage Maximum: 400A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: I-Line Style Plug-In
  • Wire Size: AWG 3/0...500 kcmil
  • Certification: UL, CSA, NOM
  • Circuit Breaker Mounting Style: I-Line Plug-In
  • Terminal Connection: I-Line, Lug
  • Frequency Rating: Not specified
  • Phase Connection: 3-Phase
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Compatible Frames: L Frame
  • Installation Type: Plug-In
  • Item QTY: 1
  • Nema Starter Size: Not specified
  • Breaker Frame: L Frame
  • Current Rating: 400A
  • Reverse Standoff Voltage: Not specified
  • Watts: Not specified
  • Peak Pulse Current: Not specified
  • Breakdown Voltage (MIN VBR@IT ) (V): Not specified
  • Breakdown Voltage (VBR@IT) (V): Not specified
  • Polarity: Not specified
  • Operating Temperature Maximum Celsius: 70 °C
  • Max Clamp Voltage: Not specified
  • On-State Current: Not specified


Product Identification
  • UPC: 785901702641
  • GTIN: 00785901702641