Vacuum circuit breakers have developed strongly in the field of medium voltage in China, with large output and many manufacturers, and are very popular with users. Medium-voltage vacuum circuit breakers have dominated the market, and there are three main reasons for this: First, the power sector promotes vacuum switches.

In 1992, the electric power department began to promote vacuum switches to users, and after more than 10 years of efforts, manufacturers have accumulated rich operating experience, and vacuum switches are favored by users; Second, SF6 gas was designated as 6 restricted greenhouse gases by the Kyoto Protocol in 1997, although SF6 gas only contributes 0.1% to the greenhouse effect, but it is potentially dangerous, so it objectively promotes the development of vacuum circuit breakers; Third, the vacuum switch has been greatly developed in terms of performance and reliability, which can meet the different needs of various users, and develop a variety of special and multi-functional vacuum circuit breaker products for use

Households offer a lot of choice. At present, the column of the vacuum circuit breaker is transformed from air insulation--- composite insulation--- solid seal insulation.

The implementation of a sealing process in the manufacture of interrupters not only improves the output, but also improves the quality. From the perspective of contact structure, the development from transverse magnetic field to longitudinal magnetic field is greatly conducive to the improvement of breaking performance. The vacuum circuit breaker has also changed greatly in terms of function, from a single opening function to a multi-function such as breaking, isolation, and grounding.

According to statistics, among the 40.5KV circuit breakers in China, vacuum circuit breakers have accounted for 84.31%, and in the 12KV level, vacuum series has accounted for 99.39%. In 2009, China produced a total of 464,190 12KV vacuum circuit breakers, an increase of 82,067 units compared with 382123 in 2008, with a growth rate of 21.48%, especially in the 12KV class growth fast, such as 238344 vacuum series output in 2004, and in 2009 compared with 2004, an increase of 225846 units, almost doubled in 5 years. There are a total of 148 manufacturers of 12KV vacuum circuit breakers in China.

In modern society, various mechatronics technologies and vacuum treatment technologies are applied to the design and production of vacuum circuit breaker products, and the application and operation of vacuum circuit breakers have reached a better state. Since the beginning of the development of the vacuum circuit breaker industry, its development trend has been more and more in the direction of modernization, the degree of automation of vacuum circuit breaker equipment has been continuously enhanced, and the systematic connection of the equipment has made the product performance to achieve the state. In the follow-up vacuum circuit breaker product research and development and industrial development, the vacuum circuit breaker industry should be good at constantly creating its own core competitiveness in order to achieve greater development and progress.

The progress of technology and the innovation of the process have made the mechanical and electrical integration of the vacuum circuit breaker more enhanced, and the development trend of diversity has made the process control more simple and feasible, so the performance of the vacuum circuit breaker has been improved, the design has been improved, and the design form has become more reasonable and perfect, and the systematic progress of the vacuum circuit breaker equipment and even the entire vacuum circuit breaker industry has played a powerful role, and the core competitiveness, creativity and centripetal force of the vacuum circuit breaker industry have been enhanced. In the new development period, the core competitiveness of the vacuum circuit breaker industry has an obvious role and progressive significance for its future development and breakthrough.

The innovation and application of new technologies have made it possible to establish a vacuum circuit breaker R&D and production system integrating comprehensive automation and functional diversification, and various advantages and characteristics have been increasingly demonstrated, and the market competitiveness has been improved, thus showing the specific advantages of the vacuum circuit breaker industry. The reform and progress of technology, technological innovation and development have given birth to a variety of models of vacuum circuit breakers with characteristics, and their influence is cumulative and far-reaching.