Processes
Stick (SMAW), MIG with wire feeder (GMAW), Flux-cored (FCAW), DC TIG (GTAW), RMD and Pulsed MIG on ArcReach models, Air carbon arc cutting and gouging (CAC-A)
Miller Stick / Engine-Drive Support
Big Blue 400 Pro
Heavy-industrial diesel engine-driven welder with 400-amp output, ArcReach options, RMD/Pulsed MIG capability on ArcReach models, and 10,000-watt continuous auxiliary power.
Stick (SMAW)MIG with wire feeder (GMAW)Flux-cored (FCAW)DC TIG (GTAW)RMD and Pulsed MIG on ArcReach modelsAir carbon arc cutting and gouging (CAC-A)
Heavy industrial diesel engine-drive
Welding range
CC Stick/TIG: 20 - 400 A. CV MIG/FCAW: 14 - 40 V.
Engine
Kubota V1505 or Mitsubishi S4L2 diesel depending on stock number
Auxiliary power
Single-phase. Peak: 12,000 W. Continuous: 10,000 W.
Weight
Kubota: 950 lb. (431 kg). Mitsubishi: 993 lb. (450 kg).
Class
Heavy industrial diesel engine-drive
Machine Packages
| Stock number | Catalog package |
|---|---|
| 907732 | Kubota |
| 907732001 | Kubota with ArcReach |
| 907732013 | Kubota with ArcReach and WIC |
| 951744 | Kubota with ArcReach trailer package |
| 907733 | Mitsubishi |
| 907733001 | Mitsubishi with ArcReach |
Compatible Accessories
Protective Cover
195301 Protective cover for Big Blue 400 Pro, Big Blue 400 PipePro, and Big Blue 450 Duo CST.
Support path pendingCompatible Torches / Guns / Feeders
SuitCase Feeders
Voltage-sensing SuitCase or wire-feeder path listed for supported engine-drive machines.
Open support pageArcReach Smart Feeder
Smart Feeder path for ArcReach-equipped models where catalog-listed.
Open support pageMiller Catalog Accessories
These accessories are placed here only when the Miller catalog names this machine, torch, feeder, or family path. Verify plug style, voltage, package, and serial-specific details before ordering.
| Part | Accessory | Catalog fitment | Source / path |
|---|---|---|---|
| 951850 | Remote Output Panel Kit | For Big Blue models except Big Blue 450 Duo CST. | Catalog p. 124 Open support path |
| 300517 | Full KVA Adapter Cord | For Bobcat, Trailblazer, and Big Blue; adapts 120/240 V plug to common Millermatic and Spectrum 240 V plug. | Catalog p. 124 Open support path |
| 119172 | Full KVA Plug Kit | Single-phase 120/240 V 50 A plug kit for Bobcat, Trailblazer, and Big Blue. | Catalog p. 124 Open support path |
| 301438 | HWY-Mid Frame Trailer | For Bobcat, Trailblazer, Big Blue 400 Pro, Big Blue 400 PipePro, and Big Blue 450 Duo CST. | Catalog p. 125 Open support path |
| 301338 | HWY-225 Trailer | For Big Blue models. | Catalog p. 125 Open support path |
Full machine details
Welding Output
- 300 A at 32 V, 100% duty cycle
- 350 A at 27 V, 100% duty cycle
- 400 A at 24 V, 100% duty cycle
Key Support Notes
- ArcReach factory option on select models
- Quiet operation
- USB software/log access
- Trailer package option
Dimensions
H: 32 in. / 37 in. to top of exhaust, W: 26.25 in., D: 56 in.
Source: Miller Electric 2026 Full-line Catalog, catalog page 86, literature ED/5.7. Machine and accessory relationships are source-backed catalog references. Amazon purchase links stay separate and only appear after independent product verification.