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 Overall Depth
RS Stock No. 776-2843
Mfr. Part No.A9N18566
HK$7,352.50
Each
units
- 125 A - 30mA 230 → 415 V - DIN Rail Mount Acti 9 Instantaneous C120 - - - -
RS Stock No. 790-7327
Mfr. Part No.A9D31640
HK$1,179.00
Each
units
- 40 A - 30mA 230 V - DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 734-9526
Mfr. Part No.A9N21450
HK$1,350.00
Each
units
- 25 A - 30mA 400 V - - Acti 9 - DT40 - - - -
RS Stock No. 734-9071
Mfr. Part No.A9Q11225
HK$1,850.00
Each
units
- 25 A - 30mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 790-7346
Mfr. Part No.A9D44620
HK$1,270.00
Each
units
- 20 A - 300mA 230 V - DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 776-3745
Mfr. Part No.A9N21462
HK$3,060.00
Each
units
- 40 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 776-3739
Mfr. Part No.A9N21460
HK$2,533.00
Each
units
- 25 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 790-9496
Mfr. Part No.A9D69640
HK$1,330.00
Each
units
- 40 A - 300mA 230 V - DIN Rail, DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 776-3742
Mfr. Part No.A9N21461
HK$2,201.50
Each
units
- 25 A - 300mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 776-3751
Mfr. Part No.A9N21454
HK$2,193.00
Each
units
- 25 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 776-2890
Mfr. Part No.A9V04263
HK$3,289.50
Each
units
- 63 A - 300mA 130 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 776-3701
Mfr. Part No.A9R12440
HK$2,312.00
Each
units
- 40 A - 100mA 400 V, 415 V - DIN Rail Mount Acti 9 Instantaneous iID - - - -
RS Stock No. 776-3764
Mfr. Part No.A9N21474
HK$3,255.50
Each
units
- 25 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 776-3711
Mfr. Part No.A9R15480
HK$5,250.00
Each
units
- 80 A - 300mA 400 V, 415 V - DIN Rail Mount Acti 9 Time Delay iID - - - -
RS Stock No. 776-3789
Mfr. Part No.A9N21486
HK$2,541.50
Each
units
- 40 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous iTG40 - - - -
RS Stock No. 776-3761
Mfr. Part No.A9N21511
HK$2,796.50
Each
units
- 40 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous iTG40 - - - -
RS Stock No. 790-7289
Mfr. Part No.A9D31616
HK$1,402.90
Each
units
2 16 A - 30mA 230 V - DIN Rail Acti 9 - iDPN - - - -
RS Stock No. 734-9548
Mfr. Part No.A9N21480
HK$1,510.50
Each
units
- 25 A - 30mA 230 V - - Acti 9 - iTG40 - - - -
RS Stock No. 734-9062
Mfr. Part No.A9Q14225
HK$1,770.00
Each
units
- 25 A - 300mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 734-9551
Mfr. Part No.A9N21491
HK$1,738.50
Each
units
- 25 A - 300mA 400 V - - Acti 9 - iTG40 - - - -