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庫存編號 124-7734
製造零件編號5SV3346-6
BrandSiemens
HK$2,027.40
單位
- 63A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
全新
RS庫存編號 210-9286
製造零件編號3VA9113-0RS20
BrandSiemens
HK$10,850.37
單位
3 160A - - 127 → 480V - Screw Mount SENTRON Time Delayed 3VA911 - - - -
RS庫存編號 124-7735
製造零件編號5SV3346-6KL
BrandSiemens
HK$2,911.34
單位
- 63A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
全新
RS庫存編號 218-1854
製造零件編號3VA9423-0RL30
BrandSiemens
HK$14,932.69
單位
3 160A 3VA24 - 690V 100V - SENTRON - 3VA24 - - - -
RS庫存編號 124-7727
製造零件編號5SV3312-6
BrandSiemens
HK$521.04
單位
- 25A 5SV33126 30mA 230V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 35.8 x 77.2 x 89.8mm
全新
RS庫存編號 210-9331
製造零件編號3VA9214-0RS20
BrandSiemens
HK$13,106.39
單位
4 250A - - 127 → 480V - Screw Mount SENTRON - 3VA911 - - - -
全新
RS庫存編號 210-9375
製造零件編號3VA9324-0RL30
BrandSiemens
HK$16,221.84
單位
4 400A - - 100 → 690V - Screw Mount SENTRON - 3VA911 - - - -
RS庫存編號 124-7740
製造零件編號5SV3642-6KL
BrandSiemens
HK$1,003.39
單位
- 25A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 200-6017
製造零件編號5SV3642-4
BrandSiemens
HK$7,982.01
單位
- - - - - - - - - - - - - -
RS庫存編號 200-6020
製造零件編號5SV3647-4
BrandSiemens
HK$14,717.83
單位
- - - - - - - - - - - - - -
RS庫存編號 200-6013
製造零件編號5SV3342-4
BrandSiemens
HK$8,830.70
單位
- - - - - - - - - - - - - -
RS庫存編號 124-7739
製造零件編號5SV3642-6
BrandSiemens
HK$1,003.39
單位
- 25A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 124-7724
製造零件編號5SV3347-6KK12
BrandSiemens
HK$9,453.79
單位
- 80A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
全新
RS庫存編號 218-1795
製造零件編號3VA9114-0RL21
BrandSiemens
HK$17,296.13
單位
4 160A 3VA11 - 690V 127V - SENTRON - 3VA11 - - - -
RS庫存編號 124-7723
製造零件編號5SV3344-6KK12
BrandSiemens
HK$1,278.41
單位
- 40A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 124-7744
製造零件編號5SV3646-6KK12
BrandSiemens
HK$1,315.82
單位
- 63A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 124-7742
製造零件編號5SV3644-6KK12
BrandSiemens
HK$1,278.41
單位
- 40A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 124-7745
製造零件編號5SV3646-6KL
BrandSiemens
HK$1,546.98
單位
- 63A - 300mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 124-7736
製造零件編號5SV3444-6
BrandSiemens
HK$1,697.38
單位
- 40A - 100mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm
RS庫存編號 124-7731
製造零件編號5SV3342-6
BrandSiemens
HK$793.46
單位
- 25A - 30mA 400V - DIN Rail Sentron Instantaneous 5SV3 - RCCB 89.8mm 71.8 x 77.2 x 89.8mm