Specifications: 1) Wide range voltage regulator 2) Delay output protection 3) Output over voltage protection 4) LED digital display 5) Extreme high voltage protection Primary technical parameters: 1) Input: AC 300 / 420V 2) Output: AC 380V;1% 3) Frequency: 50 / 60Hz 4) Delay output time: 6secs / 3mins 5) High voltage protection: 430V