Features of the boundary protection controller: voltage acquisition; current acquisition; have interphase protection, zero sequence protection, telecommand and extended remote-control closing-opening function; fault detection: have short circuit, ground alarm and other detection and active upload function; record for storage fault of events: the current and voltage setting value shall be recorded not less than 20 times at the time of fault; support serial communication and adopt the standard balanced 101 communication protocol; configure a communication module and an external GPRS module when communicating with the master station separately; have power status indication, switch position status, switch energy storage status, phase overcurrent, ground indication, device anomalies, communication indications and other functions; support local constantan value setting, manual closing-opening operation and fault memory; the protective constant value can be set without charge; have local, remote and latch-up protection output switch; electrical interface with military-grade aviation connector or terminal; built-in super capacitor.