Lub high-voltage rho tawm hloov ua kom muaj kev ruaj ntseg ntawm cov khoom siv hluav taws xob high-voltage thiab cov khoom siv thaum lub sij hawm tu ua hauj lwm. Nws plays lub luag hauj lwm ntawm isolating voltage. Nws tsis tuaj yeem siv los txiav tawm, input load tam sim no thiab tawg luv-circuit tam sim no. Nws tsuas yog siv tau rau qee qhov kev hloov pauv uas tsis tsim muaj zog arcs, uas yog, Nws txhais tau tias nws tsis muaj arc extinguishing muaj nuj nqi; Raws li qhov chaw teeb tsa, nws tau muab faib ua hom sab hauv tsev thiab sab nraum zoov; Raws li tus naj npawb ntawm cov ncej rwb thaiv tsev, nws muab faib ua ib hom ncej, ob chav ncej thiab peb hom ncej. Txhua theem voltage muaj cov khoom siv yeem. Nws tseem tuaj yeem ntseeg tau cais cov khoom uas xav tau hluav taws xob tawm ntawm qhov chaw nyob hauv cov khoom siv hluav taws xob hluav taws xob siab kom ntseeg tau tias muaj kev nyab xeeb ntawm kev saib xyuas haujlwm. Cov kev sib cuag ntawm high-voltage isolating hloov yog tag nrho cov raug rau huab cua thiab muaj pom tseeb disconnection ntsiab lus. Lub tshuab hluav taws xob cais tsis muaj lub tshuab hluav taws xob tua hluav taws xob, yog li nws tsis tuaj yeem siv los txiav tawm tam sim no lossis luv-circuit tam sim no. Txwv tsis pub, nyob rau hauv qhov kev txiav txim ntawm high voltage, lub disconnection point yuav tsim ib tug muaj zog Lub arc yog nyuaj rau tua los ntawm nws tus kheej, thiab tej zaum yuav txawm ua rau arcing (phase-to-ground los yog theem-rau-theem luv Circuit Court), hlawv cov khoom, thiab ua rau muaj kev phom sij rau tus kheej. Qhov no yog qhov kev huam yuaj loj heev ntawm "rub lub cais hloov nrog load".
High-voltage rho tawm keyboards kuj tseem siv tau los ua cov haujlwm hloov pauv ntawm qee lub circuits los hloov cov kev ua haujlwm ntawm qhov system. Piv txwv li: Hauv ob lub tsheb npav, lub tshuab hluav taws xob hluav taws xob sib cais tuaj yeem siv los hloov lub voj voog khiav ntawm ib lub npav mus rau lwm qhov.