Txij li thaum fuse resistors yog cov tiv thaiv tiv thaiv, lawv ob lub zog yuav tsum tau txiav txim siab thaum xaiv lawv. Raws li cov kev cai tshwj xeeb ntawm Circuit Court los xaiv nws tus nqi tsis kam thiab lub zog thiab lwm yam tsis zoo, tsis yog tsuas yog xyuas kom meej tias nws tuaj yeem ua tau sai sai hauv cov ntaub ntawv ntawm overcurrent, tab sis kuj yuav xyuas kom meej tias nws tuaj yeem ua haujlwm ntev nyob rau hauv ib txwm muaj. Hauv kev hloov pauv ntawm qhov kev tiv thaiv no, thiab tus nqi tseem ceeb ntawm kev tiv thaiv thiab ntsuas lub zog (wattage) yuav tsum yog tib yam, tus nqi tiv thaiv thiab lub zog loj dhau los yog tsawg dhau, txhua tus ua lub luag haujlwm tiv thaiv.
Kev sib txuas tsis zoo los ntawm cov khoom siv hluav taws xob mus rau txhua qhov ntawm lub voj voog, uas ua raws li kev tiv thaiv kev tiv thaiv luv luv (kev ua haujlwm ntawm lub fuse). Thaum kub hnyiab los ntawm kev hloov pauv, xaiv nrog lub zog tseem ceeb ntawm tib qho kev tiv thaiv tus nqi, tsis tuaj yeem nce lossis txo qhov kev tiv thaiv thiab lub zog, yog tias qhov hloov pauv ntawm cov resistor tsis kam thiab qhov qub sib npaug thiab nws lub zog nce, thaum Circuit Court luv Circuit Court txhaum, tsis kam hlawv, yuav tsis ua lub luag haujlwm.