| 摘要 |
FIELD: electrical engineering. SUBSTANCE: given device incorporates three-phase automatic contact circuit breaker which two phases include thermal elements and windings of relay. Overvoltage relay composed of thyristor, stabilizer diode, backward switching diode, electromagnetic tripping unit and two resistors is placed between third phase and zero. Device makes it possible to protect appliances both from switching overvoltages and overvoltages related to break of zero wire in home, transport and other electric installations. EFFECT: enhanced reliability and efficiency of device. 1 dwg øøø1
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