welding machinemig e-250mig e-350mig e -500rated input voltage (v) 3phase, ac415, 5060hzrated input capacity(kva) 8.1 16.8 25no-load voltage (v) dc70 dc70 dc70rage of output current(a) 35-250 40-350 40-500rage of output voltage (v) dc15-28 dc15-38 dc16-42duty- cycle (%) 60%diameter of welding wire 0.8-1.0 0.8-1.2 0.8-1.2-1.6power factor > 0.99efficiency (%) > 89%dimension (mm) 702x324x542 702x324x542 702x354x542weight (kg) 20 25class of insulation hproduction class of case ip21s