Model No:ZX7-250/ZX7-315/ZX7-400 voltage:3 phase 380V+-15% rated input current:14.4A/19.7A/27.6A no-load voltage:70V/73V/73V output current:20A-250A/40A-315A/40A-400A rated output voltage:30V/32.6V/36V duty cycle:60%/60%/60% product characteristics: 1. Apply PWM+PFM control technology, constant current, stable welding current. 2. Super power grid compensation capacity, resist the voltage wave of power grid. 3. Small size, light weight, suitable for moving operation. 4. With current prtset function, digital current indication. 5. Apply imported power elements, high speed dynamic response, outstanding arc generating performance, stable welding current, with several protections, high reliability. 6. Applicable for welding low carbon steel, middle carbon steel and alooy steel and other black metals, support cellulose upward and downward welding. 7. Suitable for metal processing for such industries as petroleum pipes, ship making, chemical, boiler, nuclear prower, space, military industrial manufacturing etc.