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Square D MJA36800 - 800A Molded Case Circuit Breaker, 65kA AIC

Square D
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The Square D MJA36800 is a Powerpact molded case circuit breaker designed to provide reliable overcurrent and short-circuit protection for industrial power distribution systems. It features a solid-state trip unit with long-time and instantaneous (LI) protection functions, rated for 800A at 600V with an interrupting capacity of 65kA at 480V. The three-pole breaker is constructed for panel mounting in I-Line panelboards, with a robust frame size of 800A/M, box lug terminals, and an operating temperature range of -25 to 70 °C (-13 to 158 °F). It complies with major industry standards including UL, CSA, NEMA, and IEC 60947-2, ensuring suitability for a wide range of commercial and industrial applications requiring robust circuit protection.

Key Features & Specifications
  • Type: Powerpact MJA Series, Molded Case Circuit Breaker with Solid-State Trip Unit
  • Voltage Rating: 600V AC
  • Current Rating: 800A
  • Frame Size: 800A/M
  • AIC Rating: 65kA @ 480V
  • Poles: 3
  • Phase Connection: 3-Phase (ABC)
  • Protection Functions: Long-Time & Instantaneous (LI)
  • Trip Type: Solid State
  • Connection: Panel Mount
  • 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
  • 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: 28.55 lb
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Panel Type: I-Line Panelboards
  • Breaker Type: Standard
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Certification: UL, CSA, NOM


Product Identification
  • UPC: 785901572701
  • GTIN: 00785901572701