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. 806-7332
Mfr. Part No.A9R21225
SGD273.54
Each
units
2P 25 A - 30mA 240 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 806-7376
Mfr. Part No.A9R21440
SGD373.38
Each
units
4P 40 A - 30mA 415 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 806-7313
Mfr. Part No.A9R20225
SGD401.58
Each
units
2P 25 A - 10mA 240 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 511-9121
Mfr. Part No.ELRM44V-30
SGD204.54
Each
units
- 8 A - 30 → 30000mA 115 → 230 V - DIN Rail Mount - Instantaneous, Time Delay ELRM - - - -
RS Stock No. 776-8731
Mfr. Part No.A9V41225
SGD318.16
Each
units
- 25 A - 30mA 400 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 734-9185
Mfr. Part No.A9Q11325
SGD438.15
Each
units
- 25 A - 30mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 776-9103
Mfr. Part No.A9R75425
SGD116.00
Each
units
4P 25 A - 300mA 400 V, 415 V - DIN Rail Mount Acti 9 Instantaneous iIDK - - - -
RS Stock No. 776-9090
Mfr. Part No.A9R75240
SGD49.00
Each
units
DP 40 A - 300mA 230 V, 240 V - DIN Rail Mount Acti 9 Instantaneous iIDK - - - -
RS Stock No. 922-8648
Mfr. Part No.PFIM-16/2/003-A-MW
BrandEaton
SGD170.27
Each
units
2 16 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB -
RS Stock No. 806-7379
Mfr. Part No.A9R24440
SGD323.98
Each
units
4P 40 A - 300mA 415 V - DIN Rail Mount Acti 9 - iID - - - -
RS Stock No. 922-8654
Mfr. Part No.PFIM-40/2/003-A-MW
BrandEaton
SGD172.27
Each
units
2 40 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB -
RS Stock No. 667-0602
Mfr. Part No.235394
BrandEaton
SGD175.36
Each
units
2 40 A - 30mA - - - XBoard - PFIM - - - -
RS Stock No. 922-8682
Mfr. Part No.PFIM-25/2/003-G-MW
BrandEaton
SGD160.98
Each
units
2 25 A - 30mA 230 → 400 V - DIN Rail PFIM Time Delay PFIM - - RCCB -
RS Stock No. 776-2865
Mfr. Part No.A9N18548
SGD1,269.73
Each
units
- 125 A - 300mA 230 → 415 V - DIN Rail Mount Acti 9 Time Delay C120 - - - -
RS Stock No. 776-8747
Mfr. Part No.A9V41240
SGD223.10
Each
units
- 40 A - 30mA 400 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 922-8591
Mfr. Part No.PFIM-16/2/001-MW
BrandEaton
SGD166.04
Each
units
2 16 A - 10mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB -
RS Stock No. 922-8749
Mfr. Part No.PKNM-25/1N/C/003-MW
BrandEaton
SGD160.77
Each
units
2 25 A - 30mA 230 V - DIN Rail PKNM Instantaneous PKNM - - MCB, RCD -
RS Stock No. 667-0605
Mfr. Part No.235390
BrandEaton
SGD150.01
Each
units
2 25 A - 30mA - - DIN Rail XBoard - PFIM - - - -
RS Stock No. 776-3751
Mfr. Part No.A9N21454
SGD346.48
Each
units
- 25 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 806-7348
Mfr. Part No.A9R21263
SGD335.62
Each
units
2P 63 A - 30mA 240 V - DIN Rail Mount Acti 9 - iID - - - -
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