FIELD: electrical engineering, protection of A C electric installations against short-circuits, overcurrent tripping mechanisms for automatic switches. SUBSTANCE: proposed device has current transformers, rectifier, measurement element and actuator. Technical objective of invention consists in suppression of dependence of time lag during short-circuit on type of abnormal condition ( single-, double-, three-phase ) and value of current, in improvement of conditions for matching of selectivity stages in protected installation, in increased noise immunity and reliability of device without current and time reset ratios. EFFECT: expanded application field of device. 3 dwg
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