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 Circuit Breaker Type Earth Leakage Protection Type
RS Stock No. 610-3868
Mfr. Part No.2CSB203101R1250 - DDA203A-25/0.03
BrandABB
HK$817.50
Each
units
3 25 A - 30mA 415 V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 538-3861
Mfr. Part No.2CSF204001R3900
BrandABB
HK$2,635.79
Each
units
4 100 A - 300mA - - DIN Rail System M Pro - F200 - - - -
RS Stock No. 538-3855
Mfr. Part No.2CSF204001R1900
BrandABB
HK$2,635.76
Each
units
4P 100 A - 30mA - - DIN Rail Mount System M Pro - F200 - - - -
RS Stock No. 186-3467
Mfr. Part No.444161
BrandABB
HK$1,432.76
Each
units
2 63 A FH202 S A-63/0,03 30mA - - DIN Rail Mount - Instantaneous FH200 Domestic - RCD -
RS Stock No. 183-3635
Mfr. Part No.442061
BrandABB
HK$3,063.58
Each
units
4 63 A F204 30mA 400 V - DIN Rail - - FH200 Domestic - RCD -
RS Stock No. 183-3784
Mfr. Part No.452367
BrandABB
HK$13,265.80
Each
units
4 40 A DDA204 30mA - - DIN Rail - - DDA200 Industrial, Tertiary - RCD -
RS Stock No. 186-3465
Mfr. Part No.444061
BrandABB
HK$1,187.59
Each
units
2 63 A FH202 S AC-63/0,03 30mA - - DIN Rail Mount - Instantaneous FH200 Domestic - RCD -
RS Stock No. 186-3460
Mfr. Part No.443161
BrandABB
HK$1,274.83
Each
units
2 63 A FH202 A-63/0,03 30mA - - DIN Rail Mount - Instantaneous FH200 Both Residential and Commercial, Buildings - RCD -
RS Stock No. 183-3654
Mfr. Part No.452043
BrandABB
HK$2,030.12
Each
units
4 25 A DDA204 300mA 400 V - DIN Rail - - DDA200 Commercial, Industrial, Residential - RCD -
RS Stock No. 183-3639
Mfr. Part No.442151
BrandABB
HK$2,496.68
Each
units
4 40 A F204 30mA 400 V - DIN Rail - - FH200 Domestic - RCD -
RS Stock No. 183-3651
Mfr. Part No.452041
BrandABB
HK$2,504.38
Each
units
4 25 A DDA204 30mA 400 V - DIN Rail - - DDA200 Commercial, Industrial, Residential - RCD -
RS Stock No. 183-3638
Mfr. Part No.442043
BrandABB
HK$1,563.91
Each
units
4 25 A F204 300mA 400 V - DIN Rail - - FH200 Domestic - RCD -
RS Stock No. 183-3655
Mfr. Part No.452053
BrandABB
HK$2,233.23
Each
units
4 40 A DDA204 300mA 400 V - DIN Rail - - DDA200 Commercial, Industrial, Residential - RCD -
RS Stock No. 183-3656
Mfr. Part No.452063
BrandABB
HK$3,119.67
Each
units
4 63 A DDA204 300mA 400 V - DIN Rail - - DDA200 Commercial, Industrial, Residential - RCD -
RS Stock No. 610-3773
Mfr. Part No.2CSB202101R1250 - DDA202A-25/0.03
BrandABB
HK$743.60
Each
units
2 25 A - 30mA 415 V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 610-3442
Mfr. Part No.2CSB204101R1250 - DDA204A-25/0,03
BrandABB
HK$891.40
Each
units
4 25 A - 30mA 415 V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 186-3457
Mfr. Part No.443061
BrandABB
HK$1,068.28
Each
units
2 63 A FH202 AC-63/0,03 30mA - - DIN Rail Mount - Instantaneous FH200 Both Residential and Commercial, Buildings - RCD -
RS Stock No. 183-3647
Mfr. Part No.450040
BrandABB
HK$2,755.64
Each
units
2 25 A DDA202 10mA 400 V - DIN Rail - - DDA200 Commercial, Industrial, Residential - RCD -
RS Stock No. 186-3466
Mfr. Part No.444151
BrandABB
HK$924.60
Each
units
2 40 A FH202 S A-40/0,03 30mA - - DIN Rail Mount - Instantaneous FH200 Domestic - RCD -
RS Stock No. 183-3653
Mfr. Part No.452061
BrandABB
HK$4,838.07
Each
units
4 63 A DDA204 30mA 400 V - DIN Rail - - DDA200 Commercial, Industrial, Residential - RCD -