Big Blue 400X Pro with ArcReach

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Designed for the professional. Easy to use, reliable & fuel efficient.

  • Structural Steel
  • Process Piping
  • Mining Maintenance
  • Maintenance and Repair Rigs
  • Construction
  • Stick SMAW
  • RMD
  • Pulsed MIG GMAW-P
  • Flux-Cored FCAW
  • Air Carbon Arc CAC-A
  • Constant Current & Constant Voltage Weld Output
  • Direct Current Weld Output
  • Single Phase Input Power

Big Blue 400X Pro with ArcReach

ArcReach welding technology minimises the non-value added time spent walking to and from the power source - and maximises arc-on time, weld quality and jobsite safety.

Auto Remote Sense™

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

HD Powder Coat

With zinc-rich primer protects sheet metal from rust and corrosion.

Infinite Arc Control

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

Lift-Arc Tig with Auto crater and Auto Stop

Lift-Arc TIG provides soft TIG arc starting without the use of high frequency, while Auto Crater and Auto Stop eliminates tungsten and workpiece contamination.

Thermal Overload Protection

Prevents machine damage if the duty cycle is exceeded or airflow is blocked.

Standard Features

  • ArcReach
  • Digital Preset Weld Meters
  • Automatic Idle
  • Cold Weather Starting Aids

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.

Industrial USB Port

Quickly upload the latest software and download machine log files to retrieve in-depth information such
as diagnostics and machine statistics.

Remote Oil Drain

Prevents spills and makes servicing easy.

Big Blue 400X Pro with ArcReach

Big Blue 400X Pro with ArcReach

Arc Control

Beneficial when welding with stick and solid wires for easier fine tuning of tough-to-weld materials and out-of-position applications.

Auxiliary Power*

  • 1 x 240 V 60 Hz 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 air-conditioners, may not operate correctly and could be damaged. Refer to appliance supplier or manufacturer to confirm suitability.

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.

Heavy-Duty Low-Speed Industrial Diesel Engines

3 Year Warranty

Welder/generator is warranted by Miller for 3 years, parts and labour. For details, refer to the Miller warranty statement. Engine is warranted separately by engine manufacturer.

Welding ModeAmp/Volt RangeRated OutputGenerator PowerDimensions (mm)Weight* (Without Fuel)

CC/DC (Stick/TIG)

20 – 400 A300 A at 32 VDC, 100% Duty Cycle
350 A at 27 VDC, 100% Duty Cycle
400 A at 24 VDC, 100% Duty Cycle
Peak: 12,000 Watts
Continuous: 10,000 Watts
42 A, 240 VAC, 60 Hz
H: 813
W: 667
D: 1422
Net: 431 kg
Shipping: 456 kg

*Additional 75kg when fuel tank is full. 

CV/DC (MIG/FCAW)14 - 40 V