SPAJ 131 C Three-Phase Overcurrent Relay User Manual and Technical Description

This document is a user manual and technical description for the SPAJ 131 C three-phase overcurrent relay, detailing its two-stage phase overcurrent protection (low-set I> and high-set I>>) for distribution feeders, motors, generators, and transformers. It covers features such as definite-time and inverse-time characteristics, configurable output relays, serial communication, and self-supervision, along with application examples, testing, and technical data.