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. 922-8727
Mfr. Part No.236212 & PKNM-16/1N/C/003-MW
BrandEaton
SGD154.54
Each
units
1 + N 16 A - 30mA 230 V - DIN Rail PKNM Instantaneous PKNM - - MCB, RCD -
RS Stock No. 776-3701
Mfr. Part No.A9R12440
SGD364.59
Each
units
- 40 A - 100mA 400 V, 415 V - DIN Rail Mount Acti 9 Instantaneous iID - - - -
RS Stock No. 538-3861
Mfr. Part No.2CSF204001R3900
BrandABB
SGD459.51
Each
units
4 100 A - 300mA - - DIN Rail System M Pro - F200 - - - -
RS Stock No. 922-8673
Mfr. Part No.235440 & PFIM-40/4/01-A-MW
BrandEaton
SGD208.35
Each
units
3 + N 40 A - 100mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB -
RS Stock No. 776-9116
Mfr. Part No.A9R75440
SGD67.30
Each
units
4P 40 A - 300mA 400 V, 415 V - DIN Rail Mount Acti 9 Instantaneous iIDK - - - -
RS Stock No. 776-9093
Mfr. Part No.A9R75225
SGD78.00
Each
units
DP 25 A - 300mA 230 V, 240 V - DIN Rail Mount Acti 9 Instantaneous iIDK - - - -
RS Stock No. 176-807
Mfr. Part No.2CCL562111E0165 - FS401E-B16/0.03
BrandABB
SGD185.66
Each
units
2 16 A - 30mA 230 V - - SmiSSline - FS401 - - - -
RS Stock No. 806-7288
Mfr. Part No.A9R12291
SGD362.71
Each
units
2P 100 A - 100mA 240 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 734-9204
Mfr. Part No.A9Q14440
SGD365.90
Each
units
- 40 A - 300mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 790-7302
Mfr. Part No.A9D31625
SGD211.22
Each
units
- 25 A - 30mA 230 V - DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 922-8617
Mfr. Part No.235398 & PFIM-63/2/003-MW
BrandEaton
SGD178.91
Each
units
1 + N 63 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB -
RS Stock No. 806-7317
Mfr. Part No.A9R41425
SGD239.24
Each
units
4P 25 A - 30mA 415 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 776-2843
Mfr. Part No.A9N18566
SGD1,163.38
Each
units
- 125 A - 30mA 230 → 415 V - DIN Rail Mount Acti 9 Instantaneous C120 - - - -
RS Stock No. 776-8734
Mfr. Part No.A9V12225
SGD156.30
Each
units
- 25 A - 100mA 230 V, 400 V, 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 734-9217
Mfr. Part No.A9Q11340
SGD450.58
Each
units
- 40 A - 30mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 124-7725
Mfr. Part No.5SV3111-6
BrandSiemens
SGD200.22
Each
units
1 + N 16 A - 10mA 230 V - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB -
RS Stock No. 776-3691
Mfr. Part No.A9R12240
SGD297.05
Each
units
- 40 A - 100mA 230 V, 240 V - DIN Rail Mount Acti 9 Instantaneous iID - - - -
RS Stock No. 610-3521
Mfr. Part No.2CSB204101R4630 - DDA204 A-63/0,5
BrandABB
SGD232.55
Each
units
4 63 A - 500mA 415 V - DIN Rail pro M compact - DDA 200 A - - - -
RS Stock No. 922-8702
Mfr. Part No.236067 & PKNM-10/1N/B/003-MW
BrandEaton
SGD153.20
Each
units
1 + N 10 A - 30mA 230 V - DIN Rail PKNM Instantaneous PKNM - - MCB, RCD -
RS Stock No. 538-3855
Mfr. Part No.2CSF204001R1900
BrandABB
SGD459.51
Each
units
4P 100 A - 30mA - - DIN Rail Mount System M Pro - F200 - - - -
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