An retractable fall arrest device is a piece of personal protection equipment; it should be allocated to a single user (it can only

be used by one person at a time). When the user moves (up or down), the webbing winds onto and unwinds from a pulley. The webbing is kept taut by means of a return spring. In the event of a fall, a system locks the webbing and prevents it unwinding, thus stopping the fall instantly. The energy absorbeur, which is on the main strap, tears to absorb the energy of the fall.