Arc-Fault Circuit Interrupter breakers are designed to do what?

• A. Protect the entire circuit from an arc-fault
• B. Trip only on overload
• C. Protect the circuit from ground faults
• D. Only monitor leakage to earth

Answer: (A)

Arc-fault breakers are built to detect arcing in a circuit and disconnect the circuit to prevent fires. They monitor the electrical current for the telltale patterns of arcing—irregular waveforms and rapid changes that indicate a dangerous arc—and trip quickly when detected. This protects against fires caused by loose connections or damaged insulation, which can create dangerous arcs. They do not primarily focus on ground faults (that’s what GFCIs do) or simply monitor leakage to earth; they also provide overcurrent protection, but their main purpose is stopping arc faults.