I think, you have 1 black 1 white and 1 green wires.
But not certain,
Usual european colour code, White and black, are the live wires, green is ground. BUT why do you have 3.
An on/off switch would only have 2, Unless, you have one connection to the frame of the switch, which should be ground/earth.
You may need to repost this, with better wording.
SD
January 2012
I can answer this question...
How do I rewire the ON/OFF switch on a ORECK XL-9100?