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Square D MHF36300 - Molded Case Circuit Breaker 300A 600V 3P

Square D
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Square D MHF36300 is a molded case circuit breaker designed for providing reliable overcurrent protection in demanding three-phase industrial power systems. It features a 300A current rating and a 600V voltage rating, engineered to interrupt fault currents up to 65kA at 480V AC. The breaker utilizes a robust thermal-magnetic trip unit for combined long-time and instantaneous (LI) protection and is constructed in a three-pole, bolt-on configuration within a compact M-frame design, weighing 38 lb. This unit complies with relevant industry standards for safety and performance and is typically applied in panelboards, switchboards, and industrial control equipment where dependable circuit protection is critical.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal-Magnetic Protection, Long-Time and Instantaneous (LI) Trip Functions
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Frame Size: M Frame
  • AIC Rating: 65kA at 480V AC
  • Poles: 3
  • Phase: 3-Phase
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Weight: 38 lb
  • Standards: Meets applicable industry standards for circuit interruption and safety
  • Applications: Industrial power distribution, panelboards, switchboards, motor control centers
  • Additional Info: Lugs are not included; specific lug part numbers require wiring specifications.