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. 776-3751
Mfr. Part No.A9N21454
TWD7,353.00
Each
units
- 25 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 734-9539
Mfr. Part No.A9N21473
TWD7,864.00
Each
units
- 40 A - 300mA 400 V - - Acti 9 - DT40 - - - -
RS Stock No. 776-2853
Mfr. Part No.A9N18543
TWD15,128.00
Each
units
- 125 A - 300mA 230 → 415 V - DIN Rail Mount Acti 9 Instantaneous C120 - - - -
RS Stock No. 734-9627
Mfr. Part No.A9N21452
TWD6,172.00
Each
units
- 40 A - 30mA 400 V - - Acti 9 - DT40 - - - -
RS Stock No. 432-2354
Mfr. Part No.12243
TWD3,910.00
Each
units
4 40 A - 500mA 400 V - DIN Rail Multi 9 Instantaneous PEP C60 - - - -
RS Stock No. 179-9680
Mfr. Part No.A9V69463
TWD1,661.00
Each
units
4 63 A - 100 (Earth)mA 400 V - DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - - RCD -
RS Stock No. 734-9062
Mfr. Part No.A9Q14225
TWD7,244.00
Each
units
- 25 A - 300mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
New
RS Stock No. 191-6076
Mfr. Part No.A9DA6616
TWD10,949.00
Each
units
2 16 A Acti9iDD40T 300mA 230 V ac - DIN Rail Mount Acti9 Instantaneous - - 6 kA, 4500 A - Type AC
RS Stock No. 734-9541
Mfr. Part No.A9N21481
TWD6,959.00
Each
units
- 25 A - 300mA 400 V - - Acti 9 - iTG40 - - - -
RS Stock No. 734-9591
Mfr. Part No.A9N21442
TWD6,421.00
Each
units
- 10 A - 30mA 400 V - - Acti 9 - DT40 - - - -
New
RS Stock No. 191-6144
Mfr. Part No.A9Y62340
TWD12,446.00
Each
units
3 40 A Acti9iDT40 30mA 400 V ac - DIN Rail Mount Acti9 Instantaneous - - - - Type AC
RS Stock No. 790-9456
Mfr. Part No.A9D55620
TWD6,565.00
Each
units
- 20 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous iDPN - - - -
RS Stock No. 776-2893
Mfr. Part No.A9V39263
TWD16,868.00
Each
units
- 63 A - 1A 230 V, 400 V, 415 V - DIN Rail Mount Acti 9 Time Delay iC60 - - - -
RS Stock No. 734-9210
Mfr. Part No.A9V11463
TWD18,073.00
Each
units
- 63 A - 30mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 776-2878
Mfr. Part No.A9Q01225
TWD8,096.00
Each
units
- 25 A - 30mA 130 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 734-9548
Mfr. Part No.A9N21480
TWD6,103.00
Each
units
- 25 A - 30mA 230 V - - Acti 9 - iTG40 - - - -
RS Stock No. 790-9437
Mfr. Part No.A9D38616
TWD9,848.00
Each
units
- 16 A - 30mA 230 V - DIN Rail, DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 734-9191
Mfr. Part No.A9Q14425
TWD7,938.00
Each
units
- 25 A - 300mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 181-2639
Mfr. Part No.56230
TWD10,308.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 776-2856
Mfr. Part No.A9N18542
TWD23,928.00
Each
units
- 125 A - 30mA 230 → 415 V - DIN Rail Mount Acti 9 Instantaneous C120 - - - -