An Arc-Fault Circuit Interrupter (AFCI) breaker trips because its internal microprocessor has detected dangerous unintended electrical arcing, an overcurrent overload, or a ground fault on the branch circuit. This protective action is designed to prevent electrical fires caused by sparking wires behind walls, damaged appliance cords, loose terminal connections in outlet boxes, or pinched cables. When an arc occurs, erratic high-frequency waveforms are generated, which the AFCI sensor identifies and responds to by instantly cutting power. You can troubleshoot trip causes safely by reviewing what devices were active. You can verify that your corrective action is successful when inspecting power cords for fraying, securing loose junction box wire nuts, and resetting the breaker ensures it remains engaged under normal operating loads.
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