The ABB E6H5000 R5000 PR122/P-LSIG WMP 3P NST is a three-phase protection relay or circuit breaker designed for high-performance fault detection and circuit protection in medium-voltage distribution systems. This device integrates several advanced protection features to ensure safe operation, including overcurrent, short circuit, earth leakage, and ground fault protection (LSIG). It is typically used in industrial, commercial, and power generation environments.