FIELD: electrical engineering, applicable for protection of induction motors against asymmetric operating conditions.
SUBSTANCE: the device has "Start" and "Stop" buttons, electromagnetic starter, the first and second capacitors, resistor, power contacts of the electromagnetic starter, electric motor, power source, optotriac, diode bridge, the first lead of the coil of the electromagnetic starter is connected to the neutral operating conductor, the ratio of the resistances of the first and second capacitors equals 2:1, and the resistor equals 
.
EFFECT: enhanced electric safety in handling of the protective device.
1 dwg
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