| Model | Unit | UN-3 | UN-25 | 
| Rated capacity | KVA | 3 | 25 | 
| Input voltage | V | 220 | 380 | 
| Duty cycle | % | 12 | 20 | 
| Welding dia. | mm | Low carbon steel: 2.0-6.5 Aluminum: 2.0-6.0 Copper: 1.5-3.5 | Low carbon steel: 6.0-12.0 Aluminum: 4.0-10.0 Copper: 4.0-8.0 | 
| Weight | KG | 60 | 226 | 
| Machine dimensions | mm | 550*600*1100 | 870*570*1270 |