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 Application Breaking Capacity Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type
RS Stock No. 732-0061
Mfr. Part No.4 116 60
BrandLegrand
HK$1,740.40
Each
units
4 25 A - 30mA 400 V - - - - DX3 - - - -
New
RS Stock No. 209-1356
Mfr. Part No.A9Y83625
HK$1,065.54
Each
units
1P+N 25A Acti9iC40 300mA 400V 125V DIN Rail Acti 9 Instantaneous Vigi iC40 - - - -
RS Stock No. 731-9966
Mfr. Part No.4 111 86
BrandLegrand
HK$3,259.10
Each
units
4 16 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 825-6078
Mfr. Part No.P1RC2P40AC300
BrandLovato
HK$780.32
Each
units
1 + N 40 A - 300mA 230 V - DIN Rail - - P1RC - - - -
RS Stock No. 732-0039
Mfr. Part No.4 115 24
BrandLegrand
HK$1,178.55
Each
units
2 25 A - 300mA 230 V - - - - DX3 - - - -
RS Stock No. 124-7732
Mfr. Part No.5SV3342-6KK12
BrandSiemens
HK$872.10
Each
units
- 25A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - - - RCCB
RS Stock No. 186-3466
Mfr. Part No.444151
BrandABB
HK$902.60
Each
units
- 40A FH202 S A-40/0,03 30mA - - DIN Rail - Instantaneous FH200 - - - RCD
RS Stock No. 667-0608
Mfr. Part No.235391 & PFIM-25/2/01-MW
BrandEaton
HK$804.80
Each
units
- - - - - - - - - - - - - -
RS Stock No. 183-3651
Mfr. Part No.452041
BrandABB
HK$2,444.77
Each
units
- 25A DDA204 30mA 400V - DIN Rail - - DDA200 - - - RCD
RS Stock No. 667-0605
Mfr. Part No.235390 & PFIM-25/2/003-MW
BrandEaton
HK$899.78
Each
units
- - - - - - - - - - - - - -
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