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We have an NSX C. breaker Reference: LV431770 and we need to change the trip unit with reference TMD : LV431430 ? Can we do this change and is it valid for all compact ranges NSX ?

All trip units for Compact NSX MCCB range are interchangeable, without wiring. A mechanical mismatch-protection system makes it impossible to mount a trip unit on a circuit breaker with a lower rating. 

The below link is an instruction sheet for the trip unit showing how a trip unit can be installed. At the same time, it would be very useful if you downloaded a video illustrating how to uninstall a trip unit through the following link: https://schneider-electric.box.com/shared/static/2jn5lrtsrkkd4jrm5arx.m1v
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