Products | Spring Return Videos: ExMax.. close air-damper 
Spring return time in comparison (Video clips)
Fail-safe quarter turn (90°) actuator ExMax.. size S for automation / motorization resp. closing air damper
Fail-safe because of (mechanical) spring return:
If it matters, the actuator closes the air damper or fire and smoke damper in ~ 1 second (depending on type), also by disconnected power supply! Watch the videos.
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