Water-cooled power feedthroughs are often used in applications where high temperatures necessitate cooling. This includes high-amperage applications where the cooling allows more amperage to be pushed through the conductor without raising temperatures past specs.

The typical applications is the connection terminals of vacuum furnaces and heaters. There are also high-frequency coils that enter and exit water. Generally, they are low-voltage and high-current, and a small part of them are high-voltage. Because the current passing through is relatively large, it is concerned that the temperature generated by the current will be too high. Therefore, internal water is generally used for heat dissipation. The diameter of the existing electrode conductive rod is 12mm (200A), 16mm (350A), 20mm (500A), 30mm (1000A).