I just hooked up one of my Atlas uncouplers to test it out, and had no success.
I wired the screw terminal on the top side of the tie, on the uncoupler track, thru the push button, and on to the Hot lead of my accessory transformer, then jumpered the wired outer rail to my track outside rail.
I then applied track power to my track transformer, and to the accessory transformer, and rolled a car, with a closed coupler, over the magnet, with the round tack directly over the magnet.
When I pushed the button, nothing happened.
Is there some trick to these that I may be unfamiliar with?