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Question:

What is the effect of the open contact of the AC contactor and the pushbutton switch?

What is the effect of the open contact of the AC contactor and the pushbutton switch?

Answer:

When the start button is pressed, the contactor coil is energized. When released, the contactor coil is de-energized and disconnected
Loosen the start button, although the button is disconnected from the coil, the coil is still passed through the auxiliary contact Control line connected, still have electric pull.
Press the start button, the coil is energized, and the auxiliary contact is sucked together. The coil also communicates with the control line through the auxiliary contact.
Long connection, that is, on the basis of the jog, stop the button on the back and then connect a line to the contactor normally open the end of the auxiliary contact, the other end of the auxiliary contact connected to the coil contacts, This contact is connected to the start button

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