Just as GFCI or Ground Fault Circuit Interruptor shuts off power to circuits experiencing a ground fault, AFCI or Arc Fault Circuit Interruptor shuts off power to circuits that are arcing. This may be due to frayed wires and such. This device can potentially reduce home fires caused by electrical wire problems.

Building codes (at least in Massachusetts) now specify AFCI circuit breakers to circuits that serve bedrooms.

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