REF620 series Product Guide - Arc protection - Back-up protection - Bay control and measurement - Busbar differential protection (high impedance) - Busbar protection (voltage and frequency) - Capacitor bank protection - Feeder protection - Interconnection protection - Merging unit - Power management/Load shedding - Product Guide - 620 series Relion Protection and Control - REF620 Feeder Protection and Control - 2.0 FP1 IEC