Which device locks to provide fall arrest during movement?

The self-retracting lifeline is specifically designed to provide fall arrest during movement by automatically adjusting its length. This device includes a spring-loaded reel that allows the lifeline to extend and retract as the user moves, ensuring that there is no slack in the line while allowing for freedom of movement. If a fall occurs, the mechanism activates and locks the line, effectively arresting the fall and preventing injury.

This feature makes it distinct from fall restraint harnesses, which are meant to prevent workers from reaching a fall hazard rather than arresting a fall. A belay device, while used in rock climbing to manage rope and provide fall protection, does not automatically lock and is not typically used for everyday work environments. Static rope, on the other hand, doesn't provide the mechanism for automatic locking during movement and requires a separate device or knot to secure a fall. Thus, the self-retracting lifeline remains the most effective choice for active fall arrest in a dynamic work environment.