The present invention relates to a self-adjusting cable of which the material having PTC behavior is an extrudable alloy of compatible polymers of from 20% to 50% of at least one polar polyolefin, of from 50% to 80% of at least one matrix polymer chosen from poly(C.sub.1 -C.sub.4 -alkylene) terephthalates, polyamides, polycarbonates, polyester and polyether copolymers, polyketones and methyl polymethacrylates, or mixture thereof, and of from 5% to 15%, preferably 5% to 10% of at least one conductive filler such as carbon black, and optionally non-conductive fillers. It also relates to the process for the production of said self-adjusting cable.

A invenção atual relaciona-se a um cabo self-adjusting de que o material que tem o comportamento do PTC é uma liga extrudable de polímeros compatíveis de 20% a 50% ao menos de um polyolefin polar, de 50% a 80% ao menos de um polímero da matriz escolhido de poly(C.sub.1 - C.sub.4 - terephthalates do alkylene), polyamides, polycarbonates, copolymers do poliéster e do polyether, polyketones e polymethacrylates methyl, ou à mistura disso, e de 5% a de 15%, de preferivelmente 5% a 10% ao menos de um enchimento condutor tal como o preto de carbono, e opcionalmente enchimentos non-conductive. Relaciona-se também ao processo para a produção de cabo self-adjusting dito.