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General Catalogue • Protection Devices • Technical
Residual Current Devices
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