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Select Protection Devices

K M Thilakarathne

There are 2 devices in the market as a  RCD or  RCCB are installed for electrical circuit SELECT PROTECTION DIVICEs  for earth leakage protection  - what is the difference of its and what is most suitable for the human protection device 

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    RCD = Residual Current Device - that's a generic term for any protective device that includes a residual current element.

    RCCB = Residual Current Circuit Breaker - a specific device that contain a residual current element only - it has no other protective elements, such as for overcurrent.

    then there are others, such as:

    RCBO = Residual Current Breaker with Overcurrent -  a device with both residual and overcurrent protection elements.

    and MCB = Miniature Circuit Breaker - a device with overcurrent but no residual current protection elements.

    So where there's a requirement for RCD protection it could be satisfied by either an RCCB or an RCBO for example (or perhaps an MCCB+residual trip).

    It gets a bit confusing because some suppliers (and occasionally common usage) label RCCBs as RCDs - which isn't entirely wrong since RCCBs technically are RCDs, but does muddy the water somewhat. It'll get muddier still as new device (e.g. AFDDs) come in which usually contain RCD elements too.

       - Andy.

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    RCD = Residual Current Device - that's a generic term for any protective device that includes a residual current element.

    RCCB = Residual Current Circuit Breaker - a specific device that contain a residual current element only - it has no other protective elements, such as for overcurrent.

    then there are others, such as:

    RCBO = Residual Current Breaker with Overcurrent -  a device with both residual and overcurrent protection elements.

    and MCB = Miniature Circuit Breaker - a device with overcurrent but no residual current protection elements.

    So where there's a requirement for RCD protection it could be satisfied by either an RCCB or an RCBO for example (or perhaps an MCCB+residual trip).

    It gets a bit confusing because some suppliers (and occasionally common usage) label RCCBs as RCDs - which isn't entirely wrong since RCCBs technically are RCDs, but does muddy the water somewhat. It'll get muddier still as new device (e.g. AFDDs) come in which usually contain RCD elements too.

       - Andy.

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