"High-voltage vacuum circuit breakers" for its arc-quenching medium and arcing contacts space insulation medium is named after the high vacuum; vacuum circuit breaker with small size, light weight, suitable for frequent operation, the arc without overhauling the advantages of applying ubiquitous in distribution networks.
In 1893, reighton House proposes the simple structure of the vacuum interrupters, and received a design patent. In 1920, the Swedish company first made the vacuum switch. 1926, published research results also show the possibility of breaking the current in a vacuum, but because of low breaking capacity and limited by vacuums and vacuum levels of material development, it cannot be put into practical use. With the development of vacuum technology in the 50 United States only made its first grant for special requirements such as cut off capacitor vacuum switch, breaking current is stopped at the 4,000 level. Vacuum smelting technology of materials advances and vacuum switch contact made on the structure of the breakthrough, in 1961, started producing 15,000 volts, breaking current of vacuum circuit breaker for 12,500.
In 1966, manufactured into 15,000 volts, 26,000 and 31,500 a vacuum circuit breaker, so that the vacuum breaker into the high voltage, large capacity electric power system. The mid-80, breaking capacity of vacuum circuit breaker has reached 100,000. From 1958, China started to develop the vacuum switch, 1960 switching rectifier and Xian, Xian Jiaotong University jointly developed the first 6.7 kV, breaking capacity for 600 vacuum switch followed a 10,000-volt three-phase vacuum circuit breaker breaking capacity for 1500. Hua Guang electronic tube factory, 1969 and the Xian high voltage apparatus Research Institute made a 10,000-volt, 2000 a single rapid vacuum switch. After 70, China has independently developed and produced a variety of vacuum switch.
Vacuum circuit breaker can be classified more than one voltage level. Low pressure generally used for explosion-proof electrical use. Like coal mines, and so on.