Please I need help with schematics and explanation on how to turn off a generator automatically using a relay. Also, how to switch from the generator to the mains power from the grid

 

Google transfer switch to see how to safely connect a generator. Post questions if you have some.

 

@ tracecom, I will appreciate a detailed explanation to what you said. what I saw on google is the db to use not detailed explanation

 

The V/I of Generator?
How about the AC power source ?
What do you like to do for the generator automatically ON or OFF?