Adopting high-performance 32-bit ARM microprocessor for real-time signal processing and intelligent control; LCD Chinese display, user-friendly human-machine interface, easy to operate; Residual current (leakage) protection, residual current gear can be set online, with reclosing function; Real time monitoring and tracking of residual current in the circuit, automatic adjustment of gear, ensuring product operation rate and reliability; Long delay, short delay, and instantaneous three-stage protection, using electronic tripping, independent of power supply voltage; Having high breaking capacity to ensure the reliability of line short-circuit protection; Overvoltage protection, undervoltage protection, phase loss protection; Real time display of residual current, three-phase power supply voltage, and load current in the circuit; Protection functions and parameters can be set and modified online; Identify and display the types of tripping (residual current, lockout, overload, undervoltage, overvoltage, phase loss), and store, query, and delete them; Network type has communication functions and can achieve remote signaling, telemetry, remote control, and remote adjustment; Pluggable lightning protection module (optional); Equipped with infrared communication function (optional).