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Types of Residual Current Devices
normally used in Consumer Units
RCD – Residual Current Device
A generic term for devices providing earth fault protection.
RCBO - Residual Current Operated Circuit-Breaker with Integral
Overcurrent Protection
A mechanical switching device designed to make, carry and break
currents under normal service conditions and to cause the opening
of the contacts when the residual current attains a given value under
specified conditions. In addition it is designed to give protection
against overloads and/or short circuits and can be used
independently of any other overcurrent protective device within its
rated short circuit capacity.
RCCB - Residual Current Operated Circuit-Breaker without
Integral Overcurrent Protection
A mechanical switching device designed to make, carry and break
currents under normal service conditions and to cause the opening
of the contacts when the residual current attains a given value under
specified conditions. It is not designed to give protection against
overloads and/or short circuits and must always be used in
conjunction with an overcurrent protective device such as a fuse or
circuit-breaker.
Consumer Unit
MCB
RCBO
RCCB