The LCF 1200/2400 rectifiers are designed to supply several welders at the same time. The multi-operator concept is suitable when fixed installations are preferred and each operator is supplied by a resistor. The investment per welder is low and mains supply is limited to just one spot. At the same time, the maintenance cost is low. Three different open circuit voltages, 50, 55 and 60 volts, can be chosen, where the 50 V connection means lowest energy cost.