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Description:Interduction The newest generation of single phase and three phase automatic alternating voltage adjuster are easy for you to use. They have many stronger function of auto-adjusting to voltage & current, regulating to voltage & current and phase-shift. 　 Easily Operation: According to your requirement, fix a target value on the display panel, push the starting button lightly, you will get regulating object and observe the displaying digit change simultaneously. Main specifications Input voltage : 220/380V Output voltage : 20-500V(precision 2.5%-5%) Power : under 500KVA Change time : <1 sec Wave distortion: <5% Efficiency : 97% single phase and three phase have protection with over-voltage,under-voltage, overload etc.