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. 863-7758
Mfr. Part No.4 115 16
BrandLegrand
SGD82.92
Each
units
1 + N 63 A - 100mA 230 V - DIN Rail - - 4115 - - - -
RS Stock No. 863-7751
Mfr. Part No.4 115 06
BrandLegrand
SGD101.57
Each
units
1 + N 63 A - 30mA 230 V - DIN Rail - - 4115 - - - -
RS Stock No. 863-7754
Mfr. Part No.4 115 00
BrandLegrand
SGD162.70
Each
units
- 16A - 10mA 230V - DIN Rail - - 4115 - - - -
RS Stock No. 731-9944
Mfr. Part No.4 111 61
BrandLegrand
SGD560.82
Each
units
2 32 A - 30mA - - - - - DX3 - - - -
RS Stock No. 732-0051
Mfr. Part No.4 116 10
BrandLegrand
SGD177.22
Each
units
2 25 A - 30mA - - - - - DX3 - - - -
RS Stock No. 732-0027
Mfr. Part No.4 115 05
BrandLegrand
SGD173.11
Each
units
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 863-7760
Mfr. Part No.4 117 04
BrandLegrand
SGD177.33
Each
units
3 + N 63 A - 30mA 400 V - DIN Rail - - 4117 - - - -
RS Stock No. 863-7776
Mfr. Part No.4 115 07
BrandLegrand
SGD104.05
Each
units
1 + N 80 A - 30mA 230 V - DIN Rail - - 4115 - - - -
RS Stock No. 731-9960
Mfr. Part No.4 111 87
BrandLegrand
SGD805.24
Each
units
4 20 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 731-9847
Mfr. Part No.4 107 05
BrandLegrand
SGD385.82
Each
units
2 16 A - 30mA - - - - - DX3 - - - -
RS Stock No. 731-9887
Mfr. Part No.4 107 85
BrandLegrand
SGD514.05
Each
units
2 16 A - 30mA - - - - - DX3 - - - -
RS Stock No. 732-0106
Mfr. Part No.4 116 35
BrandLegrand
SGD160.43
Each
units
2 40 A - 300mA 230 V - - - - DX3 - - - -
RS Stock No. 732-0049
Mfr. Part No.4 116 17
BrandLegrand
SGD205.85
Each
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2 40 A - 30mA - - - - - DX3 - - - -
RS Stock No. 731-9840
Mfr. Part No.4 107 04
BrandLegrand
SGD397.69
Each
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2 10 A - 30mA - - - - - DX3 - - - -
RS Stock No. 732-0039
Mfr. Part No.4 115 24
BrandLegrand
SGD183.25
Each
units
2 25 A - 300mA 230 V - - - - DX3 - - - -
RS Stock No. 731-9843
Mfr. Part No.4 107 13
BrandLegrand
SGD385.82
Each
units
2 16 A - 30mA - - - - - DX3 - - - -
RS Stock No. 732-0118
Mfr. Part No.4 116 38
BrandLegrand
SGD199.85
Each
units
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 731-9972
Mfr. Part No.4 111 89
BrandLegrand
SGD829.17
Each
units
4 32 A - 30mA 400 V - - - - DX3 - - - -
RS Stock No. 732-0109
Mfr. Part No.4 116 33
BrandLegrand
SGD215.93
Each
units
2 63 A - 30mA 230 V - - - - DX3 - - - -
RS Stock No. 863-7764
Mfr. Part No.4 117 61
BrandLegrand
SGD194.42
Each
units
3 + N 63 A - 30mA 400 V - DIN Rail - - 4117 - - - -