Abstract: Component of a fall-arrest apparatus, comprising a first element (7), in particular a yarn, extending longitudinally at least between a first point (5) and a second point (6) and a second element (8), in particular a yarn, extending between the first point and the second point, the two elements being subjected to identical tensile forces at the first and second points, characterised in that, in the tensionless state, the longitudinal extension of the second element is greater than the longitudinal extension of the first element.