The RD series of residual current relays is designed for leakage current detection, protection and monitoring functions, when used in conjunction with an external toroidal transformer belonging to the TR family. It is composed by DIN-rail mounted RD2 and RD3 relays.
The RD2 relays are designed for leakage current detection and are classified as “A Type” according to IEC/EN62020. They are sensitive to leakage sinusoidal currents and to leakage pulsating currents with direct components.
The RD3 family of electronic residual current relays provides residual current protection and monitoring functions according to IEC/EN 60947-2:2006 annex M.