Tension limiting element for a fibre optic connection line: - a first and a second receiving device (2, 6), - Means that allow the fibre optic connection to be disconnected at a predefined location, wherein the first and the second receiving device (2, 6) each have a receiving body (3, 7) which - has a holder for receiving and fixing one or more optical fibres (30, 30') parallel to an axial direction and - connecting means for connecting the first to the second receiving device (2, 6), wherein the connecting means are designed such that the connection between the first and second receiving devices (2, 6) can be separated under the action of a predetermined or predeterminable tensile force, wherein the receiving body of one receiving device has a collet chuck with slots and a plurality of tongues and the connecting means are arranged on the tongue of the collet chuck, wherein the collet chuck of the one holding device and a counterpart of the other holding device are designed in such a way that the collet chuck can enclose the counterpart, wherein the collet chuck is slotted in such a way that an internal diameter of the collet chuck can be varied at least in a partial region, characterised in that a securing element rotatable about an axis of rotation extending in the axial direction is arranged above the tongue, so that a clamping force of the tongues can be influenced depending on the position of the securing element, wherein the securing element can be rotated into an open position, in which no influence is exerted on the clamping force of the tongues, and into a closed position, where any movement of the tongues is blocked. - a first and a second receiving device (2, 6), - Means that allow the fibre optic connection to be disconnected at a predefined location, wherein the first and the second receiving device (2, 6) each have a receiving body (3, 7) which - has a holder for receiving and fixing one or more optical fibres (30, 30') parallel to an axial direction and - connecting means for connecting the first to the second receiving device (2, 6), - has a holder for receiving and fixing one or more optical fibres (30, 30') parallel to an axial direction and - connecting means for connecting the first to the second receiving device (2, 6), wherein the connecting means are designed such that the connection between the first and second receiving devices (2, 6) can be separated under the action of a predetermined or predeterminable tensile force, wherein the receiving body of one receiving device has a collet chuck with slots and a plurality of tongues and the connecting means are arranged on the tongue of the collet chuck, wherein the collet chuck of the one holding device and a counterpart of the other holding device are designed in such a way that the collet chuck can enclose the counterpart, wherein the collet chuck is slotted in such a way that an internal diameter of the collet chuck can be varied at least in a partial region, characterised in that a securing element rotatable about an axis of rotation extending in the axial direction is arranged above the tongue, so that a clamping force of the tongues can be influenced depending on the position of the securing element, wherein the securing element can be rotated into an open position, in which no influence is exerted on the clamping force of the tongues, and into a closed position, where any movement of the tongues is blocked.