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Square D MJA36300YP - Molded Case 300A 600V 3-Pole

Square D
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Square D MJA36300YP is a Schneider Electric PowerPact M series molded case circuit breaker designed for overcurrent protection in industrial and commercial power distribution systems. This three-pole, 300-amp unit is rated for 600VAC and features a solid-state electronic trip unit with LI (Long-Time and Instantaneous) protection functions for precise fault management. The breaker has a depth of 8.05 inches (204.47 mm), a width of 8.27 inches (210.06 mm), and a height of 12.86 inches (326.64 mm), weighing 29 lb, with an I-Line style plug-in connection for secure installation in busway systems. It complies with industry standards and offers an interrupting rating of 65kA at 480VAC. This circuit breaker is suitable for use in panelboards, switchboards, and other power distribution equipment requiring reliable, high-capacity protection.

Key Features & Specifications
  • Manufacturer: Schneider Electric
  • Item Subcategory: Molded Case
  • Family: Powerpact
  • Country of Origin: Mexico
  • Type: MJA
  • Dimensions: Depth 8.05 in (204.47 mm) Width 8.27 in (210.06 mm) Height 12.86 in (326.64 mm)
  • Weight: 29 lb
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: M Frame
  • Voltage Rating: 600V
  • Poles: 3
  • Connection: I-Line Style Plug-In
  • Protection: Solid State
  • AIC rating: 65kA@480V
  • Phase: 3
  • Current Rating: 300A
  • Series: PowerPact M
  • Interrupt Rating: 25 kA @ 600VAC
  • Mounting Type: Bolt-On
  • Trip Unit: Electronic
  • Application: I-Line Busway
  • Handle: Padlockable


Part Number: MJA36300YP