Resolution:
Yes, the FDM121 (STRV00121) is compatible with MasterPacT MTZ circuit breakers, but with the following conditions:

• To connect FDM121 to Micrologic X, firmware must be V4.00.009 or greater.
• If lower than this one, you will have to update Micrologic X with EPC.

The FDM128, catalog number LV434128 will connect with all firmware versions of Micrologic X. It connects over ethernet and will accept up to 8 inputs.
See attached for a graphic of how it connects to the MTZ.

Released for:Schneider Electric Canada