3 phase contactor

Three-phase power supply is connected with the AC contactor three main contact, also three main contacts connected with the motor, AC contactor coil is connected with the control circuit and controlled by buttons of AC contactor suction can be.
A: the general three-phase contactor, a total of 8 points, three road input, three output, there are two control points. Output and input, it is easy to see. If you want to add a self – lock, then you need to be from the output point of a terminal line to the control point.
Two: first, the principle of this single AC contactor. It uses external power to add on the line to produce an electromagnetic field. And pull power, power point of contact is disconnected. You should be aware of the principle of the external power supply, it is the two of the coils, the general in the lower part of the contactor, and on one side. Other several road input and output in the upper part, a look at the. Also pay attention to the number of external power supply (220V or 380V), the general subject of. And note that the contact point is often closed or open. If there is a self – lock control, according to the principle of the line on the line.