If it has three terminals and is illuminated then it most certainly is the type the lamp is powered from the incoming supply, if rated for 120vac, then all you need to do is test for the pair that opens and closes, this will be your hot switched pair, the third is for the neutral.
If the light stays on when you hook it up, just swap the on/off (switched) pair.
Make sure the switch is rated for 120vac first.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.