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