hi guys pls i need asistance in construction of ATS including the circuit diagram and the procedure because i dont have the knowledge of it.

 

There is more than one kind of them - http://en.wikipedia.org/wiki/Transfer_switch

 

Tell us a little bit about your application. Is is to transfer power from primary to backup (like batteries)?

It is one of my shelved projects, but few months ago I've gotten a really neat idea on how to do it. Tell us what you want to accomplish.