FIELD: instrument making. ^ SUBSTANCE: surface of structure formed by branches of thermo battery adjoining the switch plate extending parts is coated by heatproof dielectric material. Area not covered by said material is defined by the product of thermo element branch thickness and 1/4 of its height. Said uncoated surface features is profiled and provided with extending staggered tenons. Heat sink at hot and cooled switch plates and adjoining areas is implemented by evaporation cooling performed by evaporation system. ^ EFFECT: higher efficiency of heat sink. ^ 3 dwg
