Thanks for your swift reply. I did originally think of using an Arduino relay shield, but as I´m using a screw shield plus a Wifi shield, the addition relay sield seemed a bit too much.
I´m using din rail relay sockets for the auxillary relays. I think I have ust found a suitable solid state relay that might solve all my "problems". The SSL pulls only 10mA so maybe the problems solved (just need to make certain).