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What is the maximum number of Add on Aux. Contacts to be installed in Masterpact ACB of type NT ?

The NT Masterpact ACB is supplied originally with a block of Aux. Contacts contains: 4 Change over contacts and maximum number is 4 Change over contacts so it can not be exceeded or increased .

On other hand the other Masterpact ACB of type NW is the same as NT but can be increased to 12 Change over Aux. Contacts .

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