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EC 250

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  • Full redundant external high efficiency power supply, IP66
  • High torque
  • Maintenance-free brushless disc motor


This new generation of actuators provides high performance combined with rapid response, irrespective of direction of rotation or shaft position. Functional ranges are provided for marine applications and industrial purposes.

StG EC 250 comes with a fully maintenance-free brushless disc motor who's typical high torque is multiplied by the use of a planetary gear. Due to the low moment of inertia of the motors disc and the sophisticated electronic control rapid response times can be achieved.

In case of power loss the self-locking gear is able to prevent undesired reactions of the linkage. Additionally manual override is possible.

The system is equipped with an external power supply which is redundant to enhance reliability. Both components, actuator as well as power supply, meet the high protection grade IP66 which guarantees optimal resistance to adverse environments. The electronics are fully EMC protected and all customer interfaces are totally galvanically insulated from each other and from ground. To improve durability several protection functions are implemented, for example, actuator current limitation to prevent the actuator from overheating. Communication is done via CAN protocol which provides detailed error reports. Additionally major alarms and status are displayed directly by LEDs at the housing. A contactless position feedback system fully inured to any pollution offers a precise electrical signal of shaft position to any control device.

The use of special materials and long duration lubricants minimizes maintenance and delivers an operating lifetime of ~25.000 h. The design allows any fitting position.




Rotation angle 90°
Torque max. 250 Nm
Steady state torque 125 Nm
No load response
150 ms (40°)
290 ms (90°)
Output shaft DIN 5481 -21×24
Weight < 36.5 kg (without power supply)