I don't own a TS8000. A general answer is that a paper shredder On-Off switch is a "double-pole, single throw". The switch cut off the "hot and neutral" circuit from the power source.
Try Radio Shack for the switch
Clem, August 2009
edit
I can answer this question...
Where can I buy a new switch for Techsolutions paper shredder Model TS 8000?