This ABB white paper guides the selection of residual current devices (RCDs) connected in series, emphasizing protection against DC leakage currents—common in EV charging and renewable energy setups. It explains how downstream RCDs can “blind” upstream ones, compromising safety. The paper recommends using type B RCDs upstream to avoid this, but ABB also offers an alternative: using less-than-B RCDs under strict conditions. It includes configurations, compatibility tables, and adherence to IEC standards, especially IEC 60364. Installers must evaluate load types, RCD coordination, and national regulations to ensure reliable protection.

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