The Amperite 120AF/ARDFA is a type of delay and rise time control module used in industrial circuits, such as motor starters, contactors, and switchgear. It is a three-phase voltage regulator that can reduce up to 5 cycles of neutral voltage, providing a regulated voltage output from a three-phase source. It is primarily used in three-phase power systems to reduce surge voltages, improve system stability, reduce contactor wear, and improve system reliability. It features adjustable rise and fall times, adjustable voltage regulation limits, and adjustable soft-start functions. It also prevents short-term inrush current and improves system load regulation.