The RGE series are compact electronic earth leakage relays that work with an external toroidal transformer of the Circutor WG/WGC range, ordered separately and sized to the cable it encircles. The relay measures the residual current — the difference between the current flowing out to a load and the current returning from it, which is only non-zero when some of it is escaping to earth — and signals a separate switching device to open. That split is what allows the arrangement to protect circuits far larger than any self-contained RCD can handle, and to be set independently of the breaker it drives. They are type A devices with high-frequency filtering and true RMS (TRMS) measurement, occupy a reduced two-module width, carry LED status indication and are built to IEC 60947-2, IEC 60755, IEC 62020 and IEC 61008. This is the RGE-R5A variant. It runs from a 230 V AC supply within a 195–265 V range and provides a change-over output contact together with normally-open and normally-closed contacts. The external toroidal transformer is not included and is selected to suit the cable diameter and the sensitivity required. Manufactured by Circutor (Spain) and supplied under the Function brand; the Circutor catalogue reference is RGE-R5A. Supplied by cBallast on quote-to-invoice terms; lead time and freight are quoted per RFQ against the destination Incoterm.