Particulars units wr20th wr30th wr40th wr60th input supply volts 415 v â± 10%, 3 phase, 50 hzs. Ac open circuit voltage (ocv)(max.) v. Dc 80 95 welding current range amps. Dc 10 - 200 10 - 300 10 - 400 10 - 600 max weldingcurrent @ 60% duty cycle amps. 200 300 400 600 rating...