PTC three-phase asynchronous motor protection circuit 8
Source: InternetPublisher:Lemontree Keywords: PTC protection circuit three-phase asynchronous motor motor protection Updated: 2021/09/13
The circuit adopts thyristor control and a bridge circuit to control the temperature. A secondary winding is added to the contactor KM coil as the power supply of the protection device. By thermistor R. , (R.:, Rt3) and resistance R. The voltage divider composed of (Rz, Rs) connected in series
is connected to the emitter of the single-junction transistor VT through the diode gate circuit (VDi, VD2, VD3)
to form a bridge circuit with switching characteristics.
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