The ground-fault circuit interrupter, or GFCI, is a fast-acting circuit breaker designed to shut off electric power in the event of a ground-fault within as little as 1/40 of a second. The GFCI will activate when the GFCI's internal current transformer senses more than a 4-5 milliamp loss. Generally the problem will be cause by an appliance taking more power than the breaker can handle.
AFCI's are designed to detect the smallest of arcs and then shut off the breaker. What are arcs? Arcs are when electricity jump from one thing to the next. For example, if you have an outlet with a loose wire in it, there will be a space where the wire doesn't touch the outlet, and that will lead to the wire having to jump (arc) across the wire to the outlet.
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