Complies to standard IEC/EN 61008-1 SI RCDs offer enhanced immunity against Electrical Disturbances; Polluted and Corrosive environments - Guaranteed performance in harsh operating conditions Ensures continuity of supply in networks with: Transient overvoltages Loads generating HF leakage current i.e. harmonics Loads generating continuous leakage current Ensures tripping on genuine earth fault in networks with: Pulsating DC components HF applications which â??Blindsâ? (non-tripping) the conventional RCDs.