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Square D MJA36400YP - Molded Case Circuit Breaker 400A 600V

Square D
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Square D MJA36400YP is a PowerPact M series molded case circuit breaker from Schneider Electric designed for overcurrent protection in industrial and commercial power distribution systems. This 3-pole, 400A unit is rated for 600V AC and provides solid-state LI (Long-Time and Instantaneous) protection via an electronic trip unit. The breaker measures 12.86 in (326.64 mm) x 8.27 in (210.06 mm) x 8.05 in (204.47 mm) and weighs 29.05 lb, featuring an I-Line style plug-in connection for secure mounting in panelboards and switchboards. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, with an AIC rating of 65kA at 480V. Typical applications include main or feeder protection in commercial buildings, industrial facilities, and power distribution equipment requiring reliable, adjustable trip settings.

Key Features & Specifications
  • Manufacturer: Schneider Electric
  • Family: Powerpact
  • Type: MJA
  • Item Subcategory: Molded Case
  • Frame Size: M Frame
  • Poles: 3
  • Current Rating: 400A
  • Voltage Rating: 600V
  • Functions: LI - Long-Time and Instantaneous
  • Protection: Solid State
  • Connection: I-Line Style Plug-In
  • Dimensions: 12.86 in (326.64 mm) x 8.27 in (210.06 mm) x 8.05 in (204.47 mm) (Height x Width x Depth)
  • Weight: 29.05 lb
  • Wire Size: 3 x AWG 3/0...3 x 500 kcmil aluminium/copper
  • AIC rating: 65kA@480V
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Certification: UL, CSA, NOM
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Phase: 3
  • Country of Origin: Mexico


Product Identification
  • GTIN: 00785901572619