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. 776-8762
Mfr. Part No.A9V12425
£312.24
Each
Units
- 25 A - 100mA 400 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 863-7760
Mfr. Part No.4 117 04
BrandLegrand
£95.07
Each
Units
4 63 A - 30mA 400 V - DIN Rail - - 4117 - - - -
RS Stock No. 510-6838
Mfr. Part No.19039
£641.98
Each
Units
3 125 A - 30mA 415 V - DIN Rail Multi 9 Instantaneous Vigi NG125 - - - -
RS Stock No. 124-7733
Mfr. Part No.5SV3344-6KL
BrandSiemens
£57.18
Each
Units
4 40 A - 30mA 400 V ac - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB 89.8mm
RS Stock No. 922-8733
Mfr. Part No.PKNM-20/1N/C/003-MW
BrandEaton
£82.87
Each
Units
2 20 A - 30mA 230 V - DIN Rail PKNM Instantaneous PKNM - - MCB, RCD 80mm
RS Stock No. 490-191
Mfr. Part No.236774
BrandEaton
£66.58
Each
Units
4 25 A - 300mA 400 V - DIN Rail PXF - PXF-A - - - -
RS Stock No. 124-7732
Mfr. Part No.5SV3342-6KK12
BrandSiemens
£79.85
Each
Units
4 25 A - 30mA 400 V ac - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB 89.8mm
RS Stock No. 490-062
Mfr. Part No.PXF-40/2/003-A
BrandEaton
£61.25
Each
Units
2 40 A - 30mA 230 V - DIN Rail PXF - PXF-A - - - -
RS Stock No. 922-8664
Mfr. Part No.PFIM-40/4/003-A-MW
BrandEaton
£110.64
Each
Units
4 40 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB 80mm
RS Stock No. 124-7729
Mfr. Part No.5SV3314-6
BrandSiemens
£92.60
Each
Units
2 40 A - 30mA 230 V ac - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB 89.8mm
RS Stock No. 825-6093
Mfr. Part No.P1RC4P25AC300
BrandLovato
£51.58
Each
Units
4 25 A - 300mA 230 V, 400 V - DIN Rail Mount - - P1RC - - - -
RS Stock No. 922-8617
Mfr. Part No.PFIM-63/2/003-MW
BrandEaton
£89.28
Each
Units
2 63 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB 80mm
RS Stock No. 731-9966
Mfr. Part No.4 111 86
BrandLegrand
£299.88
Each
Units
4 16 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 790-9459
Mfr. Part No.A9D55616
£137.74
Each
Units
- 16 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous iDPN - - - -
RS Stock No. 826-3335
Mfr. Part No.7840S
£53.50
Each
Units
2 40 A - 30mA 230 V - DIN Rail Sentry Selective 7840S - - - -
RS Stock No. 922-8642
Mfr. Part No.PFIM-25/2/003-A-MW
BrandEaton
£82.90
Each
Units
2 25 A - 30mA 230 → 400 V - DIN Rail PFIM Instantaneous PFIM - - RCCB 80mm
RS Stock No. 610-3521
Mfr. Part No.2CSB204101R4630 - DDA204 A-63/0,5
BrandABB
£113.44
Each
Units
4 63 A - 500mA 415 V - DIN Rail pro M compact - DDA 200 A - - - -
RS Stock No. 124-7734
Mfr. Part No.5SV3346-6
BrandSiemens
£199.53
Each
Units
4 63 A - 30mA 400 V ac - DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB 89.8mm
RS Stock No. 667-0624
Mfr. Part No.235410
BrandEaton
£99.44
Each
Units
4 40 A - 30mA - - DIN Rail XBoard - PFIM - - - -
RS Stock No. 610-3408
Mfr. Part No.2CSB203101R3630 - DDA203A-63/0,3
BrandABB
£105.61
Each
Units
3 63 A - 300mA 415 V - DIN Rail pro M compact - DDA 200 A - - - -
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