FIELD: electrical engineering; domestic and industrial installations. SUBSTANCE: device has leakage current sensor, peak rectifier-amplifier, inertial RC circuit with time-setting resistor and capacitor, threshold element with final element, and supply voltage regulator built around voltage regulator diode; newly introduced in device are comparator, OR gate, second time-setting resistor, adjustable divider and resistor, as well as power supply. EFFECT: enlarged protective functions, reduced auxiliary power requirement, enhanced impact of supply voltage on leakage current operating threshold. 1 cl, 1 dwg
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