The SGI fault direction indicator enables reliable detection of earth faults and short circuits, including fault current direction, in rigidly earthed, resistively earthed, isolated, and compensated medium-voltage networks. Multiple detection algorithms and extensive measurement and configuration options make the SGI particularly versatile. Parameterization is carried out entirely via an OLED display with rotary encoder buttons, without the need for external software. In addition, the SGI supports data logging, remote integration, and a battery-free power supply with long-term buffer.