ZHENHUA.ZHENHUA is located in Guiyang High-tech Zone, covering an area of 38,000 square meters, with more than 700 employees (including more than 300 technicians), is a professional enterprise of vacuum devices established in 1966 by the former Ministry of Four Machines. After more than 50 years of development, the company has the core technology of passive electric vacuum devices, circuit breakers and other products, with more than 90 patents (more than 40 invention patents), and Yuguang brand vacuum interrupters as the core products, covering the voltage level of 0.38kV~126kV, which are widely used in the fields of power grids, rail transportation, nuclear power, etc., and are exported to the U.S.A., Germany, Japan and other countries.