138695 - Miller 0.01 µF 1000 VDC Ceramic Disc Capacitor

Reliable Circuit Protection with the Miller 138695 Capacitor

The Miller 138695 Capacitor is a specialized electronic component designed to meet the rigorous demands of industrial welding equipment. As a ceramic disc capacitor, it offers a robust solution for circuit stabilization, noise filtering, and voltage management within Miller power sources. Rated at 0.01 µF (microfarads) and capable of handling up to 1000 VDC, this component is engineered to withstand the high-voltage spikes and electromagnetic interference often generated during the welding process. Using genuine OEM parts like this capacitor is critical for maintaining the factory specifications of your machine and ensuring safe, reliable operation.

Technical Significance in Welding Machines

Capacitors play a vital role in the internal electronics of a welder. In high-frequency start circuits, inverters, and control boards, a capacitor with a 1000 VDC rating is often used to suppress transient voltages that could otherwise damage sensitive logic components. The ceramic disc construction provides low parasitic inductance, making it excellent for high-frequency applications. If a capacitor in your welder fails—often indicated by a burnt appearance, a crack in the ceramic casing, or simply an open circuit—it can lead to erratic arc performance, failure to initiate an arc, or complete board failure. Replacing it with the exact Miller-specified part ensures that the dielectric strength and temperature coefficients match the original design requirements.

Installation and Compatibility

This unit comes with pre-formed terminals ("w/Terms") designed to fit specific footprints on Miller printed circuit boards (PCBs). While generic capacitors exist, they often lack the precise lead spacing or the specific voltage endurance required for the harsh electrical environment of a welding shop. The Miller 138695 is verified for fitment across various Miller equipment models. When installing, it is crucial to observe standard safety protocols for handling high-voltage electronics, including discharging capacitors before removal to prevent electric shock. By choosing this authentic Miller replacement part, maintenance professionals can confidently repair equipment and minimize downtime.