PROFAX® PX300CV Heavy-Duty MIG & Flux-Cored Welding Machine – 300 Amp Constant Voltage Power Source

Industrial-duty MIG welding performance built for fabrication, manufacturing, and production.
The PROFAX® PX300CV is a heavy-duty 300 Amp constant voltage (CV) welding power source engineered for demanding MIG (GMAW) and Flux-Cored (FCAW) welding applications. Designed as a direct replacement for the Miller® CP302, the PX300CV combines simple operation, rugged reliability, and professional-grade performance with a variety of package options to fit your shop's needs.

Whether you need the power source only or a complete ready-to-weld system with wire feeder, MIG gun, or spool gun, the PX300CV delivers dependable arc performance backed by a 3-year warranty.

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Why Fabricators Choose the PX300CV

• Heavy-Duty Industrial Performance: Built for continuous production welding.
• Direct Replacement: Designed as a replacement for the Miller® CP302.
• Simple Operation: Easy voltage adjustment with analog meters for quick setup.
• Multiple Package Options: Available as a power source only or complete welding packages.

Key Features

• 300 Amp DC Constant Voltage (CV) power source
• MIG (GMAW) and Flux-Cored (FCAW) welding
• Single-knob voltage adjustment
• Preset welding voltage for fast setup
• Adjustable inductance control for improved arc characteristics
• Analog voltmeter and ammeter
• 14-pin receptacle for compatible wire feeders and spool guns
• Protected lower front panel
• Industrial-duty construction
• 3-Year Parts & Labor Warranty
• Requires 230V or 460V Three-Phase Power

Available Package Options

Select the configuration that best fits your application:

Applications

• Structural fabrication
• Heavy equipment manufacturing
• Shipbuilding
• Industrial fabrication
• Production welding
• Maintenance and repair

Supported Welding Processes

• MIG (GMAW)
• Flux-Cored (FCAW)

Frequently Asked Questions

Does this machine require three-phase power?
Yes. The PX300CV requires either 230V or 460V three-phase input power.

Can I purchase just the power source?
Yes. The standard PX300CV package includes only the welding power source.

What is the difference between the 2-roll and 4-roll packages?
The 4-roll wire feeder provides additional wire feeding stability, particularly when welding with longer gun cables or softer wire.

Is this a replacement for the Miller® CP302?
Yes. The PX300CV was designed as a direct replacement for the Miller® CP302 constant voltage welding power source.

Does it include running gear?
Only packages ending in RG include the factory-installed running gear with cylinder rack and lead hangers.

Note: Availability may vary. Please contact Arc-Zone® for current lead times if the machine is backordered.