Three-phase asynchronous motor PTC protection circuits

Posted on Mar 28, 2007

By the PI.] P-type transistor VT2, VT3 and other components common emitter-coupled trigger (ie, Schmitt trigger device), equivalent to a switching circuit to detect a change in

Three-phase asynchronous motor PTC protection circuits
Click here to download the full size of the above Circuit.

resistance of the PTC thermistor and the control relay KA action. Figure, by the transistor (regulator) VTi, regulator and other components vs a simple series regulator link for supply voltage fluctuations occasions.

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