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.

...
Read more Read less

Filters

Viewing 41 - 60 of 378 products
Results per page
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. 731-9972
Mfr. Part No.4 111 89
BrandLegrand
HK$4,876.22
Each
units
4 32 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 922-8733
Mfr. Part No.236245 & PKNM-20/1N/C/003-MW
BrandEaton
HK$1,103.05
Each
units
- 20A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - - 80mm 35 x 65.5 x 80mm
RS Stock No. 176-807
Mfr. Part No.2CCL562111E0165 - FS401E-B16/0.03
BrandABB
HK$1,122.43
Each
units
2 16 A - 30mA 230 V - - SmiSSline - FS401 - - - -
RS Stock No. 183-3784
Mfr. Part No.452367
BrandABB
HK$13,981.88
Each
units
- 40A DDA204 30mA - - DIN Rail - - DDA200 - RCD 93mm -
New
RS Stock No. 209-1342
Mfr. Part No.A9Q41425
HK$2,233.72
Each
units
4P 25A Acti9iC60 30mA 500V 125V DIN Rail Acti 9 Instantaneous Vigi iC60 - - - -
RS Stock No. 806-7373
Mfr. Part No.A9V39263
HK$2,244.26
Each
units
2P 63A - - 240V - DIN Rail Mount Acti 9 - iC60 - - - -
RS Stock No. 186-3455
Mfr. Part No.443041
BrandABB
HK$735.85
Each
units
- 25A FH202 AC-25/0,03 30mA - - DIN Rail - Instantaneous FH200 - RCD 85mm -
RS Stock No. 732-0017
Mfr. Part No.4 111 90
BrandLegrand
HK$5,098.60
Each
units
4 40 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 776-2907
Mfr. Part No.A9V39363
HK$5,215.16
Each
units
- 63A - - 400 V, 415V - DIN Rail Mount Acti 9 Time Delay iC60 - - - -
New
RS Stock No. 210-9286
Mfr. Part No.3VA9113-0RS20
BrandSiemens
HK$10,850.37
Each
units
3 160A - - 127 → 480V - Screw Mount SENTRON Time Delayed 3VA911 - - - -
RS Stock No. 124-7735
Mfr. Part No.5SV3346-6KL
BrandSiemens
HK$2,911.34
Each
units
- 63A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS Stock No. 922-8623
Mfr. Part No.235408 & PFIM-25/4/03-MW
BrandEaton
HK$998.26
Each
units
- 25A - 300mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - RCCB 80mm 70 x 65.5 x 80mm
RS Stock No. 201-0759
Mfr. Part No.CPR100030T
BrandContactum
HK$798.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 734-9551
Mfr. Part No.A9N21491
HK$2,038.79
Each
units
- - - - - - - - - - - - - -
RS Stock No. 734-9204
Mfr. Part No.A9Q14440
HK$2,349.66
Each
units
- - - - - - - - - - - - - -
RS Stock No. 790-9456
Mfr. Part No.A9D55620
HK$1,768.75
Each
units
- - - - - - - - - - - - - -
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 - - - -
New
RS Stock No. 218-1854
Mfr. Part No.3VA9423-0RL30
BrandSiemens
HK$14,932.69
Each
units
3 160A 3VA24 - 690V 100V - SENTRON - 3VA24 - - - -
RS Stock No. 124-7727
Mfr. Part No.5SV3312-6
BrandSiemens
HK$521.04
Each
units
- 25A 5SV33126 30mA 230V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 35.8 x 77.2 x 89.8mm
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 - - - -