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Square D MGA36300 - Molded Case Circuit Breaker 300A 600V 3P

Square D
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Square D MGA36300 is a molded case circuit breaker designed for providing reliable overcurrent protection in industrial power distribution systems. It features a 300A current rating and a 600V voltage rating, housed within a compact M-frame measuring 326.64 mm H x 210.06 mm W x 204.47 mm D and weighing 29 lb. The breaker is constructed with solid-state protection for LI (Long-time and Instantaneous) trip functions and complies with UL, CSA, NEMA, NOM, and IEC 60947-2 standards. Its I-Line style plug-in connection and lug terminals support 3-pole, 3-phase applications, making it suitable for protecting feeders and branch circuits in commercial and industrial panels.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Solid State Protection, I-Line Plug-In
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: 326.64 mm H x 210.06 mm W x 204.47 mm D (12.86 in x 8.27 in x 8.05 in)
  • Weight: 29 lb
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial Power Distribution, Feeder and Branch Circuit Protection
  • Switch Type: Circuit Breaker
  • Configuration: 3-Pole
  • Temp Rating: -25 to 70 °C (-13 to 158 °F)
  • Phase: 3
  • AIC Rating: 35kA at 480V
  • Connection: I-Line Style Plug-In, Lug Terminal
  • Poles: 3
  • Protection: Solid State, LI (Long-Time and Instantaneous) Trip
  • Functions: LI - Long-Time and Instantaneous Trip
  • Frame Size: M
  • Wire Size: 3 x AWG 3/0 to 3 x 500 kcmil (Aluminium/Copper)
  • Certification: UL, CSA, NOM
  • MCM Size: Minimum 3/0 AWG, Maximum 500 kcmil (Cu/Al)
  • Terminal Connection: I-Line, Lug


Product Identification
  • UPC: 785901496038
  • GTIN: 00785901496038