MLCS sells a 15 amp router table power switch that should be OK if your saw works on 110 volts. Try www.mlcswoodworking.com.
Few tools are actually totally, or even partially, manufactured by the company on the label, but you might try to find a Milwaukee srevice center. Failing that, try to find a Delta/Rockwell service center or distributor. They too should have a comparable switch. Lastly, an industrial electrical distributor may help.
From what I understand, today's switches are better than those of years ago because many are magnetically operated. When the power goes off to them, they automatically go to the "off" position. This means that if you do blow a circuit breaker, resetting the breaker will not start the saw, you have to flip the switch on the saw also. You might want to check that this is not the problem and see if you can find the manual to go along with the saw.