AC Distribution Box 12-20Kw Three Phase ACDB For Solar Panel. AC Distribution Box is an important part of Solar System. This particular model is best suited for THREE PHASE solar plants of 12-20kW. It gives extra protection to the system in case of failures on load side. Our ACDBs are designed to deliver High Performance and added protection by isolating inverter from mains as and when required. To ensure maximum protection to the sophisticated electronic equipment, it has provision for surge protection in the box.