When the coil is energized, the static iron core generates electromagnetic attraction to attract the moving iron core. Since the contact system is linked with the moving iron core, the moving iron core drives the three moving contact pieces to move at the same time, the main contact is closed, the auxiliary normally closed contact mechanically connected to the main contact is disconnected, and the auxiliary normally open contact is closed, thereby connecting the power supply. When the coil is de-energized, the attraction 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 to the main contact is closed, and the auxiliary normally open contact is disconnected, thereby cutting off the power supply.

1: Generally, a three-phase contactor has a total of 8 points, three inputs, three outputs, and two control points. The output and input correspond to each other, which can be easily seen. If self-locking is to be added, it is also necessary to connect the wire from one terminal of the output point to the control point.

2: First of all, you should know the principle of the AC contactor. It uses an external power supply to add to the coil to generate an electromagnetic field. It is energized and attracted, and the contact point is disconnected after power is cut off. After knowing the principle, you should figure out the contacts of the external power supply, that is, the two contacts of the coil, which are generally at the bottom of the contactor and on each side. The other inputs and outputs are generally at the top, and you can tell 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 a self-locking control, just sort out the circuit according to the principle.

The ABB AC contactor has a large carrying current. Generally, the internal pull-in coil controls its action or not, and the control coil is operated by various types of relays connected in series with it. The reason why it trips after thunder is because the relay of the ABB AC contactor has overcurrent or grounding protection function. When there is lightning on the line, it will control the AC contactor to act and cut off the load power supply to protect the equipment from being damaged by high voltage, high current or grounding.

When purchasing ABB AC contactors, choose a regular and trustworthy merchant. KeChuang Online is a domestic professional industrial control product online mall with many years of industry experience. It is not only an authorized agent for ABB AC contactor series products, but also provides customers with professional technical consulting services. It always serves customers before, during and after sales. What you buy is not only the product, but also a reliable guarantee in production work!