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Square D MJM36600 - Molded Case 600A 3-Pole Breaker

Square D
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Square D MJM36600 is a 600 Amp, 3-pole molded case circuit breaker from the Powerpact family, designed for reliable circuit protection in industrial and commercial applications. It operates at a voltage rating of 600V and features a solid-state LI (Long-Time and Instantaneous) protection function, with a high interrupting capacity of 65kA at 480V. The unit measures 12.86 inches in height, 4.44 inches in width, and 3.09 inches in depth, weighing 34 lb, and utilizes a bolt-on connection with an M Frame size. This breaker complies with industry standards for three-phase systems and is rated for operation in temperatures ranging from -13°F to 158°F (-25°C to 70°C). It is typically applied in main switchboards, distribution panels, and heavy-load feeder circuits requiring robust overcurrent protection.

Key Features & Specifications
  • Manufacturer: Square D
  • Item Subcategory: Molded Case
  • Family: Powerpact
  • Type: MJM
  • Dimensions: Height 12.86 in (326.64 mm) x Depth 3.09 in (78.49 mm) x Width 4.44 in (112.78 mm)
  • Weight: 34 lb
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: M Frame
  • Voltage Rating: 600V
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Solid State
  • Wire Size: 3 x AWG 3/0...3 x 500 kcmil aluminum/copper
  • AIC rating: 65kA@480V
  • Phase: 3
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Current Rating: 600A
  • Amperage: 600 Amps
  • Mounting Type: Molded Case
  • Trip Unit: Thermal Magnetic


Part Number: MJM36600