An innovative engineering solution to arrest falls, which can be conveniently clasped on to an anchorage line so as to accompany the user without requiring manual adjustment during upward or downward movement. In case of sensing a fall the device automatically locks against the anchorage line restricting free fall of the user. Besides unmatched Fall Arrest performance, the product has a technical edge in design which ensures that the device can in no circumstances, intentionally or unintentionally be clasped on to the anchorage line in the incorrect manner.