Abstract: The automatic cooling and fire-extinguishing system is designed to be arranged inside the protected equipment, is comprised of the medium vehicle made of polymeric material in the shape of a three-dimensional body, where the vehicle includes the pressurized confined medium and the vehicle is adjusted to spontaneously form a nozzle allowing the medium release, wherein the medium (2) is designed as cooling medium with fire-extinguishing effects; in addition, the system is equipped with a sensor(s) (4) to monitor and evaluate the thermodynamic state of the medium (2) inside the vehicle (1) or on its surface or to release the medium (2) from the vehicle (1) having a general shape, and to perform active intervention against the source of an undesirable change in temperature occurring inside the protected equipment.