Chain actuator 300N 1A

WMU 831

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

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About WMU 831

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

Smoke ventilation

    Smoke ventilation

    The product is suitable for smoke ventilation and use natural driving forces for the efficient exhaust of smoke and heat

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



    The product can with the TrueSpeed™ technology slow down the actuator movement (down to 1mm per second), which enables the actuators to run completely silent.

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, medium chain actuator specially 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 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 MotorLink®
– soft close function
– the electronics in these actuators can be programmed to suit specific requirements – i.e. pressure- and traction force, stroke, speed/sound level with the WAT 100 programming box, this is also possible following installation
– 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
– New processor designed
– The TrueSpeed™ feature enables an opening of 1 mm per second, can control several motor lines simultaneously and ensure higher degree of control
– New five-pole plug solution for easy installation
– Ability to connect pressure safety strips


Installation TypeSurface mounted
Window typesTop hung
Bottom hung
Turning windows
Chain stroke options400mm
Pressure Force300N
Traction force300N
Locking force3000N
Operating speedProgrammable from 1mm/s to 12mm/s with TrueSpeed™
Sound pressure level≤21 dBA (operational speed: 0,2°/s)dBA
≤45 dBA (operational speed: 10 mm/s)dBA
Power Supply24 V DC
Current consumption1A
Nominal Voltage24V DC (max. 10% ripple)V DC
Life spanTested with 10,000 opening and closing movements
Size42 x 623 x 57 (H x W x D)mm
Colour optionsGrey (RAL 9006)
MaterialAluminium housing with steel chain
To be ordered separatelyBrackets and standard extension cables type WLL

Delivery includes

Actuator with 5m 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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