APFC stands for Automatic Power Factor Correction, and an APFC panel is an electrical control panel designed to automatically improve the power factor in a power system. The power factor is a measure of how effectively electrical power is being converted into useful work output. It ranges from 0 to 1, with 1 being ideal. A power factor less than 1 indicates that a portion of the electrical power is being wasted.
The main purpose of an APFC panel is to maintain or adjust the power factor of a system close to unity (1) by automatically controlling the connection and disconnection of power factor correction capacitors. Here are some key points about APFC panels: