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Square D MJA36300 - 300A Molded Case Breaker (65kA AIC, 600V)

Square D
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The Square D MJA36300 is a Powerpact family molded case circuit breaker designed to provide reliable overcurrent protection for industrial power distribution systems. It features a solid-state protection system with long-time and instantaneous (LI) trip functions, rated for 300A at 600V with an interrupting capacity of 65kA at 480V. The unit is constructed with a robust 800A/M frame, measures 326.64 mm H x 210.06 mm W x 204.47 mm D, and utilizes an I-Line style plug-in connection for three-pole (ABC phase) installation in compatible I-Line panelboards. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards and operates within a temperature range of -25 to 70 °C. This breaker is typically applied in commercial and industrial facilities for main feeder and branch circuit protection, accommodating wire sizes from 3/0 AWG to 500 kcmil via its box lug terminals.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Standard, Solid-State Protection with LI (Long-Time & Instantaneous) Functions
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Frame Size: 800A/M
  • Poles: 3
  • Phase: 3
  • Phase Connection: ABC
  • AIC Rating: 65kA @ 480V
  • Connection: I-Line Style Plug-In
  • Terminal Connection: Box Lug
  • Wire Size: 3 x AWG 3/0 to 3 x 500 kcmil (Aluminium/Copper)
  • MCM Size: Min. 3/0 AWG, Max. 500 MCM
  • Panel Type: I-Line Panelboards
  • Protection: Solid State
  • Breaker Type: Standard
  • 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: 28.739 lb
  • Temp Rating: -25 to 70 °C (-13 to 158 °F)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Certification: UL, CSA, NOM
  • Family: Powerpact
  • Country of Origin: Mexico


Product Identification
  • UPC: 785901862000
  • GTIN: 00785901689560