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300kv Three Phase Power AVR Stabilizer Voltage Regulator UPS Automatic Voltage Regulator. CPU intelligent control, stable and reliable. Main Control PCB adopts SMT process. Each phase regulated independently, no contact, no abrasion, maintenance free. LCD screen, easy setup with menu button. Response time 40ms, Withstand all kinds of load. Overload, Under/Over Voltage, Short Circuit, Bypass protection. RS485 port(Optional).