Chain actuator 400N 2A

WMU 842

  • Actuator for large and heavy windows – an elegant alternative to spindle actuators.
  • For comfort ventilation.
  • For top hung, bottom hung, turning and pivot window.

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About WMU 842

Main features

  • Natural ventilation

    Natural ventilation

    The product is suitable for comfort ventilation to ensure that the building’s users enjoy a comfortable indoor climate

24V Nominal voltage

    24V Nominal voltage

    The product is to be connected to a ±24V power supply



    The product communicates with power supplies with MotorLink® – an intelligent patented digital communication from WindowMaster

UL certified

    UL certified

    The product is UL certified according to UL325 for US and CSA C22.2 no.247-14 for Canada

Product Details

The actuator is a high performance actuator especially designed for large and heavy windows – an elegant alternative to spindle actuators.

Complete opening of the window within 60sec.

– to be used together with ±24V control units or control units with MotorLink®
– can be used together with espagnolette WMB
– synchronization of up to 4 window actuators - no need for an external
   synchronization module
– genuine position feedback and 3 speeds when using control unit with
– soft close function
– built-in electronic load switch-off/end stop
– electronic actuator with micro controller
– the actuator has an integrated reverse function to ensure a prolonged life
   span of the window gaskets
– easy mounting


Installation TypeSurface mounted
Window typesTop hung
Bottom hung
Side hung
Light dome
Facade windows
Chain stroke options750mm
Pressure Force400N
Traction force500N
Locking force3000N
Operating speedProgrammable from 4mm/s to 17mm/s
Sound pressure level≤35 dBA (operational speed: 4 mm/s)dBA
≤43 dBA (operational speed: 13 mm/s)dBA
Power Supply24 V DC
Current consumption2A
Nominal Voltage24V DC (max. 10% ripple)V DC
IP rating54
Life spanTested with 10,000 opening and closing movements
Colour optionsAnodised aluminium
MaterialAnodised aluminium housing with zinc cromate passivated steel chain
To be ordered separatelyBrackets and standard extension cables type WLL

Delivery includes

Actuator with 5m connection cable

Intelligent control of windows: MotorLink®

MotorLink® is a communication technology that enables 2-way control and feedback between window actuators and the Building Management System via the MotorController. All WindowMaster control systems are MotorLink® capable with many of our actuators. Click below to learn more and see related products.

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