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RCBO In Distribution Board or Isolator With RCD?

I'm trying to decide which would be the most suitable and sensible option?

I have a Control Board that will be switching 4x 3-Phase Immersion Elements.

9kW

9kW

6kW

3kW

Control Board has Rail Mount Fuse Holders & Contactors installed for each circuit.

My question is would it be better to have a suitably rated RCBO installed in the Distribution Board which will be feeding the Control Board or should I go with downstream Isolators with RCD's? I'm leaning towards the later as I would have separate RCD protection on each circuit.

Look forward to your feedback. Cheers, Dan.

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0 Nano Brewery over 3 years ago

Then what are the operational requirements? Is it acceptable to the user to have all the immersions disconnected if one developed a fault? (if they're all part of the same process that might actually be perfectly acceptable or even desirable, in other situations keeping the others running at all costs might be top of the list).

I would need the other 3 Immersions to remain connected if 1 develops a fault.
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0 Nano Brewery over 3 years ago

Then what are the operational requirements? Is it acceptable to the user to have all the immersions disconnected if one developed a fault? (if they're all part of the same process that might actually be perfectly acceptable or even desirable, in other situations keeping the others running at all costs might be top of the list).

I would need the other 3 Immersions to remain connected if 1 develops a fault.
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RCBO In Distribution Board or Isolator With RCD?

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