I've got a wonderful workhorse 12 channel Sensor pack that dates from the mid 90's, and has an MPE module for control. I went digging around in the manuals and forum, but could not find anything about an MPE supporting the relay or CC modules.
Do they work? Or do I need to upgrade that rack to a CEM to get the functionality?
I do know that you will likely have to upgrade/replace the right side distro board because the original ones lacked a neutral connection needed for R20.
The CC modules will work as they are just a breaker that passes power from the mains busbar to the load side