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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
    Eh? TPN RCBO takes up 4 (SP) ways with N sitting over one of the phases and a pigtail to the N bar.

    Well yes I've seen that too but I'm not convinced that is the maker's approved method. I have seen bus bar with a repeat period of 4 as well, but it is rare, and I cannot recall which make.


    EDIT  errata, you are quite right it is official,  Eaton do RCBOs with  fly lead and blocking one way in the next triplet 

    Mike.
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  • 0
    Eh? TPN RCBO takes up 4 (SP) ways with N sitting over one of the phases and a pigtail to the N bar.

    Well yes I've seen that too but I'm not convinced that is the maker's approved method. I have seen bus bar with a repeat period of 4 as well, but it is rare, and I cannot recall which make.


    EDIT  errata, you are quite right it is official,  Eaton do RCBOs with  fly lead and blocking one way in the next triplet 

    Mike.
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