Qhov tseem ceeb ntawm DC SPD yog cov qauv dub no. Nws muaj Hlau Oxide Varistor sab hauv. Peb hu nws ua MOV. Ua ntej tshaj plaws, peb txuas DC SPD rau hauv qhov tam sim no raws li qhov tam sim no. Tom qab ntawd, peb txuas cov xov hlau zoo, xaim tsis zoo thiab xaim hauv av. Thaum qhov hluav taws xob qis dua qhov ua haujlwm siab tshaj plaws, qhov ua haujlwm ntawm MOV yuav tsis muaj qhov loj. Koj tuaj yeem kho nws li insulator thiab koj yuav tsis them nqi hluav taws xob rau nws. Thaum qhov hluav taws xob siab dua qhov ua haujlwm siab tshaj plaws, qhov ua haujlwm ntawm MOV yuav tsis muaj qhov me me. Koj tuaj yeem kho nws li xaim. Qhov tam sim no yuav hla DC SPD ua ntej, thiab qhov hluav taws xob ntau dhau yuav raug coj mus rau hauv av los ntawm cov xaim av.
Yog li, DC SPD yuav tsum tau teeb tsa ua ke hauv DC cov tes hauj lwm kom muaj kev tiv thaiv thiab muab kev tiv thaiv ib txwm thiab sib txawv. Nws qhov chaw teeb tsa tau pom zoo ntawm ob qho kawg ntawm DC txoj kab hluav taws xob (sab hnub ci vaj huam sib luag thiab sab inverter/hloov sab), tshwj xeeb tshaj yog tias txoj kab kev hla mus sab nrauv thiab ntev.
