Updated: 07.11.2026
The Fitting gearbox sits in the window sash under the handle. Turning the handle makes the gearbox push a drive rod in the rebate, which moves the locking cams around the sash. On a tilt-and-turn window it also switches between turn and tilt position.
Why does the gearbox matter for automation?
A chain actuator cannot open a locked sash. If the window is to stay locked when closed and still open automatically, a Locking drive operates the gearbox: first unlock, then the window actuator opens. Whether a fitting is suitable depends on the manufacturer and type.
Frequently asked questions
Can I still open the window by hand?
That depends on the solution. If the handle stays in the tilt position, only the actuator opens. With a locking actuator, operation depends on the hardware – we clarify this in advance using photos.
Read more
Tools: Calculate force and stroke with the Window actuator calculator, find the right model in a few questions with the actuator finder.
Not sure which actuator fits? Call us at 040 50694631 (Mon–Fri 8 am–5 pm) or use the actuator finder.
Related terms: Chain actuator
Datasheets and manuals · All terms in the glossary
