In our country, with the development of market economy, stealing power energy is become more and more serious. How to perfect the technology of preventing stealing power energy to restrict this deed is a problem which most of power supply corporations are care of in a long time.
In order to restrict the deed of stealing power energy and in order to expand the applications of SCM into industrial appliances。This thesis talked about an ammeter box control device which controlled by AT89C2051 (MCU). This device is safe, practical and low cost. The control part of the MCU system AT89C2051 and x5045p (two x5045p watchdog chips using SPI communications watchdog chip, one in a key, the other in a control board) By comparing password preestablished and password stored in X5045 in the control board, then decide the Pick-up and release of relay and control the breaker. To achieve the purpose of preventing stealing power energy.
Keywords: Micro Controller Unit (MCU),AT89C2051,X5045P,Watchdog , Preventing Stealing Power Energy