Types of Residual Current Devices (RCD)Types of Residual Current Devices (RCD)

Disassembled residual current device RCD; I=40A, I=30mADisassembled residual current device RCD; I=40A, I=30mA

RCD ClassicationsRCD ClassicationsFor domestic applications only the first five of the below listed For domestic applications only the first five of the below listed residual current devices (RCD)residual current devices (RCD) need to be considered. For industrial and commercial need to be considered. For industrial and commercialbuildings all of the classifications need to be considered.buildings all of the classifications need to be considered.

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buildings all of the classifications need to be considered.buildings all of the classifications need to be considered.

Table below aims to identify where each type of RCD can be used, together with the benefits provided. However, before looking at Table 2 there are twoTable below aims to identify where each type of RCD can be used, together with the benefits provided. However, before looking at Table 2 there are twoother classifications of RCD that need to be considered general and time-delayed operation each having Type a.c., A or B characteristics.other classifications of RCD that need to be considered general and time-delayed operation each having Type a.c., A or B characteristics.

RCCBRCCB(Residual Current Operated Circuit Breaker without Integral Overcurrent Protection)(Residual Current Operated Circuit Breaker without Integral Overcurrent Protection)

A mechanical switching device designed to make, carry and break currents under normal service conditions and to cause the opening of the contactsA mechanical switching device designed to make, carry and break currents under normal service conditions and to cause the opening of the contactswhen the residual current attains a given value under specified conditions.when the residual current attains a given value under specified conditions.

It is not designed to give protection against overloads and/or short-circuits and must always be used in conjunction with an overcurrent protective deviceIt is not designed to give protection against overloads and/or short-circuits and must always be used in conjunction with an overcurrent protective devicesuch as a fuse or circuit breaker.such as a fuse or circuit breaker.

RCBORCBO(Residual Current Operated Circuit Breaker with Integral Overcurrent Protection)(Residual Current Operated Circuit Breaker with Integral Overcurrent Protection)

A mechanical switching device designed to make, carry and break currents under normal service conditions and to cause the opening of the contactsA mechanical switching device designed to make, carry and break currents under normal service conditions and to cause the opening of the contactswhen the residual current attains a given value under specified conditions.when the residual current attains a given value under specified conditions.

In addition it is designed to give protection against overloads and/or short-circuits and can be used independently of any other overcurrent protectiveIn addition it is designed to give protection against overloads and/or short-circuits and can be used independently of any other overcurrent protectivedevice within its rated short-circuit capacity.device within its rated short-circuit capacity.

SRCDSRCD(Socket-Outlet incorporating a Residual Current Device)(Socket-Outlet incorporating a Residual Current Device)

A socket-outlet for fixed installations incorporating an integral sensing circuit that will automatically cause the switching contacts in the main circuit to openA socket-outlet for fixed installations incorporating an integral sensing circuit that will automatically cause the switching contacts in the main circuit to openat a predetermined value of residual current.at a predetermined value of residual current.

FCURCDFCURCD(Fused Connection Unit incorporating a Residual Current Device)(Fused Connection Unit incorporating a Residual Current Device)

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A fused connection unit for fixed installations incorporating an integral sensing circuit that will automatically cause the switching contacts in the main circuitA fused connection unit for fixed installations incorporating an integral sensing circuit that will automatically cause the switching contacts in the main circuitto open at a predetermined value of residual currentto open at a predetermined value of residual current

PRCDPRCD(Portable Residual Current Device)(Portable Residual Current Device)

A device comprising a plug, a residual current device and one or more socket-outlets (or a provision for connection). It may incorporate overcurrentA device comprising a plug, a residual current device and one or more socket-outlets (or a provision for connection). It may incorporate overcurrentprotection.protection.

CBRCBR(Circuit Breaker incorporating Residual Current Protection)(Circuit Breaker incorporating Residual Current Protection)

A circuit breaker providing overcurrent protection and incorporating A circuit breaker providing overcurrent protection and incorporating residual current protectionresidual current protection either integrally (an Integral CBR) or by combination with either integrally (an Integral CBR) or by combination witha residual current unit which may be factory or field fitted.a residual current unit which may be factory or field fitted.

