Mobile fall arrester on rope with locking function The ASAP LOCK mobile fall arrester is designed to make it easier for the user to manipulate when climbing a rope. In normal use, the device moves freely on the rope, without any manual intervention, to accompany the user in his movements. In the event of a shock or sudden acceleration, the fall arrester locks onto the rope and immobilizes the user. The integrated blocking function allows the user to immobilize the device to reduce the fall height. The connection arm makes the system captive when passing splits. ASAP LOCK is used with an ASAP'SORBER or ASAP'SORBER AXESS energy absorber to work away from the rope.