An AFDD (arc fault detection device) is a safety device that is designed to protect against electrical fires by detecting arcs (sparks) in the electrical circuit and interrupting the power before a fire can start. AFDDs are typically installed in the electrical panel or at the point of use and are required by code in many areas for new construction or renovations. They are an important safety feature that can help to prevent serious injuries or damage to your home in the event of an electrical arc or malfunction.