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WindowMaster WMX 804-1G250S

The WindowMaster WMX 804-1G250S is a high-performance 24V DC chain actuator engineered for precise comfort ventilation and automated window control. Part of the elite WMX 800 series, this model combines a 250mm stroke with advanced MotorLink® technology, allowing for synchronized control and real-time position feedback. Its robust lacquered zinc housing and steel chain ensure long-term durability in commercial and high-end residential settings where quiet operation (≤43 dBA) and discreet aesthetics are paramount.

Quick Answer

The WMX 804-1G250S is best suited for top-hung, bottom-hung, and side-hung windows in smart buildings requiring precise automated ventilation and seamless integration with Building Management Systems (BMS) via MotorLink® digital communication.

✓Programmable opening speeds from 3 to 10 mm/s for customized airflow control.
✓Integrated MotorLink® technology for data communication and millimetric synchronization.
✓Compact 332mm x 42mm x 29mm zinc housing for low-profile surface mounting.
✓Reliable 150 N pressure and 200 N traction capacity with an active safety stop mechanism.
✓Versatile compatibility with Top, Bottom, Side-Hung, and Centre Pivot window types.

Choose the WMX 804-1G250S if you require a compact, intelligent chain actuator with a 250mm stroke that offers full BMS integration, programmable speed control, and ultra-quiet operation for high-end automated comfort ventilation.

✓ Who Should Buy

  • •Facility managers seeking BMS-compatible window automation via MotorLink® for smart building efficiency.
  • •Architects designing low-noise, energy-efficient natural ventilation systems in commercial spaces.
  • •Home automation specialists requiring precise, programmable window opening distances for luxury residences.

✕ Who Should Avoid

  • •Users requiring heavy-duty smoke and heat exhaust (SHEV) capabilities (this model is optimized for comfort ventilation).
  • •Outdoor installations exposed to direct, heavy rain or extreme moisture (IP20/32 rating is strictly for indoor/concealed use).
Product Overview
The WMX 804-1G250S stands out in the WMX 800 series for its perfect balance of power and architectural discretion. Utilizing a high-efficiency 24V DC motor drawing just 1 Amp, it provides a consistent 250mm travel distance, making it suitable for a wide range of frame sizes and profiles. The actuator features a durable steel chain protected by a powder-coated zinc body, available in grey, white, or black to complement modern interior finishes without compromising on structural integrity. Safety and intelligence are at the core of this model's design. It includes an automated safety stop mechanism that halts operation upon encountering obstacles, protecting both the window hardware and the user. With an operating temperature range of -5°C to +74°C, this actuator is built to perform in varying internal climates while maintaining a noise level below 43 dBA, ensuring a near-silent operation ideal for office environments and quiet residential zones.

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Engineering Analysis
The mechanical core of the WMX 804-1G250S revolves around its 24V DC drive system, which manages a 150 N pressure load through a high-tensile steel chain. The programmable speed range (3–10 mm/s) is a critical technical advantage, allowing installers to manage acoustic profiles and mechanical stress on window hinges dynamically. Its IP20/IP32 rating indicates a design optimized for internal environments, while the lacquered zinc housing provides the structural rigidity necessary to handle 200 N of traction force consistently over thousands of duty cycles.

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