That is a 3 phase, 12 pole supply with 27mm spcaing. It will supply up to 4x 3 pole breakers.
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The part code is C125123
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Code = A9N18511 3 pole, 15kA, 63A, (27mm wide)
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No - for 160 , will need to use NSX160, depth = 126mm MCB maximum size 125A
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The terminal cable size for C120 MCB IS 50 mm². square
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