Compact actuator designed to move lower and middle, able to work indoors or outdoors charges. The movement is generated by a robust and reliable acme screw.Actuators Welact 4 and 4M as Welact 4P 125kg 400kg. for the characteristic you do not need brake to hold the load. It has an internal clutch that is activated when reaching the load preseteada by the manufacturer. This actuator is functionally interchangeable with one pneumatic or hydraulic, in intermittent use. In addition, unlike other families have antigiro W4 family in the stem and also has W4M piston position detection with external inductive sensors (.-K-LED-24 SME-8 proximity sensor Reed Switch Code) Late Electrical career, Hall Effect H-Encoder A and B, PLC for remote connection.