What is the primary function of an Arc-Fault Circuit Interrupter?

The primary function of an Arc-Fault Circuit Interrupter (AFCI) is to recognize and de-energize circuits during an arc fault. An AFCI is designed to detect the presence of arcing conditions that can lead to electrical fires. These arcing situations can occur when there is a loose connection, damaged wire, or other issues that cause electrical arcs. When the AFCI detects an arc, it interrupts the current flow, effectively de-energizing the circuit to prevent potential fire hazards. This protective measure enhances electrical safety in residential and commercial environments, making it an essential component of modern electrical systems.

The other options address different aspects of electrical safety and functionality. For instance, ground fault protection is typically the role of Ground Fault Circuit Interrupters (GFCIs) rather than AFCIs. Additional circuits for appliances are managed through traditional circuit breakers and the distribution of electrical capacity, while converting AC to DC safely is related to rectifiers or power supply units, which perform very different functions than those of an AFCI.