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 Earth Leakage Protection Type Overall Depth
RS Stock No. 183-3548
Mfr. Part No.167897 & FRCDM-40/4/03-G/B
BrandEaton
HK$5,995.75
Each
units
4P 40A - 300mA 240V 220V DIN Rail FRCdM Time Delay FRCDM 500 A RCD - 80mm
RS Stock No. 776-2847
Mfr. Part No.A9N18567
HK$3,341.03
Each
units
- 125A - 300mA 230 → 415V - DIN Rail Mount Acti 9 Instantaneous C120 - - - -
RS Stock No. 863-7764
Mfr. Part No.4 117 61
BrandLegrand
HK$1,153.03
Each
units
3+N 63A - 30mA 400V - DIN Rail - - 4117 - - - -
RS Stock No. 825-6080
Mfr. Part No.P1RC2P63AC300
BrandLovato
HK$1,042.70
Each
units
1+N 63A - 300mA 230V - DIN Rail - - P1RC - - - -
RS Stock No. 610-3521
Mfr. Part No.2CSB204101R4630 - DDA204 A-63/0,5
BrandABB
HK$1,469.21
Each
units
3+N 63A - 500mA 415V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 191-6147
Mfr. Part No.A9Y62725
HK$2,497.97
Each
units
3 25A Acti9iDT40 30mA 400V - DIN Rail Mount Acti9 Instantaneous - - - Type AC 99.5mm
RS Stock No. 179-9694
Mfr. Part No.A9N18571
HK$1,097.17
Each
units
4 125A - 500mA 415V - DIN Rail Mount Acti 9 Instantaneous Vigi C120 - RCD - 73mm
RS Stock No. 490-040
Mfr. Part No.236730 & PXF-16/2/003-A
BrandEaton
HK$1,025.35
Each
units
1+N 16A - 30mA 230V - DIN Rail PXF - PXF-A 500 A - - 45mm
RS Stock No. 179-9676
Mfr. Part No.A9V59440
HK$281.15
Each
units
4 40A - 30mA 400V - DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - RCD - 73.5mm
RS Stock No. 731-9875
Mfr. Part No.4 108 00
BrandLegrand
HK$3,110.08
Each
units
1+N 10A - 30mA 230V - - - - DX3 - - - -
RS Stock No. 209-1341
Mfr. Part No.A9Q41225
HK$1,199.74
Each
units
2P 25A Acti9iC60 30mA 500V 125V DIN Rail Acti 9 Instantaneous Vigi iC60 - - - -
RS Stock No. 922-8695
Mfr. Part No.236012 & PKNM-6/1N/B/003-A-MW
BrandEaton
HK$1,123.96
Each
units
- 6A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - RCD - 80mm
RS Stock No. 732-0011
Mfr. Part No.4 112 10
BrandLegrand
HK$7,579.14
Each
units
3+N 50A - 300mA 400V - - - - DX3 - - - -
RS Stock No. 124-7742
Mfr. Part No.5SV3644-6KK12
BrandSiemens
HK$1,296.98
Each
units
- 40A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB - 89.8mm
RS Stock No. 124-7736
Mfr. Part No.5SV3444-6
BrandSiemens
HK$1,722.03
Each
units
- 40A - 100mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB - 89.8mm
RS Stock No. 201-0755
Mfr. Part No.CPR100003
BrandContactum
HK$757.07
Each
units
- - - - - - - - - - - - - -
RS Stock No. 201-0759
Mfr. Part No.CPR100030T
BrandContactum
HK$803.03
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-7745
Mfr. Part No.5SV3646-6KL
BrandSiemens
HK$1,569.45
Each
units
- 63A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB - 89.8mm
RS Stock No. 124-7730
Mfr. Part No.5SV3314-6KK12
BrandSiemens
HK$1,144.39
Each
units
- 40A - 30mA 230V - DIN Rail Sentron Instantaneous 5SV3 - RCCB - 89.8mm
RS Stock No. 776-2900
Mfr. Part No.A9Q31325
HK$3,709.46
Each
units
- 25A - 30mA 400 V, 415V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -