Thaum lub fuse nyob rau hauv Circuit Court yog fused, thaum lub voltage thiab tam sim no ncav cuag ib tug tej yam nqi, lub fuse txuas yuav cia li yaj thiab tawg, thiab yuav muaj ib tug rub arc ntawm lub fuse txuas cia li sib cais, uas yog hu ua arc. Nws yog vim hais tias lub teb hluav taws xob muaj zog heev thiab cov pa roj yog ionized, yog li ntawd cov tam sim no dhau los ntawm ib txwm insulating nruab nrab. Kev siv hluav taws xob arc tuaj yeem siv rau ntau lub hom phiaj, xws li hluav taws xob vuam, hluav taws xob arc rauv hauv steel ua cog, thiab lwm yam. Txawm li cas los xij, yog tias lub arc tsim nyob rau hauv lub xeev tsis tswj, nws yuav ua rau kev puas tsuaj rau kev sib kis, kev faib khoom thiab cov khoom siv hluav taws xob.
Lub hav zoov ntawm arc prolongs lub sij hawm ntawm switching apparatus breaking txhaum Circuit Court thiab tsub kom qhov tshwm sim ntawm lub hwj chim system luv luv Circuit Court; Qhov kub siab uas tsim los ntawm arc yuav yaj thiab evaporate qhov chaw tiv tauj thiab hlawv cov khoom siv rwb thaiv tsev. Nws kuj tseem tuaj yeem ua rau hluav taws kub, tawg thiab lwm yam kev phom sij rau cov khoom siv hluav taws xob muaj roj; Vim hais tias lub arc tuaj yeem txav mus rau hauv qhov kev txiav txim ntawm lub zog hluav taws xob thiab cua sov, nws yog ib qho yooj yim ua rau arcing luv luv Circuit Court thiab tus kheej raug mob, ua rau kev nthuav dav ntawm kev sib tsoo. Yog li peb yuav tsum nkag siab thiab tswj lub arc.