Voltage stabilizer (stabilized power supply) is widely used in industry, agriculture, transportation, post and telecommunications, military, railway, scientific research and culture and other fields. The conventional voltage regulation range of the high-power voltage stabilizer is 220V±20, 380V±20%. The ultra-low voltage voltage stabilizer is used in special environments where the three-phase voltage is lower than 300V or the mains voltage is lower than 190V, and a special ultra-low voltage voltage stabilizer is required. According to customer requirements, the voltage regulation range of the ultra-low voltage regulator can be regulated to: three-phase voltage regulator 260V, single voltage 150V. Compared with the ultra-low voltage regulator, it has the advantages of large capacity, high efficiency, no wave open distortion, and voltage regulation balance. It is suitable for a wide range of loads and can be overloaded with instantaneous. The device (stabilized power supply) is equipped with overvoltage, overcurrent, phase loss, phase sequence protection and automatic mechanical fault protection.