Hi,
Going straight to the issue:
What is the voltages you've to deal with ?
What is the power range that has to be managed ? W ? Kw ? mW ?
Your switch has three positions ON(polarity+) ; OFF ; ON (polarity-) or ON(polarity+) ; ON (polarity-)
From your scheam is not clear what is "+", I mean: "+" is like a "+" from a battery " so if I connect a LED diode it will light up ?
Bye,
Alex.