Chief, you are looking for one of these.... http://www.asco.com/cgi-bin/redirect.pl?/product.html

I am afraid to think of what could go wrong in the possible reconnection of the POCO and your generator due to relay contacting at the wrong time. Unless you have a fool proof make before break circuit, I would not want the liability. Also what will you be doing with the neutrals?

Mark Heller
"Well - I oughta....." -Jackie Gleason