Kev tiv thaiv hluav taws xob yog ib txoj hauv kev tiv thaiv relay uas ntsuas qhov hluav taws xob ntawm kev teeb tsa ntawm cov cuab yeej tiv thaiv yog siv los ua qhov ntau. Kev tiv thaiv relay tsim los ntawm kev siv hluav taws xob tsawg lossis siab dhau yog hu ua low voltage tiv thaiv thiab overvoltage tiv thaiv, feem.
