I have seen one X10 Compatible heavy duty
switch that can do 220 Volts at 30 amps
switchine both hot leads or two individual
120 volt 30 amp one from each phase as it is
wired to both phases. It also acts like a
repeater/coupler. Now it is NOT cheap around
$130. ELK-9100
www.elkproducts.com Smarthome
www.smarthome.com/1289.html Automatedoutlet.com also lists it and I
would guess other automation dealers.
You can get a copy of the users manual for
it on the elk site or the Smarthome web page.