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Square D MXF36400G - 400A 3-Pole Molded Case Breaker

Square D
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Square D MXF36400G is a 400 amp, 3-pole molded case circuit breaker designed for primary protection of industrial and commercial power distribution systems. It operates at a voltage rating of 600V with a solid state Micrologic trip unit providing LSIG (Long-Time, Short-Time, Instantaneous and Ground Fault) protection and an interrupting rating of 65kA at 480V. The breaker measures 12.86 inches in height, 8.27 inches in width, and 8.05 inches in depth, weighing 50 lb, and features a bolt-on connection with terminal pad mounting. It complies with industry standards for high interrupt capacity applications and is suitable for use in three-phase power distribution systems requiring advanced ground fault detection. This breaker is typically applied in industrial facilities and commercial buildings where reliable circuit interruption and selective coordination are critical.

Key Features & Specifications
  • Manufacturer: Square D
  • Type: MXF Series Molded Case Circuit Breaker
  • Amperage: 400 A
  • Poles: 3
  • Phase: 3
  • Voltage Rating: 600 V
  • Interrupt Rating: 65kA at 480 V
  • Trip Unit: Micrologic Series B LSIG with Ground Fault
  • Functions: LSIG - Long-Time, Short-Time, Instantaneous and Ground Fault
  • Protection: Solid State
  • Connection: Bolt-On
  • Mounting: Terminal Pads Only
  • Dimensions: Depth 8.05 in (204.47 mm) Width 8.27 in (210.06 mm) Height 12.86 in (326.64 mm)
  • Weight: 50 lb
  • Item Subcategory: Molded Case
  • Family: Micrologic


This item does not include Lugs. If you would like lugs please reach out to a sales rep with wiring specs and we can help you with the lugs part number.