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Is it possible to fit new design MCH to old NW Breaker.

The MCH are fully compatible. 
In new MCH , the MCH coupling profile on the axis of the CB changed to facilitate its adjustment from "triangular" to "circular". 
To proceed with the adaptation of a spare MCH in a Masterpact it´s necesary to follow the directions of the MCH instruction Sheet. 
In the attached document (Spanish language) the most important points are given for correct adjustment: 
1st CB in Open position (OFF) and with discharged springs 
2nd MCH Profile faced with the notch (see doc) 
3rd To facilitate engagement we can slightly rotate the MCH. 
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