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1.85
Data is subject to errors and technical modifications.
Residual Current Devices
Technical Data
Commercial
Distribution
Residual Current Devices
A residual current device (RCD) is the generic term for a device which simultaneously performs the functions of detection of the residual current, comparison of
this value with the rated residual operating value and opening the protected circuit when the residual current exceeds this value. These devices can take several
different forms I.e. Residual Current Circuit Breaker (RCCB), Residual Current Circuit Breaker with integral Overload protection (RCBO), or a residual current
device incorporated within a socket outlet or other accessory (SRCD)
Residual current circuit breakers (RCCB) protect against earth faults only and not short circuits. They are usually therefore used in conjunction with overcurrent
protective devices.
MCB/RCCB Co-ordination
Short circuit capacity of the RCCB
only
With MCB’s
RCCB
MTN 6-63A B NBN 6-63A B NCN 6-63A C NDN 6-63A D
2 poles
16A
1500A
6kA
10kA
10kA
6kA
25A
1500A
6kA
10kA
10kA
6kA
40A
1500A
6kA
10kA
10kA
6kA
63A
1500A
6kA
10kA
10kA
6kA
80A
1500A
6kA
10kA
10kA
6kA
100A
1500A
6kA
10kA
10kA
6kA
4 poles
16A
1500A
6kA
6kA
6kA
4.5kA
25A
1500A
6kA
6kA
6kA
4.5kA
40A
1500A
6kA
6kA
6kA
4.5kA
63A
1500A
6kA
6kA
6kA
4.5kA
80A
1500A
6kA
6kA
6kA
4.5kA
100A
1500A
6kA
6kA
6kA
4.5kA