因其灭弧介质和灭弧后触头间隙的绝缘介质都是高真空而得名；其具有体积小、重量轻、适用于频繁操作、灭弧不用检修的优点，在配电网中应用较为普及。

Because of its arcing medium and arcing contact after clearance of the insulating medium is named high vacuum; It has small volume, light weight, suitable for frequent operation, arcing without maintenance, the advantages of application of common in the distribution network.

真空断路器是3～10kV，50Hz三相交流系统中的户内配电装置，可供工矿企业、发电厂、变电站中作为电器设备的保护和控制之用，特别适用于要求无油化、少检修及频繁操作的使用场所，断路器可配置在中置柜、双层柜、固定柜中作为控制和保护高压电气设备用。

Vacuum circuit breaker is 3 ~ 10 kv, 50 hz three-phase ac indoor distribution equipment in the system and is available for industrial and mining enterprises, power plants and substations as protection and control of electrical equipment, especially suitable for the requirements without oil, less maintenance and the use of frequent operation, circuit breaker can be configured in the cupboard, double tank, fixed for control and protection of high voltage electrical equipment in the cupboard.

1）工作原理是： 当动、静触头在操作机构的作用下分闸时，触头间产生电弧，触头表面在高温下挥发出蒸汽，由于触头设计为特殊形状，在电流通过时产生一磁场，电弧在此磁场作 用下沿触头表面切线方向快速运动，在金属圆筒(屏蔽罩)上凝结了部分金属蒸汽，电弧在自然过零时就熄灭了，触头间的介质强度又迅速恢复起来。

1) working principle is: when the dynamic and static contact in operating mechanism under the action of the brake, which arc contact contact surface evaporation at high temperature steam, due to the contact for special shape design, produced when an electric current passes through a magnetic field, arc in the magnetic field along the contact with the surface tangent to the quick and condensation on the metal cylinder (shield) some of the metal vapor, arc in natural zero is extinguished, contact between the dielectric strength and recover quickly.

2）真空断路器作用

2) vacuum circuit breaker

断路器具有过载、短路和欠电压保护功能，有保护线路和电源的能力。

Circuit breaker with overload, short circuit and low voltage protection function, has the ability to protect circuit and power supply.