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.

交流接触器工作原理

Working principle of AC contactor

当线圈通电时,静铁芯产生电磁吸力,将动铁芯吸合,由于触头系统是与动铁芯联动的,因此动铁芯带动三条动触片同时动作,主触点闭合,和主触点机械相连的辅助常闭触点断开，辅助常开触点闭合，从而接通电源。当线圈断电时,吸力消失, 动铁芯联动部分依靠弹簧的反作用力而分离,使主触头断开,和主触点机械相连的辅助常闭触点闭合，辅助常开触点断开，从而切断电源。

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.

一:一般三相接触器一共有8个点，三路输入，三路输出，还有是控制点两个。输出和输入是对应的，很容易能看出来。如果要加自锁的话，则还需要从输出点的一个端子将线接到控制点上面。

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: 应该知道交流接触器的原理。他是用外界电源来加在线圈上，产生电磁场。加电吸合，断电后接触点就断开。知道原理后，你应该弄清楚外加电源的接点，也就是线圈的两个接点，一般在接触器的下部，并且各在一边。其他的几路输入和输出一般在上部，一看就知道。还要注意外加电源的电压是多少（220V或 380V），一般都标得有。并且注意接触点是常闭还是常开。如果有自锁控制，根据原理理一下线路就可以了。

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.

交流接触器的承载电流很大，一般是内部的吸合线圈来控制它的动作与否，而控制线圈又由与它串接的各种类型的继电器来操作，打雷之后会跳闸的是因为ABB交流接触器的继电器带有过流或接地保护功能，当线路上落有雷电，它会控制交流接触器动作，切断负荷电源，来保护设备，以免被高电压，大电流损坏或是接地发生危险

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.jntongyu.com