Home  »  Products  »  ATEX actuators Zone 2 and 22  »  N8 Z2/22 Rotary and part-turn actuator

N8 Z2/22 Rotary and part-turn actuator

For Ex zones 2 and 22, the successful N series has been further developed to meet the European explosion protection standards. The actuators have the ATEX certificate number: EPS 19 ATEX 1 047 X.

For the ATEX actuator N8, an additional gear is mounted to increase the torque. The torque range increases from 180 Nm up to 500 Nm. A wide range of options makes this series the optimum solution in plant engineering.

The design of the housing made of die-cast aluminium and zinc in combination with a permanently lubricated steel gearbox with sintered bronze plain bearings allows the use in a wide temperature range and in a rough operating environment.

An electronic positioner (option) can simplify the integration of the rotary and part-turn actuator into the control of complex systems.


Back to product overview


  • Single-phase AC synchronous motor with permanent magnets, reversible 230 V ± 10%, 50/60 Hz ± 5% (data sheet N8)
  • 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:
    • Three-phase motor (data sheet N8 DS)
    • DC motor (data sheet N8 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

Supplementary gearbox

  • Planetary gearbox with hardened gears
  • Permanently lubricated gears
  • Self-lubricating sintered bronze bearings and ball bearings
  • Housing made of aluminium

Output shaft

  • Output shaft with square socket WAF 22 mm (F10 DIN ISO 5211)
  • Diameter 36 mm with feather key
  • Other output shafts on request

Electrical connection

  • Connection terminals positioned centrally close to cable entry
  • Screw-type terminals
  • Two free slots to retrofit additional auxiliary position switches
  • Retrofitting of extensions possible without any problems through additional PCB terminals


  • Open/close signal
  • Options:
    • Additional potential-free contacts
    • Electronic position controller ESR-N (integrated in the actuator or external)
    • Potentiometer 200Ω … 10 kΩ
    • Electromechanical emergency torque limit 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 +80 °C, duty cycle S3-50%
    • 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.