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Three Phase RCD & MCB Wiring?

Nano Brewery
Please could somebody advise on the most cost effective procedure of wiring up RCDs & MCBs on a DIN Rail for independent circuit protection.  Tried Googling to no joy.  Plenty of Single Phase advice, images, videos.  If using 4 Pole MCBs & RCDs, would I be correct in assuming that similar to single phase, it's just a case of Busbar-ing the MCB Lives to the RCD Lives and taking the RCD to Neutral Bar?


Have seen diagrams (like below) where the Incoming L1, L2, L3 get split to separate DP MCBs, RCDs and SP MCBs for each phase.  Seems like a bit of a faff and a pricey option (3x DP MCBs + 3x RCDs + 3x SP MCBs) per circuit.


I have 3x Three Phase Circuits (13A, 40A, 48A) that I wish to protect independently with RCDs.


Thanks in advance!  Dan.

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  • 0
    Nano Brewery:
    Chris Pearson:

    Is this a re-hash of previous threads?


    On the face of it, you simple use an RCBO for each circuit, but as JP says, this is a job for a skilled person.


    Hi Chris, I don't think it's a re-hash???...


    The previous thread was to understand if RCCBs were required?


    This thread is to try and understand how 4 Pole RCCBs and 4 or 3 Pole MCBs are wired up on the DIN Rail? 


    Is it even possible?  Or do you have to go the pricey RCBO option?




    IIRC, the option of having an RCD incomer was discussed.


    It isn't a matter of working out how to connect a confection of different devices.


    I dare say that there are plenty of folk out there who will design you an appropriate installation. You may have more difficulty in finding somebody who will do it's initial verification.


    So if I brought you some half-brewed beer and asked you to finish it off and bottle it, what response would I get?


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  • 0
    Nano Brewery:
    Chris Pearson:

    Is this a re-hash of previous threads?


    On the face of it, you simple use an RCBO for each circuit, but as JP says, this is a job for a skilled person.


    Hi Chris, I don't think it's a re-hash???...


    The previous thread was to understand if RCCBs were required?


    This thread is to try and understand how 4 Pole RCCBs and 4 or 3 Pole MCBs are wired up on the DIN Rail? 


    Is it even possible?  Or do you have to go the pricey RCBO option?




    IIRC, the option of having an RCD incomer was discussed.


    It isn't a matter of working out how to connect a confection of different devices.


    I dare say that there are plenty of folk out there who will design you an appropriate installation. You may have more difficulty in finding somebody who will do it's initial verification.


    So if I brought you some half-brewed beer and asked you to finish it off and bottle it, what response would I get?


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