With the rapid development of economy, energy shortage, environmental degradation has attracted close attention globally. Energy is an important basis for the development of national economy. In order to respond to national calls and take the road of sustainable development, energy saving is the priority. Among them, the electrical energy consumption is relatively larger than any other energy consumption. Therefore, the unified management of electricity is particularly important. An accurate and reliable measurement of electricity is necessary to save energy effectively. The low voltage power distribution devices, which designed in line with the standards of power distribution system, are highly professional and automated, and it is easy to operate with excellent performances and stability. The device can allocate loads reasonably based on customers’demand, achieving optimal operation, effective energy-saving and provide necessary conditions for energy management.