611 series IEC 61850 Engineering Guide - Motor protection - Transformer protection - 2 winding - Feeder protection - Busbar protection (voltage and frequency) - Grid automation - Busbar differential protection (high impedance) - Generator protection - Back-up protection - IEC 61850 Engineering Guide - REM611 Motor Protection and Control - 611 series Relion Protection and Control - REF611 Feeder Protection and Control - REU611 Voltage Protection and Control - REB611 Busbar and Multipurpose Differential Protection and Control - 2.0 - IEC