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. 200-6015
Mfr. Part No.5SV3347-4
BrandSiemens
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Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 203-9036
Mfr. Part No.236966 & PXK-C25/1N/003-A
BrandEaton
HK$1,599.58
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1 25 A PXK-C25/1N/003-A 30mA 240 V ac - DIN PXK - PXK - - - -
New
RS Stock No. 210-3515
Mfr. Part No.3VA9124-0RL30
BrandSiemens
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4 160A 3VA9124-0RL30 - - - Screw Mount SENTRON - 3VA9 - - - -
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Mfr. Part No.A9V02763
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RS Stock No. 922-8733
Mfr. Part No.236245 & PKNM-20/1N/C/003-MW
BrandEaton
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- 20A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - - - -
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Mfr. Part No.5SV3642-4
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Mfr. Part No.P1RC4P40AC030
BrandLovato
HK$945.46
Each
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3 + N 40 A - 30mA 230 V, 400 V - DIN Rail - - P1RC - - - -
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Mfr. Part No.A9V03663
HK$1,673.57
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BrandLegrand
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3 + N 63 A - 30mA 400 V - DIN Rail - - 4117 - - - -
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Mfr. Part No.235443 & PFIM-63/4/003-A-MW
BrandEaton
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- 63A - 30mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - - - RCCB
RS Stock No. 732-0089
Mfr. Part No.4 116 66
BrandLegrand
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4 63 A - 300mA 400 V - - - - DX3 - - - -
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Mfr. Part No.4 107 12
BrandLegrand
HK$1,703.64
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2 10 A - 30mA - - - - - DX3 - - - -
RS Stock No. 922-8737
Mfr. Part No.236249 & PKNM-20/1N/C/003-A-MW
BrandEaton
HK$729.16
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- 20A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - - - -
RS Stock No. 183-3554
Mfr. Part No.167905 & FRCDM-40/4/03-G/BFQ
BrandEaton
HK$6,038.88
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RS Stock No. 922-8660
Mfr. Part No.235437 & PFIM-25/4/03-A-MW
BrandEaton
HK$1,124.78
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- 25A - 300mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - - - RCCB
RS Stock No. 732-0077
Mfr. Part No.4 116 64
BrandLegrand
HK$1,485.44
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4 25 A - 300mA 400 V - - - - DX3 - - - -
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RS Stock No. 209-1354
Mfr. Part No.A9Y82625
HK$1,155.14
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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.A9N18543
HK$3,934.95
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RS Stock No. 825-6090
Mfr. Part No.P1RC4P40AC300
BrandLovato
HK$834.82
Each
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3 + N 40 A - 300mA 230 V, 400 V - DIN Rail - - P1RC - - - -