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BL4 AVR - Sincro
https://www.macfarlanegenerators.com.au/products/502/BL4-AVR-Sincro

The Sincro BL4 AVR (106657) Automatic Voltage Regulator is designed for use on 50/60Hz brush less generators. Regulator includes Frequency Compensation. NOW REPLACED by BL4U P/N 157862 All of our AVRs are field type tested.




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