Chopper, compressed air plasma cutting system, with high frequency HF striking of pilot arc. Allows a rapid, distortion-proof cutting of all conductive materials such as steel, stainless steel, aluminium, copper, brass. Possibility to use long nozzles. Characteristics: possibility to cut on grids with automatic restart of pilot arc * warning led for torch under voltage, air fault, protections * control of torch cooling * visualization of air pressure * storage of the last 10 alarms * thermostatic, overvoltage, undervoltage, overcurrent, torch shortcircuit, phase failure protections. Complete with torch.