FIELD: electrical engineering. SUBSTANCE: phase-failure and overload relay protective device for three- phase motors has two current transformers and two thermal relays. Current transformers are saturated at starting currents and maximum reduction on secondary current through these transformers occurring at low ratios of overload current are compensated for by slight correction of secondary turns. EFFECT: enhanced reliability of motor phase-failure and overload protection. 1 cl, 1 dwg
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