Simply a momentary connecting the hot when depressed. Eventually I intend on having this wired into a bench switch that will enable/disable the foot switch function and also operate a warning light. As is, there are no safety lock-outs with this, so I have to be aware of what's going on. Okay for me alone, but if I ever have someone else working in the shop it'll have to have another layer of fool-proofing.
The switch is rated 10 amp at 120, 5 at 240 and I think 3 at 440. My drill is wired for 120 with a 1/4 HP motor pulling 5 amps. The rubber insulator is some old EPDM roll roofing material I scavenged while working in the construction industry.
Here you can see a bit of the structural engineering that went into this. The switch is a side screw mount and the enclosure was an odd base bracket mount thing that was terrible and had to go.
Hope that helps! It really does make drilling and stopping faster, you just can't let your mind wander...