acmotorsymbol [~]wiring
I was wondering what is the role/purpose of the electric component in the red square.
This is the schematic of a 230V single phase induction motor.
What is also not clear to me are the connections on the right side.
The first two wires are neutral (blue) and live (brown). What is the third one? Earth? If yes, why is there an tild sign (AC) above it?
Pictures should help:
As @Asmyldof stated, the motor has no concept of hot or neutral, so the polarity of the AC connections is not important. Connect one of them to hot, and one of them to neutral. The motor will turn the same direction even if you reverse these connections. To reverse the motor, you have to remove the metal jumpers, and reposition them as indicated by the diagram.
Note that you absolutely should ground the motor housing, but this is a protective measure (the yellow/green-stripe wire is the earth/ground connection), but ground is not neutral.
Connect to terminals 1 and 2 (or 3) as instructed by the product documentation. Carefully connect an earth wire to the motor housing with one of the screws that attach the terminal block to the housing. You could also connect the earth wire using one of the holes in the housing used to mount the motor. If you do that, remove the paint where contact is made.
Best Answer
This component is a undervoltage protection device. When the voltage is high enough the device will close a make contact so current can flow. When the voltage is to low the contact will open or stay open. This is a over voltage-relay, but imagine it with the smaller than(<) character.
Link to image