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Model Parameters ZX7-315 ZX7-400 ZX7-500 ZX7-630 Input power Three-phase 380V ± 10%,50Hz Rated input current (a) 19 27 35 53 Rated input power (KVA) 12.4 17.6 25 34 Adjusting range of the welding current (a) 20~315 20~400 25~500 30~630 Max no-load voltage (v) 60 (80) Rated duty cycle ratio% 60 Efficiency (%) = 80 Overall dimension (mm) (Length x width x height) 550x300x480 550x300x480 550x300x530 680x310x600