Yiyuan is China online UPS manufacturer. Online UPS is for environment where electrical isolation is necessary or for equipment that is sensitive to power fluctuation. Basic technology of online UPS is the same as in Standby or Line-Interactive UPS. It typically costs much more. We offer superior voltage regulator, on line UPS, single phase AVR, off line UPS at economical price. Our regulator and uninterrupted power supply are used for electric power supply system, communication system and automatic control system. We are regulator and UPS OEM, quality and low price voltage regulator for your order, welcome.