SPAJ 141 C Combined Overcurrent and Earth-Fault Relay Manual

This document is a user manual and technical description for the SPAJ 141 C combined overcurrent and earth-fault relay, used for selective short-circuit and earth-fault protection of radial feeders in resistance or impedance earthed power systems. It details the relay's protective functions, including three-phase low-set and high-set overcurrent units, non-directional earth-fault protection, breaker failure protection, and extensive configuration options via output relay matrix and serial communication.