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. 922-8682
Mfr. Part No.235449 & PFIM-25/2/003-G-MW
BrandEaton
HK$1,368.22
Each
units
- 25A - 30mA 230 → 400V - DIN Rail PFIM Time Delay PFIM - RCD - 80mm
RS Stock No. 734-9551
Mfr. Part No.A9N21491
HK$2,051.66
Each
units
- 25A - 300mA 400V - - Acti 9 - iTG40 - - - -
RS Stock No. 922-8632
Mfr. Part No.235416 & PFIM-63/4/03-MW
BrandEaton
HK$1,518.90
Each
units
- 63A - 300mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - RCD - 80mm
RS Stock No. 183-3650
Mfr. Part No.450541
BrandABB
HK$3,361.67
Each
units
- 25A DDA202 30mA 400V - DIN Rail - - DDA200 - RCD - 93mm
RS Stock No. 124-7722
Mfr. Part No.5SV3344-6KK01
BrandSiemens
HK$2,621.28
Each
units
- 40A - 30mA 400V - DIN Rail Sentron Time Delay 5SV3 - RCCB - 89.8mm
RS Stock No. 732-0099
Mfr. Part No.4 116 32
BrandLegrand
HK$1,029.50
Each
units
1+N 40A - 30mA 230V - - - - DX3 - - - -
RS Stock No. 209-1348
Mfr. Part No.A9R41225
HK$1,992.13
Each
units
- - - - - - - - - - - - - -
RS Stock No. 790-9529
Mfr. Part No.A9D53610
HK$1,967.68
Each
units
- 10A - 100mA 230V - DIN Rail Acti 9 - iDPN - - - -
RS Stock No. 209-1345
Mfr. Part No.A9Q44425
HK$1,624.72
Each
units
4P 25A Acti9iC60 300mA 500V 125V DIN Rail Acti 9 Instantaneous Vigi iC60 - - - -
RS Stock No. 191-6144
Mfr. Part No.A9Y62340
HK$3,166.36
Each
units
3 40A Acti9iDT40 30mA 400V - DIN Rail Acti9 Instantaneous - - - Type AC 99.5mm
RS Stock No. 922-8620
Mfr. Part No.235413 & PFIM-40/4/05-MW
BrandEaton
HK$1,372.12
Each
units
- 40A - 500mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - RCD - 80mm
New
RS Stock No. 210-9331
Mfr. Part No.3VA9214-0RS20
BrandSiemens
HK$13,106.39
Each
units
4 250A - - 127 → 480V - Screw Mount SENTRON - 3VA911 - - - -
RS Stock No. 922-8698
Mfr. Part No.236017 & PKNM-6/1N/C/003-MW
BrandEaton
HK$932.02
Each
units
- 6A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - RCD - 80mm
RS Stock No. 191-6073
Mfr. Part No.A9DA2610
HK$1,808.56
Each
units
1+N 10A Acti9iDD40T 30mA 230V - DIN Rail Mount Acti9 Instantaneous - - - Type AC 85mm
New
RS Stock No. 220-4749
Mfr. Part No.1492-RCDA2B40
HK$1,166.70
Each
units
2 40A 1492-RCDA2B40 100mA 400V - - Allen-Bradley Instantaneous 1492-RCDA - - - -
RS Stock No. 790-9462
Mfr. Part No.A9D60625
HK$2,170.03
Each
units
- 25A - 100mA 230V - DIN Rail Acti 9 - iDPN - - - -
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. 731-9588
Mfr. Part No.4 104 19
BrandLegrand
HK$2,525.67
Each
units
1+N 40A - 300mA 400V - - - - DX3 - - - -
RS Stock No. 863-7758
Mfr. Part No.4 115 16
BrandLegrand
HK$589.92
Each
units
1+N 63A - 100mA 230V - DIN Rail - - 4115 - - - -
RS Stock No. 191-6075
Mfr. Part No.A9DA6610
HK$2,785.53
Each
units
1+N 10A Acti9iDD40T 300mA 230V - DIN Rail Acti9 Instantaneous - - - Type AC 85mm