As the premier supplier of power system components, Interpower has what you need to complete your projects, including power switches and voltage selectors.
Interpower offers the Double Pole Single Throw Switch in several different designs. The main reason for the DPST is for safety considerations in international markets. International wiring systems are generally non-electrically polarized. By using the DPST switch, the contacts will cut off power to both the line and neutral when flipped into the off position. Click on the link for switches for more details on the different kinds available.
Interpower also offers one Voltage Selector. It physically looks like the switches, but it is not designed to be switched under load. It has a Double Pole Double Throw switch and provides switching of the primary side of a split coil power input transformer between series (230V) and parallel (115V) configurations.