What is the primary purpose of an arc fault circuit interrupter (AFCI)?

The primary purpose of an arc fault circuit interrupter (AFCI) is to detect and interrupt arcing faults to prevent fires. Arcing can occur in electrical circuits due to damaged wiring, loose connections, or other issues, which can lead to high temperatures and potentially start a fire. AFCIs are designed to sense these dangerous arcing conditions and quickly cut off the electrical supply to prevent the risk of fire.

This functionality is critical in residential and commercial settings where wiring is concealed behind walls, making it hard to visually inspect for potential hazards. The presence of these specialized devices significantly improves electrical safety by actively monitoring for conditions that standard circuit breakers may not detect. By focusing on the detection of arcing faults, AFCIs play a vital role in enhancing fire safety beyond what other devices, such as voltage stabilizers or overcurrent protectors, can offer.