When using long Safety ropes, there is a danger of a long fall. Fall arresters use the safety rope to create the shortest connection possible between the attachment point and the full body harness. Here we have to differentiate between fixed locking fall arresters (type KB1 and KB2), and free-moving fall arresters (type AH3 and AH4). (...) The locking fall arresters lock on vertical safety ropes and can only be moved in both directions by using the handgrip. Free-moving fall arresters work automatically, they follow the vertical safety ropes, as far as the person secured moves up or down. The free moving fall arresters are equipped with a patented reverse brake, which makes it impossible to put the fall arrester on the safety rope in the wrong direction.