For radiator valves, small valves, and combination valves, electrothermal actuators feature a plunger extended in the de-energized state (NC) for 2-point and quasi-continuous control of heating systems, cooling ceilings, and air after-treatment devices. They include a position indicator and are suitable for the following valves: radiator valves VDN../VEN../VUN../VPD../VPE..; small valves VD1..CLC and V..I46..; combination valves VPP46.. and VPI46..; as well as valves from other manufacturers.