断路器主要的作用有两个方面
There are two main functions of circuit breaker
（1）控制作用。即根据运行需要，投入或切除部分电力设备或线路。
(1) control function. That is, according to the operation needs, put in or cut off some electric equipment or lines.
（2）保护作用。即在电力设备或线路发生故障时，通过继电保护及自动装置作用于断路器，将故障部分从电网中迅速切除，以保证电网非故障部分的正常运行。
(2) protection. That is to say, in case of power equipment or line failure, through relay protection and automatic device acting on the circuit breaker, the fault part will be quickly removed from the grid to ensure the normal operation of the non fault part of the grid.
高压断路器
High voltage circuit breaker
1.正常情况下接通和断开高压电路中的空载及负荷电流。
1. Under normal conditions, connect and disconnect no-load and load current in high-voltage circuit.
2.在系统发生故障时能与保护装置和自动装置相配合，迅速切断故障电流，防止事故扩大，从而保证系统安全运行。
2. In case of system failure, it can cooperate with the protection device and automatic device to cut off the fault current quickly to prevent the accident from expanding, so as to ensure the safe operation of the system.