Circuit for protecting a switch

A protecting circuit for protecting a switch of an electrical system, said protecting circuit comprising a variable electronic component having a physical characteristic the value of which varies by at least 10% as a function of temperature, the protecting circuit being configured to prohibit a current from passing through said switch when the intensity of said current exceeds a maximum allowed intensity threshold, said variable electronic component being connected in the protecting circuit such that the value of the maximum allowed intensity threshold is directly a function of said physical characteristic,

• wherein the protecting circuit for protecting a switch of an electrical system further comprises:
• a first comparator, comparing a voltage as a function of the current flowing in the switch with a first variable voltage threshold directly depending on the physical characteristic of the variable electronic component, and
• a second comparator, for comparing a voltage as a function of the current flowing in the switch with a second variable voltage threshold directly depending on the physical characteristic of the variable electronic component, the first variable voltage threshold being positive and the second variable voltage threshold being negative.