Ngā whati ara iahiko kua whakarewaina(MCCB) he taputapu tiaki e whakamahia whānuitia ana i roto i ngā pūnaha tohatoha hiko iti-ngaohiko. Ko te nuinga o te wā ka whakamahia hei tiaki i ngā raina me ngā taputapu i runga i te taumaha, i te ara iahiko poto me te ara iahiko iti, ā, he mahi anō hoki hei wehe i ngā pūtake hiko. He nui te pānga o ngā āhuatanga pēnei i te waitohu, te iahiko whakatauranga, te kaha pakaru me te whirihoranga mahi ki tōna utu. I te nuinga o te wā, ko te utu o ngā kaiwawao hiko noa o te whare kei waenga i te 50 ki te 1,000 yuan, ā, ko ngā hua he iti iho i te 100A te kaha, ko te utu he 50 ki te 300 yuan. Ko te utu mō ngā whakatakotoranga iahiko nui (250A ki te 800A) he tata ki te 300 ki te 3,000 yuan. He tino utu nui ngā hua o ngā waitohu o te ao pēnei i a Schneider Electric, ABB me Siemens. Ka taea e te utu o ētahi hua atamai te eke ki te mano yuan.

Ko ngā whati hiko whakakoi he mea whakamahi nui i roto i ngā whare ahumahi, ngā whare arumoni, ngā pūnaha tohatoha hiko noho, ngā kāpata tohatoha hiko, ngā pūnaha whakaputa hiko photovoltaic me te hanganga hanganga, me ētahi atu. I roto i te mara ahumahi, ka taea te whakamahi hei tiaki i ngā motuka hiko, ngā taputapu whakaputa me ngā raina tohatoha. I roto i te mara hanga, he maha te whakamahinga hei pana matua, hei pana peka rānei o te kāpata tohatoha hei whakarite i te mahi haumaru me te pumau o te pūnaha tuku hiko.