Device for automatic heading of a free lead of a recovered wire, a recovered wire being an electrical wire of an electrical wiring with insulation displacement connectors and having a free lead for a different heading from the insulation displacement connector, the device comprising: - a feeder of one or more electrical wires, the feeder being configured to feed at least one recovered wire to be headed for a predetermined length and to submit a predetermined quantity of the recovered wire from a feeding head; - a transfer unit comprising a stripping unit configured for stripping the free lead of the recovered wire, wherein a first position of submitting of the recovered wire corresponds to the stripping unit; - at least one heading station (6, 7, 8) configured for heading the free lead of the recovered wire; - wherein said feeding head is configured to rotate in a programmed manner to place an end part of the recovered wire under at least one heading station (6, 7, 8) and take a headed recovered wire back, after the heading operations, on a second position that can be near the transfer unit and expected starting position; - the device further comprising a cutting unit configured for cutting the recovered wire at a desired measure after that the feeding head has taken back the headed recovered wire near to the transfer unit and a comb loader having a free seat in a predetermined position; wherein said transfer unit comprises: - a guiding clamp configured to hold a headed recovered wire cut, wherein the guiding clamp is constituted by a couple of locking plates (11,12), wherein those locking plates (11, 12) are configured to be in proximity of a headed end of the headed recovered wire and to rotate; and - a transfer punch, which is configured to slide in a space between the pair of mobile locking plates (11, 12) of the guiding clamp, and to push the headed recovered wire cut into the free seat of the comb loader. - a feeder of one or more electrical wires, the feeder being configured to feed at least one recovered wire to be headed for a predetermined length and to submit a predetermined quantity of the recovered wire from a feeding head; - a transfer unit comprising a stripping unit configured for stripping the free lead of the recovered wire, wherein a first position of submitting of the recovered wire corresponds to the stripping unit; - at least one heading station (6, 7, 8) configured for heading the free lead of the recovered wire; - wherein said feeding head is configured to rotate in a programmed manner to place an end part of the recovered wire under at least one heading station (6, 7, 8) and take a headed recovered wire back, after the heading operations, on a second position that can be near the transfer unit and expected starting position; - the device further comprising a cutting unit configured for cutting the recovered wire at a desired measure after that the feeding head has taken back the headed recovered wire near to the transfer unit and a comb loader having a free seat in a predetermined position; - a guiding clamp configured to hold a headed recovered wire cut, wherein the guiding clamp is constituted by a couple of locking plates (11,12), wherein those locking plates (11, 12) are configured to be in proximity of a headed end of the headed recovered wire and to rotate; and - a transfer punch, which is configured to slide in a space between the pair of mobile locking plates (11, 12) of the guiding clamp, and to push the headed recovered wire cut into the free seat of the comb loader.