The microcomputer based protection and measurement and control device is composed of high integration, bus less chip microcontroller, high-precision current and voltage transformer, high insulation strength outlet intermediate relay, high reliable switching power module and other components. It is an economic protection for the integration of measurement, control, protection and communication. The microcomputer protection measurement and control device has the protection functions of incoming line protection, outgoing line protection, sectional protection, distribution transformer protection, motor protection, capacitor protection, main transformer backup protection, generator backup protection, PT monitoring protection, etc. The microcomputer protection and measurement and control device integrates control, protection, measurement, signal alarm, switching value acquisition and communication functions. Function selection is as follows: