RCDs

An RCD (residual current device), has been designed to protect you from fatal electric shocks as it automatically switches off electricity when there is a fault. This potentially life-saving device protects against electrocution in instances where there is a bare wire, over-heating or earth faults.

RCDs are also known as an RCCB (residual-current circuit breaker) in the UK but in the United States and Canada they are referred to as a GFCI (ground fault circuit interrupter).
If RCDs are regularly tested, they are reliable life-saving devices, reducing the risk of electric shock and protecting your home against electrical fires.

How does an RCD work?
An RCD is placed within the circuits it has to protect. By monitoring the electric current, it can quickly detect when a circuit fails and electricity is flowing incorrectly. When the fault is detected, the RCD switches off the circuit so that the person handling the wires comes to no harm.
RCDs are often integrated with a fuse or MCB (miniature circuit breaker) adding protection when there are excessive current causing spikes or surges in the circuit.

Types of RCD
  • Fixed RCDs: they are installed in a fuse box and are used for both industrial and domestic applications. They protect lots of circuits and provide an excellent level of protection. RCDs located within a consumer power distribution unit are mostly passive. This allows household appliances to re-establish normal operation when the circuit power is restored.
  • Socket-Outlet RCDs: they provide individual protection to the person who is in contact with the equipment. They can be used in place of a standard socket outlet. Socket-outlet RCDs are either active or passive. They are latching in operation so are not ideal for power tools which do not require a restart when the circuit is restored.
  • Portable RCDs: they also only provide individual protection to the person who is in contact with the equipment. They plug into any standard socket, and the appliance is then plugged into the RCD. Portable RCDs are mostly active and unlatch when any abnormality is detected. People who use outside power tools would benefit from a portable RCD as their equipment could become dangerous if they were suddenly reactivated.

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Description Price Number of Poles Current Rating Model Number Trip Sensitivity Rated AC Voltage Mounting Style Range Break Time Series Application Breaking Capacity Circuit Breaker Type Earth Leakage Protection Type Overall Depth
RS Stock No. 732-0077
Mfr. Part No.4 116 64
BrandLegrand
$367.55
Each
units
4 25 A - 300mA 400 V - - - DX3 - - - - -
RS Stock No. 732-0092
Mfr. Part No.4 115 56
BrandLegrand
$334.84
Each
units
2 63 A - 30mA 230 V - - - DX3 - - - - -
RS Stock No. 732-0008
Mfr. Part No.4 112 08
BrandLegrand
$676.56
Each
units
4 32 A - 300mA 400 V - - - DX3 - - - - -
RS Stock No. 731-9607
Mfr. Part No.4 105 06
BrandLegrand
$917.36
Each
units
4 63 A - 30mA - - - - DX3 - - - - -
RS Stock No. 179-9694
Mfr. Part No.A9N18571
$214.98
Each
units
4 125 A - 500 (Earth)mA 415 V DIN Rail Mount Acti 9 Instantaneous Vigi C120 - - RCD - 73mm
RS Stock No. 178-241
Mfr. Part No.2CCF544110E0400 - F404A-40/0.03, 2CC
BrandABB
$227.77
Each
units
4 40 A - 30mA 400 V - SmiSSline Instantaneous F404 - - - - -
RS Stock No. 731-9957
Mfr. Part No.4 111 72
BrandLegrand
$460.80
Each
units
2 16 A - 300mA - - - - DX3 - - - - -
RS Stock No. 124-7723
Mfr. Part No.5SV3344-6KK12
BrandSiemens
$198.32
Each
units
3 + N 40 A - 30mA 400 V DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB - 89.8mm
RS Stock No. 124-7722
Mfr. Part No.5SV3344-6KK01
BrandSiemens
$495.32
Each
units
3 + N 40 A - 30mA 400 V DIN Rail Sentron Time Delay 5SV3 Industrial, Non-Residential, Residential - RCCB - 89.8mm
RS Stock No. 179-9678
Mfr. Part No.A9V89440
$57.93
Each
units
4 40 A - 300 (Earth)mA 400 V DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - - RCD - 73.5mm
RS Stock No. 191-6148
Mfr. Part No.A9Y62740
$722.51
Each
units
3 40 A Acti9iDT40 30mA 400 V DIN Rail Acti9 Instantaneous - - - - Type AC 99.5mm
RS Stock No. 731-9890
Mfr. Part No.4 107 86
BrandLegrand
$440.11
Each
units
2 20 A - 30mA - - - - DX3 - - - - -
RS Stock No. 825-6103
Mfr. Part No.P1RC4P63AC300
BrandLovato
$122.72
Each
units
3 + N 63 A - 300mA 230 V, 400 V DIN Rail - - P1RC - - - - -
RS Stock No. 610-3802
Mfr. Part No.2CSB202101R3250 - DDA202A-25/0.3
BrandABB
$165.34
Each
units
2 25 A - 300mA 415 V DIN Rail pro M compact - DDA 200 A - - - - -
RS Stock No. 732-0036
Mfr. Part No.4 115 06
BrandLegrand
$291.26
Each
units
2 63 A - 30mA 230 V - - - DX3 - - - - -
RS Stock No. 179-9680
Mfr. Part No.A9V69463
$88.98
Each
units
4 63 A - 100 (Earth)mA 400 V DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - - RCD - 73.5mm
RS Stock No. 191-6075
Mfr. Part No.A9DA6610
$586.49
Each
units
1 + N 10 A Acti9iDD40T 300mA 230 V DIN Rail Acti9 Instantaneous - - 6 kA, 4500 A - Type AC 85mm
RS Stock No. 176-807
Mfr. Part No.2CCL562111E0165 - FS401E-B16/0.03
BrandABB
$218.25
Each
units
2 16 A - 30mA 230 V - SmiSSline - FS401 - - - - -
RS Stock No. 731-9893
Mfr. Part No.4 108 02
BrandLegrand
$440.11
Each
units
2 20 A - 30mA 230 V - - - DX3 - - - - -
RS Stock No. 186-3466
Mfr. Part No.444151
BrandABB
$191.21
Each
units
1 + N 40 A FH202 S A-40/0,03 30mA - DIN Rail - Instantaneous FH200 Domestic - RCD - 85mm
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