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 Breaking Capacity at Maximum Voltage Rating Circuit Breaker Type Overall Depth Overall Dimensions
RS Stock No. 610-3802
Mfr. Part No.2CSB202101R3250 - DDA202A-25/0.3
BrandABB
MYR499.84
Each
units
2 25 A - 300mA 415 V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 667-0602
Mfr. Part No.235394 & PFIM-40/2/003-MW
BrandEaton
MYR644.19
Each
units
- - - - - - - - - - - - - -
RS Stock No. 731-9979
Mfr. Part No.4 111 88
BrandLegrand
MYR2,866.34
Each
units
4 25 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 667-0611
Mfr. Part No.235395 & PFIM-40/2/01-MW
BrandEaton
MYR579.67
Each
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- - - - - - - - - - - - - -
RS Stock No. 490-157
Mfr. Part No.236744 & PXF-25/2/003-A
BrandEaton
MYR221.96
Each
units
- - - - - - - - - - - - - -
RS Stock No. 734-9532
Mfr. Part No.A9N21470
MYR1,501.45
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- - - - - - - - - - - - - -
RS Stock No. 863-7767
Mfr. Part No.4 117 02
BrandLegrand
MYR402.39
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3 + N 25 A - 30mA 400 V - DIN Rail - - 4117 - - - -
RS Stock No. 734-9201
Mfr. Part No.A9Q11440
MYR1,635.40
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- - - - - - - - - - - - - -
RS Stock No. 734-9696
Mfr. Part No.A9V15463
MYR2,123.08
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- - - - - - - - - - - - - -
RS Stock No. 124-7741
Mfr. Part No.5SV3644-6
BrandSiemens
MYR600.55
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MYR576.82
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MYR591.07
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MYR3,525.04
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RS Stock No. 922-8639
Mfr. Part No.235414 & PFIM-63/4/003-MW
BrandEaton
MYR983.16
Each
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- 63A - 30mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - RCCB 80mm 70 x 65.5 x 80mm
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Mfr. Part No.A9V41240
MYR847.43
Each
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- - - - - - - - - - - - - -
RS Stock No. 922-8711
Mfr. Part No.236077 & PKNM-10/1N/C/003-MW
BrandEaton
MYR544.42
Each
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- 10A - 30mA 230V - DIN Rail PKNM Instantaneous PKNM - - 80mm 35 x 65.5 x 80mm
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Mfr. Part No.A9Q11340
MYR1,700.85
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RS Stock No. 178-263
Mfr. Part No.2CSF502110R1250
BrandABB
MYR596.12
Each
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- - - - - - - - - - - - - -
RS Stock No. 922-8658
Mfr. Part No.235429 & PFIM-40/2/03-A-MW
BrandEaton
MYR644.19
Each
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- 40A - 300mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - RCCB 80mm 35 x 65.5 x 80mm
RS Stock No. 922-8645
Mfr. Part No.235420 & PFIM-80/4/03-MW
BrandEaton
MYR1,402.39
Each
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- 80A - 300mA 230 → 400V - DIN Rail PFIM Instantaneous PFIM - RCCB 80mm 70 x 65.5 x 80mm