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Square D MGF36300 - Molded Case Circuit Breaker 300A 600V

Square D
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The Square D MGF36300 is a 3-pole molded case circuit breaker from the Powerpact family, designed to provide solid-state protection for electrical systems. It is rated for 600V AC, 300A, and 35kA interrupting capacity at 480V, with LI (Long-Time and Instantaneous) trip functions. This bolt-on breaker measures 12.86 in x 8.27 in x 8.05 in (H x W x D), weighs 29 lb, and accepts wire sizes from 3 x AWG 3/0 to 3 x 500 kcmil aluminum/copper. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, operating within a temperature range of -13°F to 158°F (-25°C to 70°C). Typical industrial applications include main or feeder protection in three-phase power distribution systems.

Key Features & Specifications
  • Type: Molded Case, Solid State
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: 12.86 in (326.64 mm) x 8.27 in (210.06 mm) x 8.05 in (204.47 mm) (Height x Width x Depth)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Main or feeder protection in three-phase power distribution
  • Switch Type: Molded Case
  • Configuration: 3-Pole
  • Coil Voltage Maximum: N/A
  • Temp Rating: -13°F to 158°F (-25°C to 70°C)
  • Shipping Dimensions: N/A
  • Phase: 3
  • Voltage: 600V
  • Amperage: 300A
  • AIC rating: 35kA@480V
  • Connection: Bolt-On
  • Poles: 3
  • Protection: Solid State
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: MGF
  • Trip Type: Solid State
  • Panel Type: N/A
  • Breaker Type: Molded Case
  • Control Voltage Minimum: N/A
  • Control Voltage Maximum: N/A
  • MCM Size: 500 kcmil
  • Metal Type: N/A
  • Panel Style: N/A
  • Bus Type: N/A
  • Fuse Class: N/A
  • Insulation Temperature: N/A
  • Inductance: N/A
  • Impedance: N/A
  • Barrels: N/A
  • Class Rating: N/A
  • Diameter: N/A
  • Velocity: N/A
  • Clip Center: N/A
  • Clas: N/A
  • Mounting: Bolt-On
  • Hz: N/A
  • Coil Material: N/A
  • Horse Power: N/A
  • Aux Contacts: N/A
  • CPT: N/A
  • Full Load Amps: N/A
  • Dist Voltage: N/A
  • Bucket Size: N/A
  • Bucket Style: N/A
  • Bucket Type: N/A
  • Full Load Amp Maximum: N/A
  • Full Load Amp Minimum: N/A
  • Enclosure: N/A
  • Relay Style: N/A
  • Coil Voltage Minimum: N/A
  • Wire: 3 x AWG 3/0...3 x 500 kcmil aluminium/copper
  • Amperage Maximum: 300A
  • Amperage Minimum: N/A
  • Nema Rating: N/A
  • Switch Style: N/A
  • Wire Size: 3 x AWG 3/0...3 x 500 kcmil aluminium/copper
  • Certification: UL, CSA, NOM
  • Circuit Breaker Mounting Style: Bolt-On
  • Terminal Connection: Bolt-On
  • Frequency Rating: N/A
  • Phase Connection: 3-Phase
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Compatible Frames: Powerpact
  • Installation Type: Bolt-On
  • Item QTY: 1
  • Nema Starter Size: N/A
  • Breaker Frame: MGF
  • Current Rating: 300A
  • Reverse Standoff Voltage: N/A
  • Watts: N/A
  • Peak Pulse Current: N/A
  • Breakdown Voltage (MIN VBR@IT ) (V): N/A
  • Breakdown Voltage (VBR@IT) (V): N/A
  • Polarity: N/A
  • Operating Temperature Maximum Celsius: 70°C
  • Max Clamp Voltage: N/A
  • On-State Current: N/A


Product Identification
  • UPC: 78590146087
  • GTIN: 00785901460879