Cov khoom seem tam sim no relay series yog siv rau hauv av txhaum kev tiv thaiv circuits los tiv thaiv cov khoom siv hluav taws xob puas tsuaj thiab hluav taws kub nyhiab tshwm sim los ntawm cov khoom siv hauv av txhaum tam sim no, thiab tseem tuaj yeem muab kev tiv thaiv tiv thaiv hluav taws xob tiv thaiv hluav taws xob. Lub relay tuaj yeem tsim cov khoom siv sib xyaw ua ke, uas yog siv rau TT thiab TN qhov hluav taws xob faib hluav taws xob ntawm 50Hz alternating tam sim no.Residual Tam sim no Relay series yog ib qho yooj yim heev rau siv nrog rau ntawm qhov chaw thiab tej thaj chaw deb sim rov pib ua haujlwm.