Miller Maxstar 280 DX TIGRunner DC TIG Welder, Coolmate 1.3, Cart, 208-575V
The Miller Maxstar 280 DX TIGRunner is a DC TIG welder package that mounts the deluxe Maxstar 280 DX TIG/stick inverter on a Small Runner Cart with a Coolmate 1.3 cooler. The DX adds pulser functions, preflow, full trigger options and extended sequencer ranges, and Auto-Line input accepts single- or three-phase power from 208 to 575 V.
The package holds the Maxstar 280 DX, the Coolmate 1.3, the Small Runner Cart, an 8 ft (2.4 m) primary cord, an adjustable shoulder strap and two 50 mm Dinse-style connectors; TIG torch accessories and coolant are not included with the TIGRunner. Output reaches 280 A with a 60 VDC open-circuit voltage, and the machine welds steel from 0.004 in. (0.1 mm) to 3/8 in. (9.5 mm). Being DC TIG (GTAW) only, it will not TIG weld aluminum.
QuietPulse lowers noise during DC pulse welding, Pro-Set handles presets, a sleep timer shuts the machine down when idle, and meter calibration supports certification. Stick (SMAW) features include dual schedules, DIG, adaptive Hot Start and Stick-Stuck, Auto-Postflow is built in, and Low OCV Stick keeps idle open-circuit voltage to 9-14 VDC. The Maxstar 280 power source itself weighs 47 lbs and has dual carry handles.
Highlights
Coolmate 1.3 and Small Runner Cart; cart is standard on this version
DX features: pulser, preflow, full trigger options, extended sequencer ranges
Amperage range 1-280 A; steel from 0.004 in. to 3/8 in. thick
Auto-Line input: 1- and 3-phase, 208-575 V, 50/60 Hz
TIG torch accessories and coolant are not included
DC only: no aluminum TIG welding
Specifications
Brand | Miller |
Manufacturer part number | 907539001 |
Processes | DC TIG (GTAW-DC), Stick (SMAW), air carbon arc (CAC-A) |
Amperage range | 1-280 A |
Input power | 1- and 3-phase, 50/60 Hz (Auto-Line) |
Input voltages | 208 V; 220/230/240 V; 380/400 V; 460/480 V; 575 V |
Max open-circuit voltage | 60 VDC |
Stick idle voltage | 9-14 VDC (Low OCV Stick) |
Material thickness | Steel 0.004 in. (0.1 mm) to 3/8 in. (9.5 mm) |
Weldable metals | Stainless steel, steel, specialty metals |
Cooler | Coolmate 1.3 |
Cart | Small Runner Cart (standard) |
Weight (Maxstar 280 only) | 47 lbs |
What's in the box
Maxstar 280 DX
8 ft (2.4 m) primary cord
Adjustable shoulder strap
Two 50 mm Dinse-style connectors
Coolmate 1.3
Small Runner Cart
Good to know
Check the input power (voltage, phase and amperage) against your supply before you order.


