Tension limiting element for a fibre optic connection line: - a first and a second receiving device , - Means that allow the fibre optic connection to be disconnected at a predefined location, wherein the first and the second receiving device each have a receiving body which - has a holder for receiving and fixing one or more optical fibres parallel to an axial direction (R) and - connecting means for connecting the first to the second receiving device , wherein the connecting means are designed such that the connection between the first and second receiving devices 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 (D) extending in the axial direction (R) 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 , - Means that allow the fibre optic connection to be disconnected at a predefined location, wherein the first and the second receiving device each have a receiving body which - has a holder for receiving and fixing one or more optical fibres parallel to an axial direction (R) and - connecting means for connecting the first to the second receiving device , - has a holder for receiving and fixing one or more optical fibres parallel to an axial direction (R) and - connecting means for connecting the first to the second receiving device , wherein the connecting means are designed such that the connection between the first and second receiving devices 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 (D) extending in the axial direction (R) 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. <EOS>