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. 191-6140
Mfr. Part No.A9Y14463
HK$7,574.54
Each
units
- - - - - - - - - - - - - -
RS Stock No. 863-7773
Mfr. Part No.4 115 55
BrandLegrand
HK$1,120.17
Each
units
1 + N 40 A - 30mA 230 V - DIN Rail - - 4115 - - - -
RS Stock No. 825-6090
Mfr. Part No.P1RC4P40AC300
BrandLovato
HK$834.82
Each
units
3 + N 40 A - 300mA 230 V, 400 V - DIN Rail - - P1RC - - - -
New
RS Stock No. 210-9327
Mfr. Part No.3VA9213-0RS20
BrandSiemens
HK$11,338.76
Each
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3 250A - - 127 → 480V - Screw Mount SENTRON - 3VA911 - - - -
RS Stock No. 776-2907
Mfr. Part No.A9V39363
HK$5,005.67
Each
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- 63A - - 400 V, 415V - DIN Rail Mount Acti 9 Time Delay iC60 - - - -
RS Stock No. 734-9208
Mfr. Part No.A9Q11240
HK$2,164.11
Each
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- - - - - - - - - - - - - -
RS Stock No. 731-9878
Mfr. Part No.4 107 99
BrandLegrand
HK$2,161.65
Each
units
2 6 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 124-7735
Mfr. Part No.5SV3346-6KL
BrandSiemens
HK$2,803.01
Each
units
- 63A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - - - RCCB
RS Stock No. 124-7721
Mfr. Part No.5SV3344-6
BrandSiemens
HK$638.10
Each
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- 40A 5SV33446 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - - - RCCB
RS Stock No. 183-3550
Mfr. Part No.167898 | FRCDM-63/4/03-G/B
BrandMoeller
HK$6,257.79
Each
units
- 63A - 300mA 240V 220V DIN Rail FRCdM Time Delay FRCDM - - 630 A RCD
RS Stock No. 734-9191
Mfr. Part No.A9Q14425
HK$2,064.69
Each
units
- - - - - - - - - - - - - -
RS Stock No. 776-2881
Mfr. Part No.A9V14263
HK$2,887.84
Each
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- - - - - - - - - - - - - -
RS Stock No. 183-3655
Mfr. Part No.452053
BrandABB
HK$2,233.23
Each
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- 40A DDA204 300mA 400V - DIN Rail - - DDA200 - - - RCD
RS Stock No. 732-0017
Mfr. Part No.4 111 90
BrandLegrand
HK$3,735.77
Each
units
4 40 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 732-0099
Mfr. Part No.4 116 32
BrandLegrand
HK$824.94
Each
units
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 731-9960
Mfr. Part No.4 111 87
BrandLegrand
HK$3,248.01
Each
units
4 20 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 922-8664
Mfr. Part No.235439 & PFIM-40/4/003-A-MW
BrandEaton
HK$1,164.46
Each
units
- 40A - 30mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - - - RCCB
RS Stock No. 179-9677
Mfr. Part No.A9V69440
HK$268.19
Each
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- - - - - - - - - - - - - -
RS Stock No. 667-0618
Mfr. Part No.235399 & PFIM-63/2/01-MW
BrandEaton
HK$966.11
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-9672
Mfr. Part No.A9V59340
HK$179.19
Each
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