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 Rated DC Voltage Mounting Style Range Break Time Series Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Overall Depth Overall Dimensions
RS Stock No. 731-9859
Mfr. Part No.4 107 14
BrandLegrand
MYR1,290.74
Each
units
2 20 A - 30mA - - - - - DX3 - - - -
RS Stock No. 731-9865
Mfr. Part No.4 107 16
BrandLegrand
MYR1,443.59
Each
units
2 32 A - 30mA - - - - - DX3 - - - -
RS Stock No. 667-0627
Mfr. Part No.235402 & PFIM-80/2/003-MW
BrandEaton
MYR749.59
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-8693
Mfr. Part No.1492-RCDA4A63-US
MYR1,025.12
Each
units
4 63A 1492-RCDA4A63-US 30mA 230 V, 400 V 110V - 1492-RCD Residual Current Devices - 1492-RCDA - - - -
RS Stock No. 732-0070
Mfr. Part No.4 116 61
BrandLegrand
MYR1,456.85
Each
units
4 40 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 179-9678
Mfr. Part No.A9V89440
MYR171.27
Each
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- - - - - - - - - - - - - -
New
RS Stock No. 209-1357
Mfr. Part No.A9Y84625
MYR805.09
Each
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1P+N 25A Acti9iC40 30mA 400V 125V DIN Rail Acti 9 Instantaneous Vigi iC40 - - - -
RS Stock No. 734-9706
Mfr. Part No.A9V19463
MYR2,456.11
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- 63A - - 415V - DIN Rail Mount Acti 9 - iC60 - - - -
RS Stock No. 191-6137
Mfr. Part No.A9Y12740
MYR1,965.34
Each
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- - - - - - - - - - - - - -
RS Stock No. 188-1685
Mfr. Part No.P1RC4P40B300
BrandLovato
MYR4,017.66
Each
units
- - - - - - DIN Rail - - - - - - -
RS Stock No. 124-7723
Mfr. Part No.5SV3344-6KK12
BrandSiemens
MYR751.47
Each
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- 40A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS Stock No. 731-9881
Mfr. Part No.4 108 01
BrandLegrand
MYR1,695.34
Each
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2 16 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 179-9672
Mfr. Part No.A9V59340
MYR130.60
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- - - - - - - - - - - - - -
RS Stock No. 200-6013
Mfr. Part No.5SV3342-4
BrandSiemens
MYR4,212.39
Each
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- - - - - - - - - - - - - -
RS Stock No. 179-9679
Mfr. Part No.A9V59463
MYR219.19
Each
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- - - - - - - - - - - - - -
RS Stock No. 776-2843
Mfr. Part No.A9N18566
MYR4,159.97
Each
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- - - - - - - - - - - - - -
RS Stock No. 667-0608
Mfr. Part No.235391 & PFIM-25/2/01-MW
BrandEaton
MYR536.59
Each
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- - - - - - - - - - - - - -
RS Stock No. 183-3654
Mfr. Part No.452043
BrandABB
MYR1,257.76
Each
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- 25A DDA204 300mA 400V - DIN Rail - - DDA200 - RCD 93mm -
RS Stock No. 191-6132
Mfr. Part No.A9Y12440
MYR1,531.65
Each
units
- - - - - - - - - - - - - -
RS Stock No. 203-9036
Mfr. Part No.236966 & PXK-C25/1N/003-A
BrandEaton
MYR995.70
Each
units
1 25 A PXK-C25/1N/003-A 30mA 240 V ac - DIN PXK - PXK - - - -