How to add new software packages and/or hardware modules to an existing REX640 protection relay?

[@vaha1990]

Is it possible to change the hardware such as the x120, I have AIM0006 and i want to replace it with AIM0003 on a REG615.

[@ABBlearning]

Hello @vaha1990. Please contact your local ABB service representative to grant the applicability of the replacement.