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. 239-4969
Mfr. Part No.7540.4801.3
BrandKopp
$79.45
Each
units
4 40 A - 30mA 400 V DIN Rail - Instantaneous - - - - - -
RS Stock No. 239-4903
Mfr. Part No.752.52801.2
BrandKopp
$88.79
Each
units
2 25 A - 30mA 230 V DIN Rail - Instantaneous - - - - - -
RS Stock No. 239-4925
Mfr. Part No.7525.4801.6
BrandKopp
$131.58
Each
units
4 25 A - 30mA 400 V DIN Rail - Instantaneous - - - - - -
RS Stock No. 825-6080
Mfr. Part No.P1RC2P63AC300
BrandLovato
$194.87
Each
units
1 + N 63 A - 300mA 230 V DIN Rail - - P1RC - - - - -
RS Stock No. 732-0067
Mfr. Part No.4 116 14
BrandLegrand
$223.62
Each
units
2 40 A - 300mA - - - - DX3 - - - - -
RS Stock No. 490-157
Mfr. Part No.236744 & PXF-25/2/003-A
BrandEaton
$117.40
Each
units
2 25 A - 30mA 230 V DIN Rail PXF - PXF-A - - - - -
RS Stock No. 732-0027
Mfr. Part No.4 115 05
BrandLegrand
$161.69
Each
units
2 40 A - 30mA 230 V - - - DX3 - - - - -
RS Stock No. 922-8620
Mfr. Part No.235413 & PFIM-40/4/05-MW
BrandEaton
$240.30
Each
units
3 + N 40 A - 500mA 230 → 400 V DIN Rail PFIM Instantaneous PFIM - - RCCB - 80mm
RS Stock No. 191-6138
Mfr. Part No.A9Y13625
$519.10
Each
units
1 + N 25 A Acti9iTG40 300mA 400 V DIN Rail Acti9 Instantaneous - - - - Type AC 91mm
RS Stock No. 179-9679
Mfr. Part No.A9V59463
$74.14
Each
units
4 63 A - 30 (Earth)mA 400 V DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - - RCD - 73.5mm
RS Stock No. 610-3773
Mfr. Part No.2CSB202101R1250 - DDA202A-25/0.03
BrandABB
$146.38
Each
units
2 25 A - 30mA 415 V DIN Rail pro M compact - DDA 200 A - - - - -
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. 732-0102
Mfr. Part No.4 116 34
BrandLegrand
$269.48
Each
units
2 25 A - 300mA 230 V - - - DX3 - - - - -
RS Stock No. 191-6134
Mfr. Part No.A9Y12640
$504.33
Each
units
1 + N 40 A Acti9iTG40 30mA 400 V DIN Rail Acti9 Instantaneous - - - - Type AC 91mm
RS Stock No. 732-0083
Mfr. Part No.4 115 55
BrandLegrand
$186.00
Each
units
2 40 A - 30mA 230 V - - - DX3 - - - - -
RS Stock No. 186-3455
Mfr. Part No.443041
BrandABB
$144.38
Each
units
1 + N 25 A FH202 AC-25/0,03 30mA - DIN Rail - Instantaneous FH200 Both Residential and Commercial, Buildings - RCD - 85mm
RS Stock No. 191-6152
Mfr. Part No.A9Y63740
$586.66
Each
units
3 40 A Acti9iDT40 300mA 400 V DIN Rail Acti9 Instantaneous - - - - Type AC 99.5mm
RS Stock No. 191-6139
Mfr. Part No.A9Y13725
$543.35
Each
units
3 25 A Acti9iTG40 300mA 400 V DIN Rail Acti9 Instantaneous - - - - Type AC 91mm
RS Stock No. 732-0011
Mfr. Part No.4 112 10
BrandLegrand
$1,132.93
Each
units
4 50 A - 300mA 400 V - - - DX3 - - - - -
RS Stock No. 179-9681
Mfr. Part No.A9V89463
$77.90
Each
units
4 63 A - 300 (Earth)mA 400 V DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - - RCD - 73.5mm
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