Answer / a.s

there is a formulae for 3 ph.
p=root 3vicos0.8
by that formulae we can get nearly 35.2amps so we can put
40-50amps mcb

Answer / sujit

18*1.73*1.3=40Amp
Here we Have Consider 13% sc current.
50 Amp MCB is Not Easily Available in Market. so Better you use 63 Amps MCB.

Answer / sanjeev dadhwal

40 Amp

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