CSC-271E three-remote DTU integrates the functions of remote measurement, remote signaling, remote control, protection and power supply management, wherein the panel there of is installed in 10kV ring main unit, switching station, distribution station, etc. in order to real-timely monitor the status of primary equipment, line voltage and current as well as fault. Due to the adoption of object-oriented modular design, it is able to optionally load any corresponding module according to actual needs and expand capacity, thus presenting good flexibility and expandability.