Quote Originally Posted by Noplace View Post
Sorry what I meant is, why do we need to use the contactor switch instead of just direct connection to power source, is it the same purpose as having a mechanical switch for example? can I just use a disconnect switch and be done with it?

I definitely will get one but all I find is ones controlled with AC voltage, I read that I can make them work with DC though
Well why bother with the Pilz relay or any of the safety stuff if your taking this approach just wire everything together direct and be done with it and keep your hand on the plug.!!! . . . . Now the fact your asking why for such an obvious concept worry's me slightly so maybe you should be asking if your upto to doing this without help from someone more electricly minded.?

AC contactors will work ok because again there coils pull relatively little current so the Pilz Relay contacts are not under heavy loads. It's just prefered to keep low voltage for safety and simplicity reasons.