There are actually 2 switches for 220/240, both are from X10Pro.
There is a XPS2 for pumps, blowers and other higher voltage devices and also the XPR2 which is a 240V@20A Receptacle Module.
Get the X10Pro Design Manual which has all these answers. Call 800-411-2888 for X10Pro sales and 800-832-4003 for support questions. John is a top notch expert.