Complementary electric saving apparatus

The utility model relates to a complementary electric saving apparatus which is a special apparatus for power factor compensation. The utility model is characterized in that the apparatus is composed of a voltage meter, a current meter, a potential selective switch, a start button, a stop button, an automatic switch, a current mutual inductor, a fuse, an alternating current contactor and a compensation capacitor. The apparatus is arranged on the low-voltage side of the transformer, and the shape of the apparatus is a single floor type, a suspending distribution box type and a combined distribution screen type. The utility model has the advantages that the power factor of a power using unit is raised, the no-load loss and the idle work demand of the transformer are reduced, and the positive effect of reducing the power loss of a transmission line for an electric utility department is played.