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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RS Stock No. 776-2843
Mfr. Part No.A9N18566
HK$7,076.96
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Mfr. Part No.A9Q11225
HK$2,117.53
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Mfr. Part No.A9V04263
HK$3,156.86
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Mfr. Part No.A9R12440
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Mfr. Part No.A9D69640
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Mfr. Part No.A9R15480
HK$4,421.16
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Mfr. Part No.A9Y14640
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HK$1,887.48
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Mfr. Part No.A9Y12440
HK$3,393.90
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Mfr. Part No.A9Y62625
HK$1,543.30
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Mfr. Part No.A9D53610
HK$1,967.68
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Mfr. Part No.A9N21470
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1P+N 25A Acti9iC40 30mA 400V 125V DIN Rail Acti 9 Instantaneous Vigi iC40 - - - -
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Mfr. Part No.A9Q31440
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RS Stock No. 209-1357
Mfr. Part No.A9Y84625
HK$1,639.25
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1P+N 25A Acti9iC40 30mA 400V 125V DIN Rail Acti 9 Instantaneous Vigi iC40 - - - -
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Mfr. Part No.A9DA2616
HK$2,341.08
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Mfr. Part No.A9V06763
HK$1,898.99
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Mfr. Part No.A9V35463
HK$4,812.87
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