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 Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type
RS Stock No. 124-7741
Mfr. Part No.5SV3644-6
BrandSiemens
TWD3,669.00
Each
units
- 40A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - - - RCCB
RS Stock No. 511-9121
Mfr. Part No.ELRM44V-30 115/230VAC
TWD4,326.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 776-3751
Mfr. Part No.A9N21454
TWD7,745.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-7742
Mfr. Part No.5SV3644-6KK12
BrandSiemens
TWD4,769.00
Each
units
- 40A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - - - RCCB
RS Stock No. 731-9944
Mfr. Part No.4 111 61
BrandLegrand
TWD12,304.00
Each
units
2 32 A - 30mA - - - - - DX3 - - - -
RS Stock No. 922-8601
Mfr. Part No.235392 & PFIM-25/2/03-MW
BrandEaton
TWD2,993.00
Each
units
- 25A - 300mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - - - RCCB
RS Stock No. 922-8642
Mfr. Part No.235424 & PFIM-25/2/003-A-MW
BrandEaton
TWD3,728.00
Each
units
- 25A - 30mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - - - RCCB
RS Stock No. 734-9507
Mfr. Part No.A9N21445
TWD8,055.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 667-0620
Mfr. Part No.235403 & PFIM-80/2/01-MW
BrandEaton
TWD4,650.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 734-9529
Mfr. Part No.A9N21451
TWD7,098.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 863-7764
Mfr. Part No.4 117 61
BrandLegrand
TWD4,106.00
Each
units
3 + N 63 A - 30mA 400 V - DIN Rail - - 4117 - - - -
RS Stock No. 922-8715
Mfr. Part No.236082 & PKNM-10/1N/C/003-A-MW
BrandEaton
TWD3,115.00
Each
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- 10A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - - - -
RS Stock No. 191-6145
Mfr. Part No.A9Y62625
TWD7,938.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 731-9948
Mfr. Part No.4 111 71
BrandLegrand
TWD11,434.00
Each
units
2 10 A - 300mA - - - - - DX3 - - - -
RS Stock No. 825-6071
Mfr. Part No.P1RC2P25AC300
BrandLovato
TWD2,509.00
Each
units
1 + N 25 A - 300mA 230 V - DIN Rail Mount - - P1RC - - - -
RS Stock No. 776-3761
Mfr. Part No.A9N21511
TWD9,815.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 610-3773
Mfr. Part No.2CSB202101R1250 - DDA202A-25/0.03
BrandABB
TWD2,873.00
Each
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2 25 A - 30mA 415 V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 201-0755
Mfr. Part No.CPR100003
BrandContactum
TWD2,666.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 776-2929
Mfr. Part No.A9V31463
TWD25,235.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 790-9487
Mfr. Part No.A9D69632
TWD7,770.00
Each
units
- - - - - - - - - - - - - -