... 3) long time continue working Good performance MMA-250T DC inverter welder Use: light manufacturing, maintenance, civil steel structure ... carbon steel, carbon steel, alloy steel, etc.; Advanced inverter technology: Inverter frequency up to 100KHz, conversion rate of 85%, no-load ... voltage(V)(3PH)380380Rated input capacity(KVA)912Input voltage frequency(HZ)50/6050/60No-load voltage(V)6060Output current ...