AC contactor is the most widely used low-voltage control appliance in electric drive and automatic control system. As an actuator, it is used to connect and disconnect lines, or frequently control the operation of motors and other equipment. It is composed of dynamic and static main contacts, arc extinguishing cover, dynamic and static iron core, auxiliary contacts, support shell, etc. After the electromagnetic coil is energized, the moving iron core is pulled in under the action of electromagnetic force, and the moving contact is contacted with the static contact directly or through lever transmission to connect the circuit. After the electromagnetic coil is powered off, the moving iron core automatically returns under the action of the return spring, commonly known as release, the contacts are separated and the circuit is broken. More than 90% of automatic control power systems use contactors, which shows how widely it is used.

交流接觸器工作原理

Working principle of AC contactor

當線圈通電時,靜鐵芯產生電磁吸力,將動鐵芯吸合,由于觸頭系統是與動鐵芯聯動的,因此動鐵芯帶動三條動觸片同時動作,主觸點閉合,和主觸點機械相連的輔助常閉觸點斷開，輔助常開觸點閉合，從而接通電源。當線圈斷電時,吸力消失, 動鐵芯聯動部分依靠彈簧的反作用力而分離,使主觸頭斷開,和主觸點機械相連的輔助常閉觸點閉合，輔助常開觸點斷開，從而切斷電源。

When the coil is energized, the static iron core generates electromagnetic suction to pull the moving iron core in. Because the contact system is linked with the moving iron core, the moving iron core drives three moving contacts to act at the same time, the main contact is closed, the auxiliary normally closed contact mechanically connected with the main contact is disconnected, and the auxiliary normally open contact is closed, so as to connect the power supply. When the coil is powered off, the suction disappears, and the linkage part of the moving iron core is separated by the reaction force of the spring, so that the main contact is disconnected, the auxiliary normally closed contact mechanically connected with the main contact is closed, and the auxiliary normally open contact is disconnected, so as to cut off the power supply.

一:一般三相接觸器一共有8個點，三路輸入，三路輸出，還有是控制點兩個。輸出和輸入是對應的，很容易能看出來。如果要加自鎖的話，則還需要從輸出點的一個端子將線接到控制點上面。

1： Generally, the three-phase contactor has a total of 8 points, three inputs, three outputs, and two control points. The output corresponds to the input, which is easy to see. If you want to add self-locking, you also need to connect the wire from a terminal of the output point to the control point.

二: 首先應該知道交流接觸器的原理。他是用外界電源來加在線圈上，產生電磁場。加電吸合，斷電后接觸點就斷開。知道原理后，你應該弄清楚外加電源的接點，也就是線圈的兩個接點，一般在接觸器的下部，并且各在一邊。其他的幾路輸入和輸出一般在上部，一看就知道。還要注意外加電源的電壓是多少（220V或 380V），一般都標得有。并且注意接觸點是常閉還是常開。如果有自鎖控制，根據原理理一下線路就可以了。

2： First of all, you should know the principle of AC contactor. He uses an external power source to add to the coil to generate an electromagnetic field. Power on and pull in, and the contact point will be disconnected after power failure. After knowing the principle, you should find out the contact of the external power supply, that is, the two contacts of the coil, which are generally at the lower part of the contactor and on each side. Other inputs and outputs are generally in the upper part, which can be seen at a glance. Also pay attention to the voltage of the external power supply (220V or 380V), which is generally marked. And pay attention to whether the contact point is normally closed or normally open. If there is self-locking control, just sort out the circuit according to the principle.

交流接觸器的承載電流很大，一般是內部的吸合線圈來控制它的動作與否，而控制線圈又由與它串接的各種類型的繼電器來操作，打雷之后會跳閘的是因為ABB交流接觸器的繼電器帶有過流或接地保護功能，當線路上落有雷電，它會控制交流接觸器動作，切斷負荷電源，來保護設備，以免被高電壓，大電流損壞或是接地發生安全危險

The bearing current of AC contactor is very large. Generally, the internal pull-in coil is used to control its action, and the control coil is operated by various types of relays connected in series with it. After lightning, it will trip because the relay of ABB AC contactor has overcurrent or grounding protection function. When lightning falls on the line, it will control the action of AC contactor, Cut off the load power supply to protect the equipment from safety hazards caused by high voltage, large current or grounding

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The above wonderful content comes from the introduction and sharing of ABB contactor agent of Jinan Tongyu electromechanical Co., Ltd. please continue to pay attention to us for more content: http://www.xzthjc.com