Core Balanced Current Transformers suitable for the GIC Earth Leakage Relays.
When an earth leakage occurs the resulting imbalance generates a proportional current in the Core Balanced Current Tranformers.
The output of Core Balanced Current Tranformers is connected to the GIC Earth Leakage Relays which measure the leakage level and trips its alarm relay if the leakage current exceeds the relays set point.
For suitable GIC Earth Leakage Relays see 777-7160 and 777-7164