Safety devices
Dual-function breaker
A dual-function breaker combines arc-fault and ground-fault protection in one breaker, so a single device guards a circuit against both hazards.
Siemens says its residential dual function circuit breakers combine Class A 5mA GFCI and AFCI protection. Leviton explains that the "dual function" name means AFCI plus GFCI, and that these breakers also give combination-type AFCI protection against parallel and series arcing. One breaker then covers AFCI and GFCI duty.
Dual-function protection also comes as an outlet. The breaker version sits in the breaker panel and protects the whole circuit. Adding or swapping a breaker means working inside a live panel, so call a licensed electrician. See GFCI vs AFCI.
Related terms
Sources
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