高压真空断路器是指能够关合、承载和开断正常回路条件下的电流并能关合、在规定的时间内承载和开断异常回路条件下的电流的开关装置。高压真空断路器按其使用范围分为高压高压真空断路器与低压高压真空断路器，高低压界线划分比较模糊，一般将3kV以上的称为高压电器。
High voltage vacuum circuit breaker is a switchgear which can turn on, load and disconnect the current under normal loop condition and turn it off, and load and disconnect the current in the abnormal loop within a specified time. High voltage vacuum circuit breaker is divided into high-voltage vacuum circuit breaker and low voltage high voltage vacuum circuit breaker according to its scope of application. The division of high and low voltage boundary is fuzzy. Generally speaking, more than 3kV is called high-voltage electrical apparatus.
高压真空断路器可用来分配电能，不频繁地启动异步电动机，对电源线路及电动机等实行保护，当它们发生严重的过载或者短路及欠压等故障时能自动切断电路，其功能相当于熔断器式开关与过欠热继电器等的组合。而且在分断故障电流后一般不需要变更零部件。目前，已获得了广泛的应用。
High voltage vacuum circuit breaker can be used to distribute electricity, not frequently start asynchronous motors, the protection of the power line and a motor, can automatically cut off the circuit when they occur serious overload or short circuit and under voltage fault combination, its function is equivalent to the fuse switch and less thermal relay etc.. And there is no need to change the parts after the fault current is broken. At present, a wide range of applications have been obtained.