Hanze ya voltage yo hejuru ya vacuum imyenda (VCBs) nibice byingenzi muri sisitemu yo gukwirakwiza amashanyarazi igezweho, yagenewe gucunga ibikorwa byinshi bya voltage neza kandi neza. Ibi bikoresho bikunze gushyirwa muri sitasiyo no mu nganda, aho bikorera kurinda imiyoboro y'amashanyarazi ibikorwa byinshi n'amakosa. Gusobanukirwa uko bakora n'inyungu zabo