Eight PTC phase asynchronous motor protection circuit

Posted on Nov 10, 2015

The thyristor control circuit, with the bridge circuit to control the temperature in the contactor coil KM plus a secondary winding wound as

Eight PTC phase asynchronous motor protection circuit
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a power protection device. R. thermistor , (R:., Rt3) and a resistor R. (Rz, Rs) string associated voltage divider, the diode gates (VDi, VD2, VD3) VT unijunction transistor with the emitter connected in a bridge circuit having switching characteristics.

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