ELECTRIC HEATER Russian patent published in 1994 - IPC

FIELD: electric heaters. SUBSTANCE: lamellar resistive element is provided with current leads and thermo-sensitive detectors (no less than two). Thermo-sensitive detectors are made of material which has positive temperature coefficient and different temperatures of phase transition. One current lead has flat shape and is disposed onto flat surface of resistive element. The other surface of the element is adjoined with thermo-sensitive detectors mounted in series with current leads. Any subsequent thermo-sensitive detector is made of material which has lower temperature of phase transition than previous one. Current lead of any thermo-sensitive detector is connected with motionless contact of multiposition switch. Movable contact of the switch is connected with current lead of the heater. EFFECT: improved efficiency. 1 dwg