EWA knows no compromises and displays no weaknesses

Lock EWA power drives are a dependable power source for every application. Slow-­running with self-locking worm gear units and integrated limit switches, they perform their tasks for decades without requiring any maintenance work. As option A60 also suitable for use in the open air.

As a low-cost alternative, there are the HWA manual drives that are of course easy to retrofit as EWA power drives.

Lock drives can be used for far more than ventilation tasks. Much of what you have to lift and relocate you can make happen using drive units and accessories from Lock.

  • Torque range of 50 –1500 Nm
  • Speed range of 1–10 rpm
  • Installed precision END 20 gear limit switches
  • Dimensioning for decades of operational service
  • Self-locking worm gear units
  • Quality motors with multi-range voltages for 50 Hz and 60 Hz
  • Turnkey status for single-phase motors
  • Optional PAR 06 potentiometer pre-installed
  • Fast version without self-locking available
  • 60 Hz motors and microswitches are cURus certified (cURus = UL Recognized Component Mark, valid for USA and Canada)
Lock EWA

Advantages of Lock drives

  • Standard mounting dimensions
  • Compact shape
  • Uniform shaft length
  • Any installation position
  • Optional LockLogic®  
  • Zero-maintenance
  • Selection of shaft types
  • Extremely quiet operation
  • A60 for use in the open air

END 20 – Precision for EWA

END 20 – Precision for EWA


Lock drive units have been renowned for decades for their high power reserves. A power rating of 250 Nm means that at least 250 Nm of power will be delivered!

  • Dynamic and static self-locking, even under extreme conditions.*
  • The details quoted for nominal load are minimum figures.
  • High power reserves throughout the entire service life.
  • Electric motors with optimized characteristics to suit every variant.
  • Powerful single-phase motors, pre-wired ex-factory.

* All load details in the catalogue refer to dynamic self-locking. The values for static self-locking are much higher.

Lock power of EWA


Lock always offers you a large number of types, variants and options to enable you to select the ideal solution for your application.

  • Torques and speeds (see table)
  • Shaft ends We 06, We 66, We 19
  • External installation A60 (option)
  • Special voltages 1~, 3~, DC
  • Types of mounting and mounting positions
  • END 20 switch elements, PAR 06, PAR 10
  • Colour DB 701 platinum grey
Lock selection of EWA applications


The broad and diverse product portfolio and the modularity of the drive units in conjunction with the gear units enable systems to be created that can move loads perfectly in a point-to-point, linear or surface way.

Lock point modularity of EWA
Lock line modularity of EWA
Lock face modularity of EWA