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Square D MHB36300 - 3-Pole 300A Molded Case Breaker

Square D
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Square D MHB36300 is a 3-pole I-Line style plug-in molded case circuit breaker designed for overcurrent protection in industrial and commercial power distribution systems. It is rated for 300 amperes at 600 VAC and provides thermal-magnetic protection with LI (Long-Time and Instantaneous) trip functions, delivering an interrupting capacity of 65 kA at 480V. The unit features an M Frame size with dimensions of 8.05 in depth, 8.27 in width, and 12.86 in height, weighing 40 lb, and is constructed for modular I-Line panel integration. It complies with UL 489 standards for safety and performance. This breaker is typically applied in main or feeder circuits within switchboards and panelboards requiring high fault current handling.

Key Features & Specifications
  • Type: Molded Case
  • Family: I-Line
  • Type: MHB
  • Dimensions: Depth 8.05 in (204.47 mm) Width 8.27 in (210.06 mm) Height 12.86 in (326.64 mm)
  • Weight: 40 lb
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: M Frame
  • Voltage Rating: 600V
  • Poles: 3
  • Connection: I-Line Style Plug-In
  • Protection: Thermal Magnetic
  • AIC rating: 65kA@480V
  • Phase: 3
  • Current Rating: 300A
  • Amperage Rating: 300 Amps
  • Voltage Rating: 600 VAC
  • Poles: 3-Pole
  • Frame Type: I-Line Style Plug-In
  • Trip Unit: Thermal-Magnetic
  • Interrupting Rating: 65 kA at 480V
  • UL Listed: UL 489


Part Number: MHB36300