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 Overall Depth Overall Dimensions
RS Stock No. 863-7758
Mfr. Part No.4 115 16
BrandLegrand
HK$584.96
Each
units
1 + N 63 A - 100mA 230 V - DIN Rail - - 4115 - - - -
RS Stock No. 732-0112
Mfr. Part No.4 116 39
BrandLegrand
HK$1,991.74
Each
units
2 63 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 201-0759
Mfr. Part No.CPR100030T
BrandContactum
HK$798.00
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 218-8690
Mfr. Part No.1492-RCDA4A25-US
HK$1,184.82
Each
units
4 25A 1492-RCDA4A25-US 30mA 230 V, 400 V 110V - 1492-RCD Residual Current Devices - 1492-RCDA - - - -
RS Stock No. 432-2354
Mfr. Part No.12243
HK$1,053.38
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3+N 40A - 500mA 400V - DIN Rail Multi 9 Instantaneous PEP C60 - - - -
RS Stock No. 731-9916
Mfr. Part No.4 108 13
BrandLegrand
HK$3,075.70
Each
units
2 16 A - 300mA - - - - - DX3 - - - -
RS Stock No. 183-3552
Mfr. Part No.167902 & FRCDM-63/4/03-S/B
BrandEaton
HK$13,455.98
Each
units
- 63A - 300mA 240V 220V DIN Rail FRCdM - FRCDM 630 A RCD 80mm 70 x 76 x 80mm
RS Stock No. 179-9674
Mfr. Part No.A9V89340
HK$233.21
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 219-9022
Mfr. Part No.A9N18591
HK$10,291.95
Each
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2 125A - 30mA 415V - - - - - - - - -
RS Stock No. 734-9204
Mfr. Part No.A9Q14440
HK$2,349.66
Each
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- - - - - - - - - - - - - -
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Mfr. Part No.A9Y12640
HK$1,839.14
Each
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- - - - - - - - - - - - - -
New
RS Stock No. 210-9291
Mfr. Part No.3VA9114-0RS20
BrandSiemens
HK$11,817.23
Each
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4 160A - - 127 → 480V - Screw Mount SENTRON - 3VA911 - - - -
RS Stock No. 731-9935
Mfr. Part No.4 108 16
BrandLegrand
HK$3,087.52
Each
units
2 32 A - 300mA - - - - - DX3 - - - -
RS Stock No. 732-0115
Mfr. Part No.4 116 37
BrandLegrand
HK$1,254.78
Each
units
2 25 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 825-6100
Mfr. Part No.P1RC4P63AC030
BrandLovato
HK$1,813.46
Each
units
3 + N 63 A - 30mA 230 V, 400 V - DIN Rail - - P1RC - - - -
New
RS Stock No. 218-8692
Mfr. Part No.1492-RCDA4A40-US
HK$1,490.12
Each
units
4 40A 1492-RCDA4A40-US 30mA 230 V, 400 V 110V - 1492-RCD Residual Current Devices - 1492-RCDA - - - -
RS Stock No. 734-9706
Mfr. Part No.A9V19463
HK$4,333.33
Each
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- 63A - - 415V - DIN Rail Mount Acti 9 - iC60 - - - -
RS Stock No. 731-9890
Mfr. Part No.4 107 86
BrandLegrand
HK$2,923.15
Each
units
2 20 A - 30mA - - - - - DX3 - - - -
RS Stock No. 732-0027
Mfr. Part No.4 115 05
BrandLegrand
HK$1,018.00
Each
units
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 667-0608
Mfr. Part No.235391 & PFIM-25/2/01-MW
BrandEaton
HK$912.85
Each
units
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