R220 Automatic Voltage Regulator

The LEROY SOMER R220 AVR (Automatic Voltage Regulator) is a precision-engineered voltage regulation solution designed primarily for single-phase generator applications, though it can also be effectively installed in three-phase 12-wire generator configurations. This OEM replacement AVR ensures stable, consistent voltage output for your generator system, protecting sensitive electrical equipment from damaging voltage fluctuations and surges. The R220 utilizes shunt excitation technology and is specifically designed for compatibility with Leroy Somer’s LSA40 and LSA42.3 alternator series, delivering reliable performance in industrial, commercial, and standby power applications. Whether you’re maintaining critical backup power systems, operating construction equipment, or managing industrial generators, the R220 provides the voltage stability essential for safe, efficient operation.