I-DC fuse iyidivayisi eyenzelwe ukuvikela amasekethe kagesi emonakalweni obangelwa ugesi oweqile, ovame ukubangelwa ukugcwala ngokweqile noma isekethe esifushane. Luhlobo lwedivayisi yokuphepha kagesi esetshenziswa ezinhlelweni zikagesi ze-DC (ugesi oqondile) ukuvikela kumasekethe angaphezu komkhawulo kanye namasekethe amafushane.
Ama-fuse e-DC afana nama-fuse e-AC, kodwa aklanyelwe ngqo ukusetshenziswa kumasekethe e-DC. Ngokuvamile enziwe ngensimbi noma i-alloy eqhubayo eyenzelwe ukuncibilikisa nokuphazamisa isekethe lapho ugesi udlula izinga elithile. I-fuse iqukethe umucu omncane noma ucingo olusebenza njengesici esiqhubayo, esibanjwe yisakhiwo sokusekela futhi sivalwe ngebhokisi elivikelayo. Lapho ugesi ogeleza nge-fuse udlula inani elilinganiselwe, isici esiqhubayo sizoshisa futhi ekugcineni sincibilike, siphule isekethe futhi siphazamise ukugeleza kogesi.
Ama-fuse e-DC asetshenziswa ezinhlobonhlobo zezinhlelo zokusebenza, okuhlanganisa izinhlelo zikagesi zezimoto nezindiza, amaphaneli elanga, izinhlelo zebhethri, kanye nezinye izinhlelo zikagesi ze-DC. Ziyisici esibalulekile sokuphepha esisiza ukuvikela emlilweni kagesi kanye nezinye izingozi.