The RCBO and CBR have the same application, both providing overcurrent and residual current protection. In general, the term RCBO isThe RCBO and CBR have the same application, both providing overcurrent and residual current protection. In general, the term RCBO isapplied to the smaller devices whereas CBR is used for devices throughout the current range, with ratings up to several thousand amperes,applied to the smaller devices whereas CBR is used for devices throughout the current range, with ratings up to several thousand amperes,single and multi-phase.single and multi-phase.

The RCBO and CBR are more strictly defined by the relevant standards.The RCBO and CBR are more strictly defined by the relevant standards.

RCMRCM(Residual Current Monitor)(Residual Current Monitor)

A device designed to monitor electrical installations or circuits for the presence of unbalanced A device designed to monitor electrical installations or circuits for the presence of unbalanced earth fault currentsearth fault currents . It does not incorporate any tripping. It does not incorporate any trippingdevice or overcurrent protection.device or overcurrent protection.

MRCDMRCD(Modular Residual Current Device)(Modular Residual Current Device)

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An independently mounted device incorporating residual current protection, without overcurrent protection, and capable of giving a signal to trip anAn independently mounted device incorporating residual current protection, without overcurrent protection, and capable of giving a signal to trip anassociated switching device.associated switching device.

Suitability of dierent types of RCD for dierent applicationsSuitability of dierent types of RCD for dierent applications

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Suitability of different types of RCD for different applicationsSuitability of different types of RCD for different applications

Application Notes:Application Notes:(1) Only if used in conjunction with suitable overcurrent protection (e.g. Fuse/circuit breaker)(1) Only if used in conjunction with suitable overcurrent protection (e.g. Fuse/circuit breaker)(2) 10 mA RCDs are associated with highly sensitive equipment and high risk areas such as school laboratories and in hospital areas(2) 10 mA RCDs are associated with highly sensitive equipment and high risk areas such as school laboratories and in hospital areas(3) Yes provided 30mA or less, but not normally used(3) Yes provided 30mA or less, but not normally used(4) With time delay(4) With time delay(5) CU Consumer unit to BS EN 60439-3(5) CU Consumer unit to BS EN 60439-3(6) Must provide double pole isolation(6) Must provide double pole isolation(7) DB Distribution Board; PB Panel Board; SB Switch Board(7) DB Distribution Board; PB Panel Board; SB Switch Board

Resource: eama The RCD Handbook | BEAMA Guide to the Selection and Application of Residual Current DevicesResource: eama The RCD Handbook | BEAMA Guide to the Selection and Application of Residual Current Devices

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MaintenanceMaintenanceand testing ofand testing ofthe overcurrentthe overcurrentprotectiveprotectivedevicesdevices

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Article Tags //Article Tags //circuit breaker, current, overcurrent, protection, rcbo, rcd, residualcircuit breaker, current, overcurrent, protection, rcbo, rcd, residualdevice,device,

Filed Under Category //Filed Under Category //Energy and Power Low VoltageEnergy and Power Low Voltage

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About Author //About Author //Edvard CsanyiEdvard CsanyiEdvardEdvard - - Electrical engineer, programmer and founder of Electrical engineer, programmer and founder of EEPEEP. Highly specialized for design of LV high power busbar. Highly specialized for design of LV high power busbartrunking (

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GeneralitiesGeneralitiesAndAndDiscriminationDiscriminationBetweenBetweenRCDs | EEPRCDs | EEPJ AN 11 , 2013JAN 11 , 2013

OvercurrentOvercurrentProtection OfProtection OfTransformerTransformer(NEC 450.3)(NEC 450.3)| EEP| EEPOCT 08 , 2012OCT 08 , 2012

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[...] performed)(1) Possible with a switch with automatic opening. (2) Possible with addition of a Residual Current Device (RCD). (3)[...] performed)(1) Possible with a switch with automatic opening. (2) Possible with addition of a Residual Current Device (RCD). (3)gG fuse onlyResource: Schneider Electric - Low voltage switches gG fuse onlyResource: Schneider Electric - Low voltage switches (adsbygoogle = [...](adsbygoogle = [...]

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[...] Devices (RCDs)Generalities on Residual Current Circuit-BreakersThe operating principle of the residual current release is[...] Devices (RCDs)Generalities on Residual Current Circuit-BreakersThe operating principle of the residual current release isbasically the detection of an earth fault current, by means of a toroid transformer which [...]basically the detection of an earth fault current, by means of a toroid transformer which [...]

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[...] [...] [...][...]

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