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庫存編號 863-7754
製造零件編號4 115 00
BrandLegrand
HK$724.43
單位
2 16 A - 10mA 230 V - DIN Rail - - 4115 - - - -
RS庫存編號 731-9941
製造零件編號4 111 59
BrandLegrand
HK$2,147.00
單位
2 20 A - 30mA - - - - - DX3 - - - -
RS庫存編號 732-0083
製造零件編號4 115 55
BrandLegrand
HK$890.00
單位
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS庫存編號 732-0011
製造零件編號4 112 10
BrandLegrand
HK$5,400.00
單位
4 50 A - 300mA 400 V - - - - DX3 - - - -
RS庫存編號 732-0073
製造零件編號4 116 62
BrandLegrand
HK$2,688.50
單位
4 63 A - 30mA 400 V - - - - DX3 - - - -
RS庫存編號 732-0027
製造零件編號4 115 05
BrandLegrand
HK$731.50
單位
2 40 A - 30mA 230 V - - - - DX3 - - - -
RS庫存編號 731-9944
製造零件編號4 111 61
BrandLegrand
HK$2,404.34
單位
2 32 A - 30mA - - - - - DX3 - - - -
RS庫存編號 731-9929
製造零件編號4 108 14
BrandLegrand
HK$2,190.00
單位
2 20 A - 300mA - - - - - DX3 - - - -
RS庫存編號 732-0086
製造零件編號4 116 65
BrandLegrand
HK$1,540.00
單位
4 40 A - 300mA 400 V - - - - DX3 - - - -
RS庫存編號 731-9847
製造零件編號4 107 05
BrandLegrand
HK$1,610.00
單位
2 16 A - 30mA - - - - - DX3 - - - -
RS庫存編號 731-9831
製造零件編號4 107 12
BrandLegrand
HK$1,680.00
單位
2 10 A - 30mA - - - - - DX3 - - - -
RS庫存編號 732-0115
製造零件編號4 116 37
BrandLegrand
HK$902.50
單位
2 25 A - 30mA 230 V - - - - DX3 - - - -
RS庫存編號 732-0023
製造零件編號4 115 04
BrandLegrand
HK$654.50
單位
2 25 A - 30mA 230 V - - - - DX3 - - - -
RS庫存編號 731-9588
製造零件編號4 104 19
BrandLegrand
HK$1,737.00
單位
2 40 A - 300mA 400 V - - - - DX3 - - - -
RS庫存編號 732-0109
製造零件編號4 116 33
BrandLegrand
HK$1,420.00
單位
2 63 A - 30mA 230 V - - - - DX3 - - - -
RS庫存編號 732-0039
製造零件編號4 115 24
BrandLegrand
HK$1,160.00
單位
2 25 A - 300mA 230 V - - - - DX3 - - - -
RS庫存編號 732-0058
製造零件編號4 116 18
BrandLegrand
HK$1,590.00
單位
2 63 A - 30mA - - - - - DX3 - - - -
RS庫存編號 731-9966
製造零件編號4 111 86
BrandLegrand
HK$3,220.50
單位
4 16 A - 30mA 400 V - - - - DX3 - - - -
RS庫存編號 732-0042
製造零件編號4 115 26
BrandLegrand
HK$1,780.00
單位
2 63 A - 300mA 230 V - - - - DX3 - - - -
RS庫存編號 731-9957
製造零件編號4 111 72
BrandLegrand
HK$2,190.00
單位
2 16 A - 300mA - - - - - DX3 - - - -