supply of heavy duty arc welding machine igbt inverter / thyristor based typeheavy duty arc welding machine igbt inverter / thyristor based type,heavy duty arc welding machine igbt inverter / thyristor based type to the following. make / models: (1) ador: thyrolues 600, or (2) ewac: 600 i, o r (3) panasonic: yd 630 at djf or substantially equi valent to the following specifications: (i) input voltage: 400/ 415 (+,-) 20%. (ii) phase: 3. (iii) frequency: 50/ 60 hz. (iv) max in put kva: 31.5/32.2 (v) forced air cooling,with in built vrd (vi) 2 nos of okc connector ca ble & remote control unit with 10 mtr cable. [ warranty period: 12 months after the date of delivery ] ]