278884 - Miller IGBT Heat Sink Assembly Replacement

Restore Your Welder's Performance

Is your Miller welder overheating or shutting down prematurely? The issue might lie in the cooling system. The Miller 278884 Heat Sink Assembly is the genuine replacement part needed to keep your machine's power modules cool and functioning correctly. This assembly is responsible for drawing heat away from the IGBTs—the "muscles" of your inverter welder. When these components get too hot, the machine will trigger thermal protection modes or, worse, the components will burn out, leading to costly repairs.

Welding environments are tough. Dust, grinding swarf, and shop debris can accumulate on heat sink fins over time, acting like an insulating blanket that traps heat. While cleaning is often sufficient, physical damage to the fins or corrosion can permanently reduce the efficiency of the heat sink. If you are replacing blown IGBTs, it is often best practice to inspect the heat sink surface for pitting or warping and replace it if necessary to ensure the new modules have a perfect surface for heat transfer. This OEM part guarantees a perfect fit inside your Miller machine, lining up correctly with mounting points and airflow channels.

Don't risk your welder's reliability with makeshift cooling solutions. Using the correct Miller 278884 Heat Sink Assembly ensures that your equipment meets its factory specifications for duty cycle and output. Whether you are performing a routine overhaul or an emergency repair, installing genuine Miller parts is the best way to protect your investment and minimize downtime. Please verify compatibility with your specific machine's serial number before ordering to ensure this is the correct assembly for your model.