Miller Big Blue 400X Pro with ArcReach

The professional welders choice


Designed with the professional in mind, the Big Blue 400X Pro is the best for ease of use, reliability & fuel economy.

Heavy-duty low-speed Kubota V1505 industrial diesel engine.

Improves work site safety and communication.

Spend more time welding, less time walking with ArcReach technology.

Where to Buy

Product Overview


  • Construction
  • Structural Steel
  • Mining Maintenance
  • Maintenance and Repair Rigs
  • Process Piping

What's In The Box

  • Miller Big Blue 400X Pro with ArcReach


For details, refer to the Miller warranty statement.

Infinite Arc Control

Allows the arc characteristics to be changed for specific applications in Stick, TIG, MIG and FCAW.

Auto Remote Sense

Detects if a remote control is plugged into the 14-pin receptacle and eliminates confusion of a remote/panel switch.

Heavy-Duty Low-Speed Industrial Diesel Engines

Low OCV Stick (VRD)

Reduces the open-circuit voltage to 30 volts when the welding power source is not in use. This feature is now built into the Big Blue 400X Pro for increased operator safety without compromising arc starts.

Digital Meters

SunVision technology enables welding parameters to be viewed with greater clarity than analogue meters at virtually any angle. Meters can be seen clearly even in direct sunlight.

Auxiliary Power

  • 1 x 240 V 60Hz 32 Amp 1 Phase Socket.
  • 2 x 240 V 60 Hz 15 Amp 1 Phase Socket.
  • RCD.

*Generator auxiliary power is 60Hz, and intended for operating equipment associated with welding, such as angle grinders, drills and floodlights. Some Australian 50Hz equipment incorporating induction motors, such as pumps, fans, air compressors, refrigeration or airconditioners, may not operate correctly and could be damaged. Refer to appliance supplier or manufacturer to confirm suitability.


  • MIG
  • Stick
  • TIG
  • 1 Phase
  • Rated Output
    300 A at 32 VDC, 100% Duty Cycle
    350 A at 27 VDC, 100% Duty Cycle
    400 A at 24 VDC, 100% Duty Cycle
  • Generator Continuous Power
    10,000 watts
  • Generator Peak Power
    12,000 watts
  • Rated Carbon Diameter
  • Current Type
  • Max Open Circuit Voltage
    85 VDC
  • Amperage Range
    CC/DC (Stick/TIG) 20 – 400 A
    CV/DC (MIG/FCAW) 14 – 40A
  • Weld Output
    CC / CV
  • Dimensions (mm)
    H: 813 mm
    H: 667 mm
    D: 1422 mm
  • Weight (without fuel)
    431kg - Additional 75kg when fuel tank is full
  • Shipping Weight (without fuel)

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