The SUE21 actuator is designed for regulating hot/cold water in heating, air conditioning, and ventilation applications. It forms an ideal combination with Siemens combi valves VPI46..., VPP46..., VQI46..., and VQP46..., which it controls with a 2-position SPST signal received from the heating controller (room thermostat). The actuator body features an LED indication of the spindle position. The actuator can be connected in parallel with other actuators.

The actuator has a control force of 100 N, and its maximum stroke is limited by the valve seat. In both end positions, the actuator has no power consumption. It is powered by an integrated cable with a length of 0.8 m.