6 major considerations should be noted when choosing a voltage stabilizer:

1. Pls open the parcel and check carefully.

2. Check the cabinet shell whether damaged.

3. Whether have manual, certificate, accessories etc 

4. The regulator cabinet electrical components: compensation transformer, voltage transformer, air switches, buttons, lights are intact. 

5. The regulator cabinet fasteners must be tightened and reliable wiring does not allow off phenomenon, if shedding should be tightened.

6. Check the carbon brushes regulating transformers and transmission system: servo motor shaft is rotated by hand, should be able to rotate, and the rotation process, the three-phase brushes regulating transformers six groups, with the naked eye observations have to be the same on the line, if the deviation, the factory must debug the correct.

7. After receive package, the user checks the box and installed within a month, so as not to affect the quality of products use.