Need new switch for Shopvac QSP Pro 10 gallon unit

I just went through the same problem with a Shop Vac. The switch is easy to replace but not easy to find. After removing the switch, I found a match made by Sigma Switches. They directed me to contact a local RV dealer and look in either their Coast Supply or Stag/Parkway Supply catalogs for the appropriate switch (an H2-28 in my case for a QPL45 Shop Vac). After ordering the switch and $5 later, it snaps in like the original with no problems. Certainly beats $70 for a whole new motor assembly.

You'll need the model number for your vacuum (on the tag) to find the parts list for your unit.   Here's a link:http://www.shopvac.com/parts_pdfs.asp?p=%25&Submit=Search
Also, in correspondence with Shop-Vac, they do not replace switches or motor parts due to liability concerns.  They will sell you a new motor assembly, though.  I hope this helps.

I to am on the list of people that have experienced the Shop Vac switch delema,but have made an intresting discovery while trying to get to the bottom of this.
I had the vac apart and found a break in a wire were the switch wires attach to the windings in the motor.It seems that the torque from the motor starting.After finding it in my 18 gal vac I checked another that has been collecting dust for a couple years and it had exactly the same problem.Since Shop Vac just replaces the whole power head,we have all believed that the switches were the problem,and in mine this was not the case.
Hope this is helpful>>>>>>>>