What is the purpose of an Arc-Fault Circuit Interrupter (AFCI)?

An Arc-Fault Circuit Interrupter (AFCI) is specifically designed to enhance electrical safety by identifying and responding to abnormal arcing conditions in electrical circuits. When an arc fault occurs, which can be caused by damaged wires or loose connections, the AFCI senses the presence of an arc and promptly de-energizes the circuit. This quick action prevents the risks associated with arcing, such as electrical fires, which can arise from sustained arcs that generate heat.

The other options discuss unrelated functions. Detecting heat levels is generally associated with thermal sensors or heat detectors, rather than arc-fault interrupters. Providing overcurrent protection relates to devices like circuit breakers that protect against excess current flow, but does not specifically address the dangers of arcing. Interrupting power during a storm may refer to surge protection or other measures taken to safeguard circuits from external power fluctuations, which is outside the scope of an AFCI's purpose. Hence, understanding the primary role of an AFCI being to deactivate in the presence of arc faults solidifies the grasp of its function in fire prevention and electrical safety.