High voltage dry reed relay is a kind of electrical switch, which is a relay made of dry switch technology. Its structure and working principle are similar to ordinary electromagnetic relay, but it uses dry switch technology, which uses magnetic field to open and close the reed, so as to realize the opening and closing of the circuit. Compared with ordinary relays, high-voltage reed relays have many advantages, such as high voltage capability, high insulation performance, long life, fast response, low noise, small size, light weight and so on. It is usually used in power system, such as high voltage switch, transformer protection and so on.