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MCB & Cable Size for 3 Phase Star (Wye) with Neutral

Nano Brewery
Hi, I'm trying to understand/figure out what MCB & Cable Size would be required for a 3 Phase 9kW Immersion Element wired in Star using Neutral?  I have been a little confused by the results when using various online calculators. One example here: https://www.watlow.com/resources-and-support/engineering-tools/3phase-delta-wye-calculator

i.e. Using a Line Voltage of 400V equals a Phase & Line Current of 12.99A.  Where as using a Phase Voltage of 230V equals a Phase & Line Current of 22.59A?


My questions are:

1. Are these calculations correct?

2. What Amperage MCB would be required?

3. Would the MCB required need to be 3P, 3P+N or 4P?

3. Would 1.5mm2 cable at a 6 meter run be adequate?


Thanks in advance for your feedback and help.
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  • 0
    A well made 16A model or a cheap and cheerful 20A are about the same internally. Either would do. Avoid the cheapest of the cheap from no name internet sites -  when it comes to decently made contacts and solid mechanical parts you tend to get what you pay for. Do you need the kind you can lock off for maintenance and does it need to be safe with wet hands  ?

    (example )
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  • 0
    A well made 16A model or a cheap and cheerful 20A are about the same internally. Either would do. Avoid the cheapest of the cheap from no name internet sites -  when it comes to decently made contacts and solid mechanical parts you tend to get what you pay for. Do you need the kind you can lock off for maintenance and does it need to be safe with wet hands  ?

    (example )
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