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Square D MJA36300YP - Powerpact 300A 3-Pole Breaker

Square D
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The Square D MJA36300YP is a Powerpact molded case circuit breaker designed for overcurrent protection in industrial power distribution systems. It is rated for 600V AC, 300A, and 65kA interrupting capacity at 480V, with solid-state trip technology providing LI (Long-Time and Instantaneous) protection functions. This three-pole breaker features an M Frame size, I-Line style plug-in connection, and measures 12.86 x 8.27 x 8.05 inches, weighing 29 lb. It is manufactured by Schneider Electric in Mexico and complies with industry standards for three-phase applications. Typical uses include protecting feeders, motors, and branch circuits in commercial and industrial electrical panels.

Key Features & Specifications
  • Type: Powerpact Molded Case Circuit Breaker, Solid State Trip
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: Height 12.86 in (326.64 mm), Width 8.27 in (210.06 mm), Depth 8.05 in (204.47 mm)
  • Standards: UL, CSA, NEMA
  • Applications: Industrial power distribution, feeder protection, motor protection
  • Switch Type: Molded Case
  • Configuration: 3-Pole
  • Coil Voltage Maximum: Not applicable (solid state trip)
  • Temp Rating: Not specified
  • Shipping Dimensions: Not specified
  • Phase: 3
  • Voltage: 600V
  • Amperage: 300A
  • AIC rating: 65kA@480V
  • Connection: I-Line Style Plug-In
  • Poles: 3
  • Protection: Solid State (LI - Long-Time and Instantaneous)
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: M Frame
  • Trip Type: Solid State
  • Panel Type: Not specified
  • Breaker Type: Powerpact
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not specified
  • Metal Type: Not specified
  • Panel Style: Not specified
  • Bus Type: Not specified
  • Fuse Class: Not applicable
  • Insulation Temperature: Not specified
  • Inductance: Not specified
  • Impedance: Not specified
  • Barrels: Not specified
  • Class Rating: Not specified
  • Diameter: Not specified
  • Velocity: Not specified
  • Clip Center: Not specified
  • Clas: Not specified
  • Mounting: Plug-In
  • Hz: Not specified
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: Not specified
  • Dist Voltage: Not specified
  • Bucket Size: Not specified
  • Bucket Style: Not specified
  • Bucket Type: Not specified
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: Not specified
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not specified
  • Amperage Maximum: 300A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: Not specified
  • Wire Size: Not specified
  • Certification: UL, CSA
  • Circuit Breaker Mounting Style: Plug-In
  • Terminal Connection: I-Line
  • Frequency Rating: Not specified
  • Phase Connection: 3-Phase
  • Standards: UL 489, CSA C22.2
  • Compatible Frames: M Frame
  • Installation Type: Plug-In
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: M Frame
  • Current Rating: 300A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not specified
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: Not specified
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: Not available
  • GTIN: Not available