Applied in small strength linear actuation of levers, switches, and valves requiring less than 50g or 0. 11 lbs. tension
Applies pull force when energized; When de-energized, shaft is relaxed and free to move back out.
Commonly used in spring-loaded applications to keep tension on the shaft, but not too much that it can't be pulled when energized. There is no internal spring pushing the shaft back out when de-energized.