The SIGMA F+E 2.0 device is a combined short-circuit and earth fault indicator. Due to the measuring principle the earth fault indication is suitable for networks with low-impedance or solidly earthed neutral. When the phase current exceeds the preset trip current level and the period of the preset response delay, or when the phase current exceeds the previously flowing operating current by a defined factor (self-adjustment), the fault-affected phase will be indicated by a bright flashing LED.
