A single-pole, double-throw switch, when depressed will make
a small clicking sound. This switch, when depressed by hand or by closing the
door, allows electricity to the thermostat on the red or common wire to select
the direction the curtains or doors will travel. When the door is open and the
push-button is out, the electricity goes to the
"raise"-"lower" switch where manual selection of
"open" or "close" is done by hand.
Used on A.T. Newell curtain machines