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Square D LDA36400U44XEN - Molded Case Circuit Breaker 400A 600V

Square D
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Square D LDA36400U44XEN is a Powerpact L Frame molded case circuit breaker designed for solid-state LSIG protection (Long-Time, Short-Time, Instantaneous, and Ground Fault) in three-phase power distribution systems. It is rated for 600V AC, 400A continuous current, and an interrupting capacity of 18kA at 480V AC, operating within a temperature range of 28 to 158 °F (-2 to 70 °C). The unit features a 3-pole configuration with I-Line and lug terminal connections, measures 13.39 inches (340 mm) in height, 4.44 inches (112.78 mm) in width, and 3.09 inches (78.49 mm) in depth, weighing 5.19 lb. This breaker complies with UL, CSA, NEMA, NOM, and IEC standards, making it suitable for industrial switchboards, panelboards, and motor control centers requiring coordinated ground fault protection.

Key Features & Specifications
  • Type: Powerpact LDA Molded Case Circuit Breaker, Solid State Trip
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Dimensions: Height 13.39 in (340 mm) x Width 4.44 in (112.78 mm) x Depth 3.09 in (78.49 mm)
  • Standards: UL, CSA, NEMA, NOM, IEC
  • Applications: Industrial switchboards, panelboards, motor control centers
  • Switch Type: I-Line
  • Configuration: 3-Pole
  • 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: 18kA@480V
  • Connection: I-Line, Lug
  • Poles: 3
  • Protection: LSIG (Long-Time, Short-Time, Instantaneous, Ground Fault)
  • Functions: Solid State 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: Not specified
  • 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
  • Hz: 50/60 Hz
  • 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 applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not specified
  • Amperage Maximum: 400A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: I-Line
  • Wire Size: Not specified
  • Certification: UL, CSA, NEMA, NOM, IEC
  • Circuit Breaker Mounting Style: I-Line
  • Terminal Connection: I-Line, Lug
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-Phase
  • Standards: UL, CSA, NEMA, NOM, IEC
  • Compatible Frames: L Frame
  • Installation Type: Panelboard/Switchboard
  • 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: Not available
  • GTIN: Not available