Thyrobox DC-3, a modular DC process power supply system, is ideal for industrial applications with high power requirements. It was designed to provide a good power factor and minimized harmonics. The smallest system has an output power of 1,500 A and can be modularly expanded to 30,000 A. Due to this wide output power range, load voltages from 20 V up to 500 V can be realized. Thyrobox DC-3 can be connected either to the low- or medium-voltage grid.