Residual current devices (RCCB, RCBO, ELCB).

Residual current devices protect people, not cables. There are two types to distinguish: the RCCB provides residual current protection only, so it must be installed in series with an MCB for overload and short-circuit protection; the RCBO combines both functions in one device and takes up fewer modules in the panel.

A residual operating current of 30 mA is the level for protecting people, used for socket-outlet circuits, water heaters, washing machines, damp areas and outdoors. The 100 mA and 300 mA levels provide protection against fire caused by leakage, are installed at the origin of the circuit, and cannot replace the 30 mA level on final circuits. Residual current devices need their test button pressed periodically — a step often neglected in operation.

• IEC 61008-1 for RCCBs, IEC 61009-1 for RCBOs
• 30 mA residual current for protecting people
• Panasonic and Sino
• 2P and 4P

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