No Sunny, no negative torque switches.
A very basic rundown for you if your interested:
There's a main autofeather system switch, arm test off. Let's say it's switched to arm.
There is a micro switch on each power lever. Their position corresponds to roughly a position that commands 90% N1. With these switches made, the system knows you are commanding high power (pull one or both back and it will disarm the AFX system).
In the AFX system, on each side, there are two torque switches; one set to open at 200 ft/lbs and the other set to open at 400 ft/lbs, as the power is increased.
Now, high power is set and the torque switches are open. You then suffer an engine failure. Tq on that engine drops below 400 and closes the first switch- this disarms the autofeather on the opposite side (you cannot have a double-auto-feather event). Then when the failed engine drops below 200 ft/lbs this will close the second switch- this then commands the dump valve to open and feather the failed prop.