The invention relates to the means for controlling pre-fire situations resulting from local overheating of electrical equipment and is intended to prevent fires caused by faults in electrical wiring, in particular faults in wiring devices. The system consists of a gas sensor connected to a recorder that is connected to the signal delivery system and the polymeric crosslinked composite material applied to heat-prone areas of an electrical circuit having an opening temperature in the range of 80-200 °C and containing a light-boiling substance within it that is easily detected by the above-mentioned gas sensor. The technical result of the claimed solution is to increase the probability of detecting a pre-fire situation at an early stage.