The better ones are: excellent housekeeper
Festival crown power saver and
Shengzhi Guan Sheng electrics
Shi daheng
All of them have passed the domestic quality inspection, so you can refer to them. Due to various reasons, the power factor of the motor is low in actual operation, and the reactive power and active power of the motor are greatly wasted. Is the electricity saver useful? "There is no doubt about this problem. The power saver produced by regular manufacturers must be useful. The energy-saving effect should refer to the corresponding test report of the product.
The above is some sharing about the power saver.