Ama-circuit breaker amancane angamadivayisi kagesi asetshenziswa ukulawula amanje futhi avame ukusetshenziswa ezindlini, ezentengiselwano nezimboni. Isilinganiso samanje esinenombolo yesigxobo engu-3P sibhekisela kumthamo wokulayisha ngokweqile we-breaker circuit, okuyinani eliphezulu lamanje elingamelana nalo lapho i-current in circuit idlula imanje elilinganiselwe.
I-3P ibhekisela efomini lapho i-circuit breaker ne-fuse kuhlanganiswa khona ukuze kwakhiwe iyunithi ehlanganisa iswishi eyinhloko kanye nedivaysi yokuzivikela eyengeziwe (i-fuse). Lolu hlobo lwe-circuit breaker lunganikeza ukusebenza kokuvikela okuphezulu ngoba alugcini nje ngokunqamula isifunda, kodwa futhi luhlanganisa ngokuzenzakalelayo uma kwenzeka iphutha ukuvikela imishini kagesi emonakalweni wokulayisha ngokweqile.