Reply from Manufacturer:
There is a micro switch inside the actuator. When the actuator is all the way in. The BLACK wire and the BROWN wire is make connection. When the actuator is all the way out. The BLACK wire and the WHITE wire is make connection.
This to me suggests 2 contacts/switches? Agreed?
This is the correct assumption.
I.E.
position one = Black (Common) - Brown - end pos. reached
position two = Black (Common) - White - opposite end pos. reached