As we all know, the electric voltage of single-phase electric appliance is 220V. The reason why it is called single-phase electric appliance is that it is a power supply circuit composed of a live line and a zero line, which is called single-phase circuit. The three-phase circuit we often say is 380V, which generally supplies power for industrial, commercial or large-scale electrical equipment. This power supply line is generally three live wires, so this power supply mode is called three-phase voltage.

However, for some users, not all electric appliances are three-phase electric appliances, but also single-phase electric appliances and three-phase electric appliances. For users with complex electrical equipment, if there are both three-phase electrical equipment and single-phase equipment, in order to achieve the effect of voltage stabilization for all electrical equipment, they also need to buy single-phase voltage regulator and three-phase voltage regulator. However, at present, many users are looking for a three-phase voltage regulator that can connect both three-phase electrical equipment and single-phase electrical equipment. In this way, users can save land occupation, cost and labor. For enterprises, it can be said that it has saved a lot of expenses.

The three-phase voltage regulators connected to single-phase electrical appliances need voltage regulators with three-phase tap changer function before they can be connected to single-phase electrical appliances. The total power of each phase of the single-phase regulator connected to the three-phase regulator shall not exceed the power of each phase of the three-phase regulator.