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Figuring out what you need can be challenging! Email for help.
Figuring out what you need can be challenging! Email for help.

Comparc 300 AMP Single Phase MIG Welder

An extremely heavy duty North American made MIG welder intended for industrial applications. This absolute MONSTER of a machine is rated for 300 amps at 40% duty cycle. This will stand up to brutal use cases. This is the answer to the question; how can I absolutely MAX out my single phase power source? 

Comparc has a longstanding agreement with Miller Electric to buy their old IP off them. The MM 300 uses identical technology as the old generation of Millermatic MIG welders, and is proudly built in North America.

Please Note: This machine's shipping weight is 322 pounds and is strapped to a 44W x 21L x 39H skid. You will need a forklift, skid steer, or other heavy machinery to unload. Tailgate delivery can be arranged for those that lack the necessary equipment. The MM 300 ES does not qualify for free freight. Please send an email to prior to ordering. 



  • MIG Welding (GMAW) in diameters of 0.6 to 1.2mm ("0.023" to 0.045")
  • Flux Cored (FCAW) in diameters of 0.9 - 1.2mm (0.030" to 0.045")
  • MIG welding (GMAW) aluminum diameters of 0.9mm (0.035")


  • Adjustable Spot Timers
  • Two / four stroke trigger lock
  • Wire feeder integrated at power supply 
  • Infinite volt adjustment 
  • Digital volt / amp meter
  • 14 pin receptacle for aluminum spool gun


  • Ground Clamp 
  • Cylinder rack and running gear
  • Consumable box
  • Double groove drive roll 0.9"/1.2" (0.035"/0.045")
  • Flow meter w/ 10ft hose
  • 400A 15ft Tregaskiss style MIG gun

Rated Input

1 Phase
60 Hz

Part Number


Rated Output

40% Duty Cycle @ 300A


H. 31" ( 787 mm) W. 14" ( 355mm) L. 38" (965 mm)


Net: 271 lb (123 kg)

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