triple poled mcb

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I simple question i'm sure but I thought i'd better check just incase. On for example a 63a triplepoled mcb, does each pole have a rating of 63A or idoes the mcb as a whole have a rating of 63A.
 
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yep, 63A per pole. just think of it as 3 single mcbs connected together by the 'switch'. a fault in one phase will disconnect all 3 conductors.
 
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