Manufacturers of main components in high-voltage switchgear mainly include protective devices and vacuum circuit breakers. There are many models and brands of vacuum circuit breakers, such as VS 1 series. VD4 series, VB2, EV 12, etc. The best cost performance is VS 1, but the domestic market of VS 1 is very chaotic. This product has been completely marketized, the price is basically open, and the materials used are different. The main component of circuit breaker is vacuum interrupter, so it must be used well, otherwise it will lead to serious failure.
Don't buy permanent magnets, because the operating mechanism can reach 654.38+ 10,000 life. But vacuum tubes don't have that long life, so it's just a concept hype, and high pressure won't be operated many times.