Murray MP120DF 20-Amp AFCI/GFCI Dual Function Circuit Breaker, Plug on Load Center Style Faster, more cost effective installation to meet code requirements compared to installing an AFCI breaker and GFI receptacle For use on Murray load centers that accept UL type MP-GA2 breakers HACR, SWD, 120 Volt AC rated The breaker requires power to run the self test / trip functions (will not test / trip when not installed) The Dual Function Circuit Breaker combines GFCI and AFCI, protecting against both Arc Faults and Ground Faults