GAVR-15A is A Universal 15 Amp 1/2 Wave Self  Excited Dip-Switch Programmable Automatic Voltage Regulator
Features:
< 0.5% Regulation
220/400 V AC Programmable Input
Rugged Compact Design
With Under Frequency Protection
Soft Start Voltage Ramping
EMI Suppression
Built-in High  Capacity 15Amp Fuse