What is the correct way to wire the inbuilt thermal overload switch in an AC motor? I want to protect the motor in event of stall, but it should be safe, i.e. not start up automatically when motor cools down - in case some operator might get injured.
If I am thinking right you have a thermal protective device which is within the windings of your motor.
To stop the motor from starting automatically when motor has cooled you need to locate the terminations in the motor terminal box for the termal protctive device. When you have found them you put them in series with the stop circuit of the motor control circuit.