What is the purpose of arc-fault circuit interrupters (AFCIs)?

The purpose of arc-fault circuit interrupters (AFCIs) is to protect against electrical fires caused by arcing faults. Arcing faults can occur when there are damaged wires or loose connections, leading to unintended electrical discharges. These discharges can generate heat and ignitable sparks, posing significant fire hazards.

AFCIs are designed to detect these dangerous electrical arcs and disconnect the circuit to prevent potential fires. They are particularly important in residential settings where many electrical appliances and wiring systems are used, making the risk of arcing faults higher. By intervening in the event of an arc fault, AFCIs contribute to improving overall electrical safety in homes, thereby significantly reducing the risk of fire incidents related to electrical issues.

The other choices relate to functionalities that AFCIs do not provide. For instance, reducing electrical bills or improving circuit efficiency involves energy management and optimization goals, whereas AFCIs focus specifically on safety by mitigating fire risks. Increasing voltage in circuits does not pertain to the purpose of AFCIs, which are intended for safety rather than enhancing the performance characteristics of electrical systems.