Canadian owned and operated
The Miller 272789 is a specialized replacement kit designed for the repair of the AF40i (AirForce 40i) and potentially related inverter-based power sources within the ITW family (Miller/Hobart). This kit contains the primary Circuit Card Assembly mated to the essential Wind Tunnel Heatsink (H/S). This integration is vital for the machine's operation, as the heatsink serves as both the thermal dissipation path for the power transistors and the structural mounting point for the board within the machine's airflow channel.
Diagnosing a faulty main board can be frustrating, but replacing it with the correct assembly shouldn't be. This kit is the exact replacement part specified in the service manuals for the AF40i. It is engineered to handle the high-frequency switching and current regulation required for plasma cutting and welding operations. The board controls the output characteristics, ensuring a stable arc and precise control over amperage. If your machine has suffered a catastrophic board failure due to power surges, overheating, or age, this assembly is the direct solution.
One of the standout features of this assembly is the implementation of Wind Tunnel Technology. In this design, the heatsink is positioned in a dedicated airflow tunnel. The circuit board itself is mounted in a way that minimizes its exposure to the high-velocity air stream, which often carries conductive grinding dust and contaminants. By replacing the assembly as a complete unit (Board + Heatsink), you ensure that the thermal paste interface and mechanical mounting are factory-perfect, preventing future overheating issues that could occur if you attempted to replace components individually.
Key Benefits of the 272789 Kit:
| Additional Information |
|---|
| Brand:Miller |
| Packaging Description:1-per-ea |
| Product Type:Circuit Card Assembly |
| Compatibility:AirForce 40i, Spectrum Series |
| Component Type:Inverter Board, Heatsink Assembly |
| Technology:Wind Tunnel Technology |
$350 Rebate
