Four arc submergé - ñu xamee ko ci four arc électrique wala four resistance électrique - ñu ngi koy njëkka jëfandikoo ngir wàññi macceer yu bees yu melni minerais, agents réducteurs carboniques, ak flux. Bokk na ci jumtukaayi usine yi gëna am solo ngir defar ay ferroalloy (lu melni ferrosilicon, ferromangan, ferrokrom, ferrotungsten, ak aleage silicomangan) ak ay produit chimik yu melni carbure de calcium.
Four bi dafay dox ci revêtement bu am karbon wala magnésie ak ay electrode yuy lakk seen bopp. Dafay dox ci anam wu wéy, muy jëfandikoo arc buy dugg ci biir ndox, fu ñuy dugal ay electrode ci biir charge furnace bi, te dafay jëfandikoo energie arc ak tàngoor buy xeex (biy génn ci courant biy jaar ci charge bi) ngir xeeñ wen wi; sarse defay wéy di am, ci noonu la tapping ci metal buy seey ak slag di am ci diir bu gàtt. Transformatër biy liggéey ci four bi dafay dox ci biir sarge bu wéy, bu dëgër, am voltage impedance bu woyof, jéego yu bari yuy yamale voltage bi ak yokkute yu ndaw, ak kàttan sarge bu bari. Transformatër yooyu am nañu ñaari xeetu: yamale tension sargal ak yamale tension sircuit (amul excitation). Dañuy joxe génnug kuuraŋ bu sax ci jéego voltage yu njëkk yi ak génne courant bu sax ci jéego yi ci topp.