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High-Quality R250 AVR Replacement for Lsa Series Alternators. High Reliability Design: Shunt excitation design for stable voltage regulation in small and medium-sized brushless generators. Comprehensive Protection: Features overload, short-circuit, over-excitation, under-voltage protection, and 6A slow-blow fuse. Low Power Consumption: Designed for energy efficiency with rated excitation current of 4A continuous operation. Easy Installation: Fixed installation method suitable for household backup and commercial emergency power systems.