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KA Z2/22 Linear actuator

For the Ex-zones 2 and 22 our linear actuators of the KA series have been further developed to meet the European standards of explosion protection. The actuators have the ATEX certificate number: EPS 19 ATEX 1 047 X.

ATEX linear actuators of the KA series are used for sensitive adjustment of dampers of all systems in air conditioning, ventilation and heating systems as well as in furnace construction, plant engineering and other industrial areas.

They are available with a force of 400 N - 5000 N. The lifting units allow strokes from 150 ... 1100 mm.

The technical design corresponds to the drives of the N series. The limit switching is travel-dependent. One travel limit switch for each end position is available as standard. They are designed as changeover switches and can perform additional functions such as end position indication or sequence control. Furthermore, an electronic positioner for an exact position or for modulating control operation is available as an option. By installing a relay, several actuators can be controlled simultaneously over a common contact.

A stable cast iron bracket is available for mounting the actuator. The connection to the push rod is made by a connecting bolt supplied. The spindle is protected by a protective tube.

Depending on the operating time, actuators of this series can also be supplied with a force-dependent cut-off (option). This shut-off prevents damage to the valve in case of blockage.

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  • Single-phase AC synchronous motor with permanent magnets, reversible 230 V ± 10%, 50/60 Hz ± 5% (data sheet KA)
  • 100% duty cycle as standard
  • Short start/stop times
  • Insulation class B to VDE 0530
  • Synchronous motors maintain speed and positioning time irrespective of the load
  • Tropical insulation
  • Options:
    • DC motor (data sheet KA DC)
    • Custom voltages
    • Custom frequencies


  • Spur gearing with straight-toothed steel gears
  • Rugged, maintenance-free
  • Permanently lubricated gears
  • Self-lubricating sintered bronze bearings
  • Encapsulated version, operates in any position

Stroke unit

  • Fixing bracket made of die-cast aluminium
  • Spindle made of stainless steel
  • Spindle self-locking
  • Needle bearings to absorb axial forces
  • Steel and bronze materials for good anti-seizure properties

Electrical connection

  • Connection terminals positioned centrally close to cable entry
  • Screw-type terminals
  • Two free slots to retrofit additional position switches
  • Retrofitting of extensions possible without any problems through additional PCB terminals
  • Infinitely adjustable control cams
  • Open/close signal
  • Path-dependent limit switch-off
  • One limit switch each for the end positions
  • Options:
    • Additional potential-free switching contacts
    • Electronic position controller ESR-N (integrated in the actuator or external)
    • Potentiometer 200Ω … 10 kΩ
    • Electromechanical force-sensitive switch shuts off the motor if a blockage occurs

Ambient temperature

  • -10 °C to +60 °C
  • 0 °C to +60 °C when an electronic position controller ESR-N is used
  • Options:
    • Up to +100 °C, duty cycle S3-2 min / 24 h
    • Down to -40 °C


Switches for series

Switches for series

  • Contact material: Silver
  • Max. switching capacity: 6 A, 250 V AC
  • Positive-break switches (optional)
  • Gold contacts for switching smallest loads (optional)


  • All switch contacts routed to terminals
  • Switching angles infinitely adjustable by means of cams
  • Retrofit switch sets available
  • Changeover contact (SPDT)

For actuators: N, NV, NE, K, KA, V




  • Adjustable cam that can be adjusted from above, consisting of brass body and plastic cam ring
  • Different cam shapes available

For actuators: N, K, KA, V, NV, NEx

Download Datasheet


Electronic position controller ESR-N

Electronic position controller ESR-N

Built-in version: N, NV, K ,KA,V, NEx
External version in device base (for mounting onto standard 35 mm mounting rails)

  • Industrial-standard multilayer PCB
  • EMC tested PCB layout
  • Control electronics internally fused
  • Relay output stage with RC snubber circuit across relay contacts for motor control
  • 12 bit setpoint value input
  • 12 bit actual value output



Potentiometers are favourably priced, robust angle encoders for actuators. Several different versions are available to choose from:

  • Conductive plastic potentiometers (standard) or wire-wound potentiometers (on request)
  • Single-turn or multiturn potentiometers
  • Single or tandem potentiometers
  • Potentiometers approved for gas/air ratio control systems to DIN EN 12067-2:2004-06
  • Custom potentiometers (resistance value, angle of rotation and so forth) on request

Depending on the actuator model and its configuration it is possible to fit up to three potentiometers.
To obtain highly accurate evaluation results the resolution of the maximum angle of rotation of rotary and part-turn actuators is set to the electrical angle of rotation of the potentiometer. Other resolutions are available on request.
The resolution of the maximum linear regulating distance of linear actuators is set to the electric angle of rotation of the potentiometer.