Murray MPA120AF 20-amp, Single Pole, 120-volt, Plug On Type, Branch Feeder Style AFCI Breaker Detects arcing faults that standard circuit breakers are unable to detect Intended to mitigate the effects of parallel arcs (line-to-ground or line-to-neutral) by de-energizing the circuit when an arc-fault is detected Industry exclusive LED light to indicate type of trip