Any kind of circuit breaker which deals with more than 72,500 volts of electricity is considered a high vacuum voltage breaker. These are found outdoors in chain-link enclosures along high-voltage power lines. All high voltage circuit breakers are operated by means of a solenoid which, when too much power runs through it, engages to fill the arc-chamber where the power is flowing with an inert material. The material varies. Be it gas, oil or something else, the point is that it stops the electricity from arcing from one contact to the next until the breaker can be reset.
Operating Mechanism
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