那么斷路器到底有什么作用呢？簡單說就是保護我們的用電安全，防止觸電事故。專業的相關定義中不但提到“正常電路”也提到“異常電路”，很明顯簡單理解就是斷路器能在無故障也能在一定故障條件下工作，保護用電線路。

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.

而斷路器的保護作用主要就是指“故障條件下”的工作情況，這里提到的“故障條件”具體是指電路出現過載或短路，當電路中出現過載或短路時，斷路器就是用來切斷電流的設備，相當于水龍頭，它控制的水流，而斷路器控制的是電流。

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.

斷路器家族產品種類繁多，微型斷路器與之對應的有框架斷路器，一般安裝在總配電箱稱為一級配電；塑殼斷路器，一般裝用分配電柜稱為二級配電。微型斷路器的應用非常廣泛，它通常裝在配電柜或開關箱用于三級配電。需要注意的是微型斷路器可以控制電源的主回路，也可以用于控制二次回路的通斷，方便我們控制和維修。

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.

拆開一個1P的開關，可以看到斷路器的內部結構，從上往下大家看到接線端子，雙金屬片及內部軟銅線，熱脫扣拉桿，動觸頭，靜觸頭，電磁脫扣器，手柄，頂桿，滅弧室。

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.

正常工作時隨著動靜觸頭的結合，電流從上接線端子，由與雙金屬貼近軟銅線連接到動觸頭，靜觸頭，電磁脫扣器在到下端接線端子到用電器。

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.

當短路時，大電流通過電磁脫扣器產生的磁力吸引頂桿，脫扣器頂動操作機構動作，開關瞬時跳閘。當過載時，電流變大，隨著時間增加發熱量加劇，雙金屬片受熱變形到一定程度推動機構動作。

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微型斷路器價格人員認為該設備接通、承載和分斷正常電路條件下的電流，能夠帶電開合閘。也能在故障電路(例如短路、過載)的情況下自動分斷故障電流的一種機械開關，具有電路保護功能。需要注意的是與微型斷路器外觀和使用相似的有隔離開關，和負荷隔離開關。

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.

它們和斷路器不同分別是：隔離開關不能帶電開合閘，沒有保護功能，類似于刀閘開關。負荷隔離開關能夠帶電開合閘，沒有保護功能。斷路器既能帶電開合閘，也有保護功能。雖然他們都能隔離電源，實際工作中要注意他們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.

微型斷路器的工作原理以及相關電路內容就講到這里了，此外選購時需要注意按照自己的實際情況來選擇適合的型號。更多問題就來網站www.xzthjc.com咨詢了解吧。

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.xzthjc.com Com.