Big Blue® 400 Pro Engine-Driven Welder | Miller - MillerWelds

Big Blue 400 Pro (Mitsubishi)

Designed with the professional in mind, the Big Blue 400 Pro is the best for ease of use, reliability and fuel economy.
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Heavy-Duty Low-Speed Mitsubishi S4L2 Industrial Diesel Engine
Used in applications around the world, the S4L2 is designed to operate over 10,000 hours before major overhaul.  Backed by worldwide support and service.
Multi-function Fuel Gauge
Displays fuel level and engine hours, and can be customized to set oil change interval reminders. In the case of high coolant temperature, low oil pressure, or low fuel level, the engine will shut down to prevent damage, or make restarting easier.
Superior Arc Performance
Hot Start™ Stick, four preset DIG settings for Stick, and Lift-Arc™ TIG with Auto-Stop™ allows welders to fine-tune their arc characteristics for optimum performance.
Quiet Operation
Improves work site safety and communication.
Simple-to-Set Controls
Requires no elaborate procedure - just select process and weld!
Auto Remote Sense™ (ARS)
Detects if a remote control is plugged into the 14-pin receptacle and eliminates confusion of a remote/panel switch.
Thermal Overload Protection
Prevents machine damage if the duty cycle is exceeded or airflow is blocked.
Other Standard Features
Digital preset weld meters, output contactor control, automatic idle and 120V block heater.



Air Carbon Arc Cutting and Gouging (CAC-A)
Flux Cored (FCAW)
Stick (SMAW)

General Specifications

Title Big Blue 400 Pro (Mitsubishi)
Industries Interests Construction
Heavy Equipment Manufacturing
Maintenance and Repair - Field Operations
Work / Service Trucks
Carbon Diameter 3/16 in (4.8 mm)
Cold Weather Starting Aids Engine Block Heater
Glow Plugs
Current Type DC
Engine Brand Mitsubishi
Engine Compliance T4F
Engine Idle Speed 1500 RPM
Portability Lift Eye (Standard)
Trailer (Optional)
Engine Weld Speed 1800 RPM
Fuel Tank Size 11.5 Gallon
Net Height 32 in
Fuel Type Diesel
Net Length 56 in
Horsepower 24.7 hp
Max Open Circuit Voltage 85 VDC
Net Weight 993 lbs
Weldable Metals Stainless Steel
Mild Steel
Net Width 26.25 in
Rated Output 300 A at 32 V, 100% duty cycle
Single Phase Generator Continuous Power 10000 W
Warranty Engine Warranties
Miller's True Blue Warranty
Single Phase Generator Peak Power 12000 W
Sound Rating Idle: 68.7 dB / Weld: 72.1 dB
Amperage Range 20 - 400