If your light is controlled by two separate switches chose the 3 way or multi location switch. Dmoore is spot on about using the 3 way occupancy sensor but off a bit about needing to replace both switches with occupancy sensors.
Wiring Diagram 3 Way Timer Switch Wiring Diagram
How to wire occupancy sensor with 3 way switch. 3 way and 4 way occupancy sensors for indoor motion detector applications electrical question. The occupancy sensor installation instructions should show how to connect the device to a 3 way circuit without replacing the other switch. Lutron maestro occupancy sensor dimmer. The motion sensor covers 180 so all motion is detected. How to wire a 3 way dimmer with screw terminals in a single pole application. Neutral wire is required adjustable sensitivity with wide field of view.
If your light is only controlled by one switch the single pole switch is used. How to install a motion activated lutron maestro occupancy sensor light switch instructions duration. This motion sensor occupancy switch is a 3 way switch not single pole allowing the lights to turn on from multiple switch locations in the room. How do i wire a motion a sensor to control lights. Theres no need to wave your hands at the sensor. Its called a 3 way configuration even though there are only two.
Make sure you purchase the switch specific for your location. I have a three family home unit and in the common stairwell i have a 3 way switch on the first floor a 4 way switch on the second floor and a 3 way switch on the 3rd floor which are all controlling the common stairway lighting. Here is an example wiring diagram from the lutron maestro occupancy sensing switch installation guide.