ABB ELR Front Panel Residual Current Relay Manual

This document describes ABB's ELR front panel residual current relays, which monitor and protect low voltage distribution networks by detecting earth leakage currents via an external toroidal transformer. These relays comply with IEC/EN 60947-2 Annex M, ensuring guaranteed cumulative operational times when combined with ABB MCBs, MCCBs, and shunt-trips.