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. 776-2843
Mfr. Part No.A9N18566
HK$7,352.50
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- 125 A - 30mA 230 → 415 V - DIN Rail Mount Acti 9 Instantaneous C120 - - - -
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Mfr. Part No.7660S
HK$791.49
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- 63 A - 300mA 230 V - DIN Rail Mount Sentry Instantaneous 7660S - - - -
RS Stock No. 790-7327
Mfr. Part No.A9D31640
HK$1,179.00
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- 40 A - 30mA 230 V - DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 734-9526
Mfr. Part No.A9N21450
HK$1,350.00
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- 25 A - 30mA 400 V - - Acti 9 - DT40 - - - -
RS Stock No. 511-9121
Mfr. Part No.ELRM44V-30
HK$1,020.05
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- 8 A - 30 → 30000mA 115 → 230 V - DIN Rail Mount - Instantaneous, Time Delay ELRM - - - -
RS Stock No. 922-8715
Mfr. Part No.PKNM-10/1N/C/003-A-MW
BrandEaton
HK$711.41
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2 10 A - 30mA 230 V - DIN Rail PKNM Instantaneous PKNM - - MCB, RCD 80mm
RS Stock No. 734-9071
Mfr. Part No.A9Q11225
HK$1,850.00
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- 25 A - 30mA 415 V - DIN Rail Mount Acti 9 Instantaneous iC60 - - - -
RS Stock No. 610-3868
Mfr. Part No.2CSB203101R1250 - DDA203A-25/0.03
BrandABB
HK$702.36
Each
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3 25 A - 30mA 415 V - DIN Rail Pro M compact - DDA 200 A - - - -
RS Stock No. 490-466
Mfr. Part No.PXF-40/4/003-A
BrandEaton
HK$340.00
Each
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4 40 A - 30mA 400 V - DIN Rail PXF - PXF-A - - - -
RS Stock No. 538-3861
Mfr. Part No.2CSF204001R3900
BrandABB
HK$1,280.00
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4 100 A - 300mA - - DIN Rail System M Pro - F200 - - - -
RS Stock No. 538-3855
Mfr. Part No.2CSF204001R1900
BrandABB
HK$1,691.41
Each
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4P 100 A - 30mA - - DIN Rail Mount System M Pro - F200 - - - -
RS Stock No. 790-9496
Mfr. Part No.A9D69640
HK$1,330.00
Each
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- 40 A - 300mA 230 V - DIN Rail, DIN Rail Mount Acti 9 - iDPN - - - -
RS Stock No. 776-3745
Mfr. Part No.A9N21462
HK$3,060.00
Each
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- 40 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 239-4903
Mfr. Part No.752.52801.2
BrandKopp
HK$351.33
Each
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2 25 A - 30mA 230 V - DIN Rail - Instantaneous - - - - -
RS Stock No. 790-7289
Mfr. Part No.A9D31616
HK$1,402.90
Each
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2 16 A - 30mA 230 V - DIN Rail Acti 9 - iDPN - - - -
RS Stock No. 863-7754
Mfr. Part No.4 115 00
BrandLegrand
HK$724.43
Each
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2 16 A - 10mA 230 V - DIN Rail - - 4115 - - - -
RS Stock No. 776-3761
Mfr. Part No.A9N21511
HK$2,796.50
Each
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- 40 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous iTG40 - - - -
RS Stock No. 776-3751
Mfr. Part No.A9N21454
HK$2,193.00
Each
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- 25 A - 30mA 230 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 776-3739
Mfr. Part No.A9N21460
HK$2,533.00
Each
units
- 25 A - 30mA 230 V, 400 V - DIN Rail Mount Acti 9 Instantaneous DT40 - - - -
RS Stock No. 825-6093
Mfr. Part No.P1RC4P25AC300
BrandLovato
HK$508.92
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4 25 A - 300mA 230 V, 400 V - DIN Rail Mount - - P1RC - - - -
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