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AVR SPS-3806, SPS-3810 & SPS-3815 are solid state electronic device specifically designed for slip ring type alternators only having high excitation voltage. It constantly monitors alternator voltage, frequency and field current to maintain constant voltage as per load variations. All three AVR models are designed to sense Phase to phase voltage enabling to work for three phase alternators. These AVR are compatible with any type of alternator if used within its specified output power limits. Uniquely a relay less circuit of AVR requires only 5 V AC to build up voltage. AVR parameters can be adjusted precisely through 25 turns potentiometers. It has built in protections like, Under frequency roll off (UFRO) with LED indicator to protect winding burn out due to low frequency, stability setting to set load response time, over excitation current time delay trip with LED indicator and fuse protection.