KPD series voltage stabilizer is composed of a contact voltage regulator,a sampling control circuit,an overvoltage protection,a delay output circuit and a servo motor. When the input voltage or load changes,Sampling control circuit sampling,amplification,so that the servo motor according to the required direction by regulating the pressure for carbon brush position,adjust tht output voltage,until to meet the ratings,In order to achieve the purpose of stabilizing.This voltage stabilizer has small volume,high efficiency,small waveform distortion. The regulator can be set up pressure and delay protection according tp user needs.it can be widely applied to industry ,agriculture,medical,broadcasting,building machine,air condition,refrigerator and other household appliances,lighting and so on all the need to stabilize the place.