a coil system for every movement of direction Return time = pull-in time no reduction in solenoid force caused by return spring
Combination of two coil systems with a common plunger. For every stroke direction a coil system is stimulated, i.e. the second coil system is used for the plunger return.

Advantages: no return spring or external return force is necessary, no reduction of the solenoid force by return spring, return time is as short as pull-in time. Bistable versions are possible by means of built-in permanent magnets.