After a research on MOSFET use, I've found that I'm unable to connect load on Source in N-type without additional consideration.
About this component CPC1002N http://www.ixysic.com/home/pdfs.nsf/www/CPC1002N.pdf/$file/CPC1002N.pdf
I've a MOSFET driven by a LED, N-Type. This component is described as Relay, in this case should I take in consideration that load still need be on Drain becouse there's MOSFET inside? Or can I put load where I prefer since Vgs is given by an optocoupler?