The Sincro BL4B AVR (106659) Automatic Voltage Regulator is designed for use on 50/60Hz brush less generators. The regulator includes Frequency Compensation. The Sincro AVR BL4 B Voltage Regulators is BL4 AVR placed in bigger case for mechanical compatibility with different alternators.
NOW REPLACED by BL4U P/N 157862
All of our AVRs are field type tested.