The Model 64-5 Power Factor Regulator is a monitoring and power factor control system. It is designed to help obtain an improved power factor, with a minimum of added capacitors. This device uses a unique phase-angle sensing circuit to monitor the power factor of a 3-phase power line. The Model 64-5 automatically responds to changing power factor by closing or opening the internal relays, which add or subtract capacitor banks on the line. Although intended for 115VAC 60Hz systems, other voltage or frequency models may be available.. Specifications: Voltage Range: 120VAC