An interruption device arranged in a communication line including first and second cables in series, each including a first group of wires for the transmission of computer data and a second group of wires independent of the computer data, includes: a box provided with first and second input/output sockets with which the first and second cables, respectively, are connected; interrupters each connected between the first and second input/output sockets inside the box and actuable from outside the box, these interrupters being associated respectively with the wires of the first group; and transmission elements not including an interrupter and each connected between the first and second input/output sockets inside the box, these transmission elements being associated respectively with the wires of the second group. In a variant, the second input/output socket is replaced by two sockets associated with the interrupters and the transmission elements, respectively.