Common AC contactor connections are:
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One: The general three-phase contactor has a total of 8 points, three inputs, three outputs, and two control points. The output and input are corresponding and can be easily seen. If you want to add a lock, you need to connect the line from the terminal of the output point to the control point.
Second: First of all, you should know the principle of the AC contactor. He uses an external power source to apply to the coil to generate an electromagnetic field. After the power is applied, the contact point is disconnected after the power is turned off. Knowing the principle, you should figure out the contact point of the external power supply, that is, the two contacts of the coil, generally in the lower part of the contactor, and on each side. The other few inputs and outputs are generally in the upper part and are known at a glance. Also pay attention to the voltage of the external power supply (220V or 380V), which is generally marked. Also note that the contact point is normally closed or normally open. If there is self-locking control, the line can be based on the principle.
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