那么断路器到底有什么作用呢？简单说就是保护我们的用电安全，防止触电事故。专业的相关定义中不但提到“正常电路”也提到“异常电路”，很明显简单理解就是断路器能在无故障也能在一定故障条件下工作，保护用电线路。

So what is the function of the circuit breaker? In short, it is to protect our electricity safety and prevent electric shock accidents. In the relevant professional definitions, not only "normal circuit" but also "abnormal circuit" are mentioned. It is obvious that the simple understanding is that the circuit breaker can work under certain fault conditions without fault to protect the power line.

而断路器的保护作用主要就是指“故障条件下”的工作情况，这里提到的“故障条件”具体是指电路出现过载或短路，当电路中出现过载或短路时，断路器就是用来切断电流的设备，相当于水龙头，它控制的水流，而断路器控制的是电流。

The protection function of the circuit breaker mainly refers to the working condition under the "fault condition". The "fault condition" mentioned here specifically refers to the overload or short circuit of the circuit. When the overload or short circuit occurs in the circuit, the circuit breaker is the equipment used to cut off the current, which is equivalent to the water dragon head. It controls the water flow, while the circuit breaker controls the current.

断路器家族产品种类繁多，微型断路器与之对应的有框架断路器，一般安装在总配电箱称为一级配电；塑壳断路器，一般装用分配电柜称为二级配电。微型断路器的应用非常广泛，它通常装在配电柜或开关箱用于三级配电。需要注意的是微型断路器可以控制电源的主回路，也可以用于控制二次回路的通断，方便我们控制和维修。

There are many kinds of circuit breaker family products. The frame circuit breaker corresponding to the miniature circuit breaker is generally installed in the general distribution box, which is called primary distribution; Molded case circuit breaker is generally installed with distribution cabinet, which is called secondary distribution. Miniature circuit breaker is widely used. It is usually installed in distribution cabinet or switch box for three-level distribution. It should be noted that the miniature circuit breaker can control the main circuit of the power supply and can also be used to control the on-off of the secondary circuit, which is convenient for our control and maintenance.

拆开一个1P的开关，可以看到断路器的内部结构，从上往下大家看到接线端子，双金属片及内部软铜线，热脱扣拉杆，动触头，静触头，电磁脱扣器，手柄，顶杆，灭弧室。

Disassemble a 1p switch, you can see the internal structure of the circuit breaker. From top to bottom, you can see the wiring terminal, bimetallic sheet and internal soft copper wire, thermal trip pull rod, moving contact, static contact, electromagnetic release, handle, ejector rod and arc extinguishing chamber.

正常工作时随着动静触头的结合，电流从上接线端子，由与双金属贴近软铜线连接到动触头，静触头，电磁脱扣器在到下端接线端子到用电器。

During normal operation, with the combination of dynamic and static contacts, the current is connected from the upper wiring terminal to the moving contact, from the flexible copper wire close to the bimetal, from the static contact to the lower wiring terminal of the electromagnetic release to the electrical appliance.

当短路时，大电流通过电磁脱扣器产生的磁力吸引顶杆，脱扣器顶动操作机构动作，开关瞬时跳闸。当过载时，电流变大，随着时间增加发热量加剧，双金属片受热变形到一定程度推动机构动作。

In case of short circuit, the high current attracts the ejector rod through the magnetic force generated by the electromagnetic release, the ejector operating mechanism acts, and the switch trips instantaneously. In case of overload, the current becomes larger, and the calorific value intensifies with the increase of time. The bimetallic sheet is heated and deformed to a certain extent to promote the action of the mechanism.

ABB微型断路器价格人员认为该设备接通、承载和分断正常电路条件下的电流，能够带电开合闸。也能在故障电路(例如短路、过载)的情况下自动分断故障电流的一种机械开关，具有电路保护功能。需要注意的是与微型断路器外观和使用相似的有隔离开关，和负荷隔离开关。

The price personnel of ABB miniature circuit breaker believe that the equipment can connect, carry and disconnect the current under normal circuit conditions, and can be energized for opening and closing. It is also a mechanical switch that can automatically break the fault current under the condition of fault circuit (such as short circuit and overload), which has the function of circuit protection. It should be noted that there are disconnectors and load disconnectors similar to the appearance and use of miniature circuit breakers.

它们和断路器不同分别是：隔离开关不能带电开合闸，没有保护功能，类似于刀闸开关。负荷隔离开关能够带电开合闸，没有保护功能。断路器既能带电开合闸，也有保护功能。虽然他们都能隔离电源，实际工作中要注意他们的功能和使用有所不同。

They are different from the circuit breaker in that the disconnector cannot be opened and closed with electricity and has no protection function, which is similar to the knife switch. The load disconnector can be opened and closed with electricity, and has no protection function. The circuit breaker can not only open and close with electricity, but also have protection function. Although they can isolate the power supply, we should pay attention to their different functions and uses in practical work.

微型断路器的工作原理以及相关电路内容就讲到这里了，此外选购时需要注意按照自己的实际情况来选择适合的型号。更多问题就来网站www.jntongyu.com咨询了解吧。

That's all for the working principle and related circuit content of the miniature circuit breaker. In addition, when purchasing, you need to pay attention to selecting the appropriate model according to your actual situation. For more questions, please visit www.jntongyu.com Com.