Sealed Pole Market And Development

In 1997, ABB engineers in the UK and the US jointly developed a new type of VMI vacuum circuit breaker, which uses a magnetic drive mechanism consisting of only 66 parts (7 moving parts) instead of the traditional mechanism consisting of hundreds of parts. Its opening and closing positions are maintained by permanent magnets. This maintenance-free vacuum circuit breaker mechanism does not require maintenance during its 100,000 operating life, which is many times the life of traditional vacuum circuit breakers. In order to meet the requirements of long life and high reliability of VMI circuit breakers, ABB has developed a new generation of vacuum arc chamber with special miniaturization and long life, and has completely cast the vacuum arc chamber and upper and lower outlet connectors with epoxy resin, making the entire circuit breaker pole an integral component. Embedded Pole uses epoxy resin as the insulating medium, and the vacuum arc chamber and the upper and lower outlet terminals and other current-carrying components are completely sealed with epoxy resin, thereby achieving the best resistance and preventing external influences: at the same time, the volume of the switch cabinet used for the vacuum circuit breaker is greatly reduced.