FIELD: electrical engineering; protection of three-phase balanced (induction motors) and unbalanced loads. SUBSTANCE: device has final element 34 and final unit 33; sensor is built up of current transformers 1,2 with resistive load 3,4, three voltage dividers, comparator 14, and tripping unit 27 which actuates final element in case of emergency creating overload hyperbolic characteristic (that is, overload time as function of its rate). Comparator and tripping unit may be built around digital CMOS gates. EFFECT: enlarged functional capabilities and improved reliability of protective device. 2 cl, 2 dwg
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