High voltage relay is designed to transfer power for high voltage and high frequency applications. These are heavily insulated. It consists of strong materials to increase contact life. High voltage relays use several isolation methods to achieve high dielectric strength. It requires an analysis of performance ratings, coil ratings, and mounting styles. It is used in aerospace and military equipment such as high frequency antenna couplers, multi-mode radar, laser rangefinders, space and satellite applications, and lightning protection.