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Square D LDA36400CU31X - Molded Case Circuit Breaker 400A 600V

Square D
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The Square D LDA36400CU31X is a 100% rated molded case circuit breaker from the Powerpact family, designed to provide solid-state protection for industrial power distribution systems. It is rated for 600V AC, 400A, and 18kA at 480V, with a 3-pole, 3-phase configuration and an I-Line style plug-in connection. This L Frame breaker measures 13.4 in (340 mm) x 5.5 in (140 mm) x 4.3 in (110 mm) and weighs 17 lb, featuring a MicroLogic 3.3 trip unit for Long Time and Instantaneous trip functions, with terminal connections for I-Line and lug, accommodating wire sizes from 2 x AWG 2/0 to 500 kcmil aluminum or copper. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, with an operating temperature range of 28-158 °F (-2-70 °C). This breaker is suitable for industrial applications requiring high continuous current capacity and reliable overcurrent protection in panelboards or switchboards.

Key Features & Specifications
  • Type: Molded Case, Solid State, 100% rated
  • 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) (H x W x D)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial power distribution, panelboards, switchboards
  • Switch Type: Circuit Breaker
  • Configuration: 3-Pole, 3-Phase
  • Coil Voltage Maximum: Not applicable
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Shipping Dimensions: Not specified
  • Phase: 3
  • Voltage: 600V
  • Amperage: 400A
  • AIC rating: 18kA@480V
  • Connection: I-Line Style Plug-In
  • Poles: 3
  • Protection: Solid State
  • Functions: Long Time and Instantaneous Trip
  • Frame Size: L Frame
  • Trip Type: MicroLogic 3.3
  • Panel Type: I-Line
  • Breaker Type: 100% rated
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: 2/0 to 500 kcmil
  • Metal Type: Not specified
  • Panel Style: I-Line
  • Bus Type: Not specified
  • Fuse Class: Not applicable
  • Insulation Temperature: Not specified
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • 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 applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: Not specified
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: 2 x AWG 2/0...500 kcmil
  • Amperage Maximum: 400A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: Not applicable
  • Wire Size: 2 x AWG 2/0...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 applicable
  • Breaker Frame: L Frame
  • Current Rating: 400A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not specified
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: 70 °C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 78590110163
  • GTIN: 00785901101635