Medium voltage circuit breaker: the rated voltage of the medium voltage circuit breaker is between 0-7.2kv. It can be assembled into a metal finished indoor closed switchgear line by 1, and individual substations can also be installed outdoors. The air circuit breaker replaces the indoor application oil filling of the breaking unit, but now it has replaced the vacuum circuit breaker (about 35 kV). Like the high-voltage circuit breaker, it also protects the current sensing relay by operating the current transformer. The characteristics of medium voltage circuit breakers are through international standards, such as IEC 62271. Medium voltage circuit breakers almost always use different sensors and current protection relays instead of relying on built-in thermal overcurrent or magnetic field sensors.

中压断路器，按扑灭电弧的介质可分为：

Medium voltage circuit breaker can be divided into:

真空断路器，额定电流至3000A，这些断路器电流中断的容器创建和真空电弧熄灭的研究。这是普遍适用的电压高达约35,000A， 对应的范围大致电力系统中电压。 真空断路器之间往往有预期寿命比较大的空气断路器。

Vacuum circuit breakers, rated current up to 3000A, these circuit breakers create containers with current interruption and study the extinction of vacuum arc. This is generally applicable to voltages up to about 35000a, corresponding to roughly the range of voltages in the power system. There are often air circuit breakers with long life expectancy between vacuum circuit breakers.

空气断路器，额定电流至10,000A,特征往往是完全可调行程包括可配置的阈值和延误。通常通过电子控制，虽然有些型号的微处理器控制单元通过一个完整的电子流程。 通常用于易于维护的地方，主要分布在大型工业厂房。

Air circuit breakers, rated to 10000 a, are often characterized by fully adjustable travel, including configurable thresholds and delays. Usually through electronic control, although some models of microprocessor control units through a complete electronic process. It is usually used in places easy to maintain, mainly distributed in large industrial plants.

六氟化硫断路器气体灭火用硫磺充满弧一室。

Sulfur hexafluoride circuit breaker gas fire extinguishing fills the arc chamber with sulfur.

中压断路器，可连接到电路由螺栓连接母线或电线，尤其是在户外。在开关线制成品中压断路器在构建时常常抽出建设，使断路器被删除，而不会干扰主电路连接，采用电动操作或手摇机制，以脱离其外壳断路器。

Medium voltage circuit breakers can be connected to the circuit by bolted bus bars or wires, especially outdoors. During the construction of the medium voltage circuit breaker of the finished switch line, the construction is often pulled out, so that the circuit breaker can be deleted without disturbing the connection of the main circuit. The electric operation or manual mechanism is adopted to separate the circuit breaker from its shell.

高压断路器：电气输电网络得到定义高电压不一，但在动力传输工作通常被认为是72.5KV或更高，根据最近的定义由一个国际电工委员会（IEC）的。 高压断路器的人几乎都是电磁式，与电流感应保护继电器通过操作变电站的继电保护计划可能会很复杂，保护接地故障类型的设备和公共汽车超载或地面不同。

High voltage circuit breaker: electrical transmission network is defined as high voltage, but in power transmission work, it is usually considered to be 72.5kV or higher, according to the recent definition by an International Electrotechnical Commission (IEC). The people of high-voltage circuit breakers are almost electromagnetic, and the relay protection plan through the operation of current sensing protection relay in the substation may be very complex. The equipment of protective grounding fault type is different from that of bus overload or ground.