SPAA 120 C and SPAA 121 C Feeder Protection Relay User Manual

This document is a user manual and technical description for the SPAA 120 C and SPAA 121 C feeder protection relays, which provide selective short-circuit and earth fault protection in radial distribution networks. It details the relay's features, including two-phase overcurrent and directional earth-fault protection units, circuit breaker failure protection, and configurable output relay functions.