100 % Quality = ELDRO® = EMG

100 % Safety = ELDRO® = EMG

100 % Failsafe = ELDRO® = EMG

Electrohydraulic thrusters ELDROclassic®

Highest quality – Maximum safety


All elements of a hydraulic actuation system are combined in the electrohydraulic thrusters from EMG to produce a compact assembly. When switched off, the hydraulic piston with the piston rod is located in its lower end position. When switched on, the hydraulic pump pumps the operating fluid beneath the piston and, in doing so, generates the hydraulic pressure here. This moves the piston up to the maximum stroke path. When doing this, the counterforce – which is generated through an integrated brake or return spring, or an external load (e.g. a brake) – must be safely overcome.

The maximum stroke path of the devices can be externally arbitrarily limited. This can be the case if the brake to be actuated only requires a reduced stroke path for complete opening. In the respective piston end position, the power consumption of the motor reduces in comparison to the power consumed during the lifting process due to the laws of hydraulics. The pressure in the device reaches its maximum value here. The drive motor is therefore relieved in the resting position of the piston. Mechanical overloading of the devices is not possible.


  • Use of robust asynchronous motors
  • Use of high quality materials
  • Use of the proven hydrodynamic principle
  • Broad standard temperature range from –25 °C to +50 °C, expandable to –45 °C to +80 °C with additional equipment, e.g. heating and use of special operating media
  • Mains voltage fluctuations only have a limited influence on the function of the devices, because the motor speed is predominantly dependent on frequency and less on voltage.
  • No thermal protective circuit required
  • Automatic driving back of the piston to the default position when switched off
  • Linear lifting and lowering speeds (exception: motor start-up and run-down range)
  • No sensitive electronic and sensory installation parts needed for the operating principle
  • Long service intervals


Characteristic features

The electrohydraulic system used by the ELDRO® devices, in conjunction with the straightforward integration in brake systems and the simple electrical commissioning process, result in the following features for the diverse operating conditions:

  • High operational reliability
  • Long service life thanks to wear-free operation with permanent self-lubrication
  • Soft and impact-free operation as a systemic result of the hydraulic operating principle
  • Short regulating times
  • Approved continuous operation S1
  • High switching frequency of up to 2000 cycles per hour in switching mode S3
  • Reversing operation without any restrictions
  • Easy installation and removal
  • Arbitrary direction of motor rotation, therefore no changeover contactors required
  • Overloading is not possible during Operation
  • Arbitrary external limitation of the stroke path
  • Stepless extension of the lifting and/or lowering times through the installation of valves
  • The fill level of the operating medium is optimised according to the operating conditions and requires no further inspection.


Technical details are available on request.

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