An APFC Panel (Automatic Power Factor Correction Panel) is an electrical control panel that automatically maintains the power factor of an electrical system by switching capacitor banks ON and OFF according to the load. Its main purpose is to keep the power factor close to unity (typically 0.95–0.99), reducing reactive power, improving efficiency, and avoiding utility penalties. Main components APFC relay (microprocessor-based controller) Capacitor banks Capacitor-duty contactors or thyristor switches MCCB/MCB and fuses for protection Current Transformer (CT) Busbars and enclosure Benefits Improves power factor automatically Reduces electricity bill penalties due to low power factor Lowers power losses in cables and transformers Improves voltage regulation Increases the efficiency and life of electrical equipment Typical applications Manufacturing plants Commercial buildings Hospitals Hotels Textile, chemical, cement, and automobile industries Any facility with large inductive loads such as motors, compressors, and transformers If you're studying electrical engineering or preparing for an interview, I can also explain: APFC panel working principle APFC wiring diagram APFC relay settings APFC panel sizing (kVAR calculation) Common faults and troubleshooting