Three-phase asynchronous motor PTC protection circuits

  
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 - schematic

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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