This is the system (2) for feeding a suspended contact line (4), which includes a contact wire (6) consisting of a plurality of conduction sections (10, 30, 50, 70) separated by sections of insulation (20, 40, 60), including power supply substations (120, 140, 160), wherein each conduction section is connected, on the upstream end side, to an upstream substation by means of a upstream controlled switch (135, 155, 175) and, on the side of a downstream end, to a downstream substation by means of a downstream controlled switch (114, 134, 154). such a system includes a detection device (230, 250) associated with a conduction section (30, 50) to be monitored which includes a means for transmitting a characteristic signal (s1, s2) to an upstream or downstream end of the said driving section is a receiving means that can receive the characteristic signal at the other end, wherein the receiving means modifies the value of a status signal (s3, s4) applied to a control circuit to actuate the switch opening downstream and / or the upstream switch.
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