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 Mounting Style Range Break Time Series Application Breaking Capacity Circuit Breaker Type Earth Leakage Protection Type Overall Depth
RS Stock No. 432-2354
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$209.44
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Mfr. Part No.A9V69340
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3 40 A - 100 (Earth)mA 400 V DIN Rail Mount Acti 9 Instantaneous Vigi iC65 ELE - - RCD - 73.5mm
RS Stock No. 731-9938
Mfr. Part No.4 111 57
BrandLegrand
$474.97
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2 10 A - 30mA - - - - DX3 - - - - -
RS Stock No. 490-030
Mfr. Part No.236726 & PXF-16/2/001-A
BrandEaton
$200.01
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2 16 A - 10mA 230 V DIN Rail PXF - PXF-A - - - - -
RS Stock No. 731-9871
Mfr. Part No.4 107 83
BrandLegrand
$497.66
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2 6 A - 30mA - - - - DX3 - - - - -
RS Stock No. 610-3830
Mfr. Part No.2CSB202101R4250 - DDA202A-25/0,5
BrandABB
$165.34
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2 25 A - 500mA 415 V DIN Rail pro M compact - DDA 200 A - - - - -
RS Stock No. 124-7721
Mfr. Part No.5SV3344-6
BrandSiemens
$278.50
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3 + N 40 A 5SV33446 30mA 400 V DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB - 89.8mm
RS Stock No. 191-6141
Mfr. Part No.A9Y14640
$651.22
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1 + N 40 A Acti9iTG40 30mA 230 V DIN Rail Mount Acti9 Instantaneous - - - - - 91mm
RS Stock No. 790-9507
Mfr. Part No.A9D42606
$283.60
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- 6 A - 300mA 230 V DIN Rail, DIN Rail Mount Acti 9 - iDPN - - - - -
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Mfr. Part No.4 116 37
BrandLegrand
$211.00
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2 25 A - 30mA 230 V - - - DX3 - - - - -
RS Stock No. 922-8620
Mfr. Part No.235413 & PFIM-40/4/05-MW
BrandEaton
$240.30
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3 + N 40 A - 500mA 230 → 400 V DIN Rail PFIM Instantaneous PFIM - - RCCB - 80mm
RS Stock No. 790-9484
Mfr. Part No.A9D55640
$351.67
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- 40 A - 30mA 230 V DIN Rail Mount Acti 9 Instantaneous iDPN - - - - -
RS Stock No. 731-9972
Mfr. Part No.4 111 89
BrandLegrand
$728.04
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4 32 A - 30mA 400 V - - - DX3 - - - - -
RS Stock No. 538-3855
Mfr. Part No.2CSF204001R1900
BrandABB
$545.09
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4P 100 A - 30mA - DIN Rail Mount System M Pro - F200 - - - - -
RS Stock No. 178-257
Mfr. Part No.2CCF544110E0250 - F404A-25/0.03, 2CC
BrandABB
$270.59
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4 25 A - 30mA 400 V - SmiSSline Instantaneous F404 - - - - -
RS Stock No. 191-6144
Mfr. Part No.A9Y62340
$666.68
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3 40 A Acti9iDT40 30mA 400 V DIN Rail Acti9 Instantaneous - - - - Type AC 99.5mm
RS Stock No. 124-7738
Mfr. Part No.5SV3614-6
BrandSiemens
$196.50
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1 + N 40 A - 300mA 230 V DIN Rail Sentron Instantaneous 5SV3 Industrial, Non-Residential, Residential - RCCB - 89.8mm
RS Stock No. 191-6150
Mfr. Part No.A9Y63625
$516.81
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1 + N 25 A Acti9iDT40 300mA 230 V DIN Rail Mount Acti9 Instantaneous - - - - Type AC 91mm
RS Stock No. 732-0055
Mfr. Part No.4 116 11
BrandLegrand
$169.86
Each
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2 40 A - 30mA - - - - DX3 - - - - -
RS Stock No. 490-466
Mfr. Part No.236776 & PXF-40/4/003-A
BrandEaton
$105.26
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4 40 A - 30mA 400 V DIN Rail PXF - PXF-A - - - - -
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