Products are used in power supply systems, large buildings, substations, Power distribution in Industrial Park (it can solve the problem of voltage stability. The power control of street lamps in mine and coal mine power distribution room can cover all equipment system applications for the overall transformation of 35kv--220v voltage of high-voltage lines, especially the 485 communication system (such as remote control of mobile phones) can be used to automatically deduct electricity charges (which can be deducted through wechat and Alipay. It can reduce time, pay electricity charges reasonably and save labor costs)