FIELD: electrical engineering. SUBSTANCE: device has threshold element connected to final element. The latter also functions as protective gear and has power triac whose gate electrode is connected to anode through diode bridge with field-effect transistor connected across diagonally opposite terminals of bridge, transistor gate being connected to switching stage transistor collector incorporating in its base circuit series-interconnected resistor and voltage regulator diode connected to source of field-effect transistor and its emitter is connected to storage capacitor and threshold element both interconnected in parallel and connected to supply voltage rectifier built around diode through resistor. EFFECT: improved reliability and overcurrent and overvoltage capacity, minimal power loss at load, provision for surge-voltage protection during first ON-operation. 1 dwg
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