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Friday, 23 May 2014

Difference FAQ between ELCB, RCCB, RCBO and RCD

Residual Current Circuit Breaker I was looking at, "Google Webmaster Tools," relating to this blogsite and noted that there was a very large number of queries which followed the format of: "difference between blah and blah" which related to an article I wrote What are ELCB, RCCB, RCBO and RCD's?.

While I didn't specifically write my previous post as a direct comparison, I can understand why it appears to be popular for this particular type of comparison query, as it contains an explanation of what these components are. I thought in this post I would give a brief direct explanation for that particular query type, which also includes a specific link to the original previous post for a clearer understanding of the components.  As this is intended as a pithy article I have assumed that you understand what the various acronyms mean. If you don't know what the acronyms mean then hit the included link and go to the original article for a clear explanation.





Contents.


What is the:

~ difference between ELCB and RCCB?

~ difference between RCCB and ELCB?

~ difference between RCCB and RCBO?

~ difference between RCBO and RCCB?

~ difference between ELCB and RCBO?

~ difference between RCBO and ELCB?

~ difference between RCD,  RCCB and RCBO?








Difference between ELCB and RCCB?



The term ELCB is now a defunct term. The ELCB originally came as two options. One was the voltage operated ELCB or VOELCB, which is now obsolete due to some serious shortcomings. The second type was the current operated ELCB.  The latter was renamed and has now become the commonly available RCCB.  So essentially the difference between the ELCB and the RCCB is just the name rather than the operation.  The acronym RCCB more accurately represents how it works.



Difference between RCCB and ELCB?



Please see the explanation for, "difference between elcb and rccb?"



Difference between RCCB and RCBO?






Both of these units are normally found in the fuse box, more commonly knows as a consumer unit (CU) or breaker panel.  The RCCB will only detect current leakage from a circuit it monitors. The RCBO can detect both the current leakage and overcurrent conditions from the circuit it monitors.  The RCBO detects overcurrent in the same way as an MCB does.  The RCBO is commonly used as an MCB replacement in the consumer unit as the detection electronics allows for a much smaller form factor than the RCCB.  In this scenario and RCBO will only switch the Live conductor but it still needs a circuit connection to both the Live and Neutral conductors to allow the residual current leakage detection.

Technologically RCCB are much older simpler and is tried and trusted technology. The RCBO is newer technology part utilising a built in microcontroller.  Although commonly used as an MCB replacement it can have options to switch multiple poles allowing it to be used with 3 phase supplies.  So essentially the difference between the RCCB and the RCBO is the RCBO offers additional overload protection.



Difference between RCBO and RCCB?



Please see the explanation for, "difference between rccb and rcbo?"



Difference between ELCB and RCBO?



As the ELCB is technically an RCCB, please see the answer to, "difference between rccb and rcbo?"



Difference between RCBO and ELCB?



Similar to the answer to the previous question:  As the ELCB is technically an RCCB, please see the answer to, "difference between rccb and rcbo?"



Difference between RCD, RCCB and RCBO?



Essentially RCD covers the technology or "residual current detection", which means that in reality both the RCCB and the RCBO are subsets of the RCD technology.  More commonly the term RCD is referenced to devices which detect residual current but are not fitted into the fuse box, or consumer unit. This includes fitted surface mount sockets and inline plugs.  The RCCB and the RCBO are fitted in the consumer unit.  For an explanation of the difference between a RCCB and RCBO please see my answer to, "difference between rccb and rcbo?"





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