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Why is it not possible to have a built in motor mechanism for Compact NS630 LB and NS800 LB Circuit Breakers.

The basic frames of the Compact NS630b LB and NS800 LB Circuit Breakers have been modified as compared to the basic frame for the other Circuit Breakers N, H & L.
 
These modifications do not allow the adaptation of the motor mechanism in Compact NS630b LB and NS800 LB Circuit Breakers.
 
The modification done on the LB version is given in the attached file.
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