Self-locking descender for a rope, comprising: - a first flange associated to a pad, - a cam movable at least in rotation with respect to the first flange and to the pad between a first cam position designed to block the rope, and a second cam position designed to allow sliding of the rope, the cam cooperating with the pad to form a blocking zone for the rope, - a first stop mounted on the cam, - a handle movable in rotation with respect to the first flange at least in a first direction of movement between a first handle position and a second handle position, the handle being mounted so as to be movable relative to the cam, - a first ramp fixed to the handle in movable manner, - a spring connecting the first ramp to the handle, the spring being mounted to dispose the first ramp in a rest position, - a first pin mounted on the handle, the first pin being in contact with the first stop when the handle is in a first handle position and the first pin being devoid of contact with the first stop when the handle is in a second handle position, the first pin escaping from the first stop when the handle is in a threshold handle position disposed between the first handle position and the second handle position, the first pin being slidably mounted on the first stop, self-locking descender characterised in that: - the first ramp defines a second stop movable with respect to the handle, - the first pin is slidably mounted on the first stop to an escapement area between the first pin and the first stop where the first pin leaves the first stop, - a second ramp is fixed to the cam and is mounted so as to be rotatable relative to the cam about an axis, the second ramp forming the first stop, - a second pin on top of the second ramp, the second pin contacting the second stop, the second pin being slidably mounted on the second stop to a threshold position where the second pin moves the cam, the second pin being mounted at a distance from the axis of rotation of the second ramp, the second pin biasing the spring when the handle is in a third handle position disposed between the first handle position and the threshold position and the second pin not stressing the spring when the handle is in the first handle position. - a first flange associated to a pad, - a cam movable at least in rotation with respect to the first flange and to the pad between a first cam position designed to block the rope, and a second cam position designed to allow sliding of the rope, the cam cooperating with the pad to form a blocking zone for the rope, - a first stop mounted on the cam, - a handle movable in rotation with respect to the first flange at least in a first direction of movement between a first handle position and a second handle position, the handle being mounted so as to be movable relative to the cam, - a first ramp fixed to the handle in movable manner, - a spring connecting the first ramp to the handle, the spring being mounted to dispose the first ramp in a rest position, - a first pin mounted on the handle, the first pin being in contact with the first stop when the handle is in a first handle position and the first pin being devoid of contact with the first stop when the handle is in a second handle position, the first pin escaping from the first stop when the handle is in a threshold handle position disposed between the first handle position and the second handle position, the first pin being slidably mounted on the first stop, - the first ramp defines a second stop movable with respect to the handle, - the first pin is slidably mounted on the first stop to an escapement area between the first pin and the first stop where the first pin leaves the first stop, - a second ramp is fixed to the cam and is mounted so as to be rotatable relative to the cam about an axis, the second ramp forming the first stop, - a second pin on top of the second ramp, the second pin contacting the second stop, the second pin being slidably mounted on the second stop to a threshold position where the second pin moves the cam, the second pin being mounted at a distance from the axis of rotation of the second ramp, the second pin biasing the spring when the handle is in a third handle position disposed between the first handle position and the threshold position and the second pin not stressing the spring when the handle is in the first handle position.