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. 732-0051
Mfr. Part No.4 116 10
BrandLegrand
SGD139.89
Each
units
2 25 A - 30mA - - - - - DX3 - - - -
RS Stock No. 176-879
Mfr. Part No.2CCF544310E0630 - F404A-K63/0.03,2CC
BrandABB
SGD433.18
Each
units
4 63 A - 30mA 400 V - - SmiSSline Instantaneous F404 - - - -
RS Stock No. 734-9627
Mfr. Part No.A9N21452
SGD275.06
Each
units
- 40 A - 30mA 400 V - - Acti 9 - DT40 - - - -
RS Stock No. 776-2878
Mfr. Part No.A9Q01225
SGD360.82
Each
units
- 25 A - 30mA 130 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 124-7741
Mfr. Part No.5SV3644-6
BrandSiemens
SGD162.74
Each
units
3 + N 40 A - 300mA 400 V - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB -
RS Stock No. 825-6080
Mfr. Part No.P1RC2P63AC300
BrandLovato
SGD169.95
Each
units
1 + N 63 A - 300mA 230 V - DIN Rail - - P1RC - - - -
RS Stock No. 178-257
Mfr. Part No.2CCF544110E0250 - F404A-25/0.03, 2CC
BrandABB
SGD224.74
Each
units
4 25 A - 30mA 400 V - - SmiSSline Instantaneous F404 - - - -
RS Stock No. 178-263
Mfr. Part No.2CSF502110R1250
BrandABB
SGD167.75
Each
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2 25 A - 30mA 230 V - - SmiSSline Instantaneous F402 - - - -
RS Stock No. 806-7323
Mfr. Part No.A9R26463
SGD374.73
Each
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4P 63 A - 500mA 415 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 922-8743
Mfr. Part No.236279 & PKNM-25/1N/C/003-A-MW
BrandEaton
SGD138.83
Each
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1 + N 25 A - 30mA 230 V - DIN Rail PKNM Instantaneous PKNM - - MCB, RCD -
RS Stock No. 124-7729
Mfr. Part No.5SV3314-6
BrandSiemens
SGD99.91
Each
units
1 + N 40 A - 30mA 230 V - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB -
RS Stock No. 812-9556
SGD89.68
Each
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2P 63 A - 30mA 240 V - DIN Rail Mount Domae Instantaneous DOM - - - -
RS Stock No. 178-099
Mfr. Part No.2CCL562110E0165 - FS401M-B16/0.03
BrandABB
SGD238.54
Each
units
2 16 A - 30mA 230 V - - SmiSSline - FS401 - - - -
RS Stock No. 922-8686
Mfr. Part No.235461 & PFIM-40/2/03-S-MW
BrandEaton
SGD203.86
Each
units
1 + N 40 A - 300mA 230 → 400 V - DIN Rail PFIM Time Delay PFIM - - RCCB -
RS Stock No. 922-8642
Mfr. Part No.235424 & PFIM-25/2/003-A-MW
BrandEaton
SGD183.32
Each
units
1 + N 25 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB -
RS Stock No. 732-0027
Mfr. Part No.4 115 05
BrandLegrand
SGD133.16
Each
units
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 776-3711
Mfr. Part No.A9R15480
SGD703.95
Each
units
- 80 A - 300mA 400 V, 415 V - DIN Rail Mount Acti 9 Time Delay iID - - - -
RS Stock No. 610-3773
Mfr. Part No.2CSB202101R1250 - DDA202A-25/0.03
BrandABB
SGD127.04
Each
units
2 25 A - 30mA 415 V - DIN Rail pro M compact - DDA 200 A - - - -
RS Stock No. 731-9847
Mfr. Part No.4 107 05
BrandLegrand
SGD277.03
Each
units
2 16 A - 30mA - - - - - DX3 - - - -
RS Stock No. 776-2922
Mfr. Part No.A9V35463
SGD824.56
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- 63 A - 300mA 400 V, 415 V - DIN Rail Mount Acti 9 Time Delay iC60 - - - -
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