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What does the suffix TMT mean when added to the Catalog Number of a Low Voltage Transformer?

Measuring heating of Transformer terminals and coils

Product Line:
LV Transformers

Applies to Low Voltage Transformers by SquareD/Schneider Electric

Need to monitor heat at the terminals of Low Voltage Transformers

TMT= Thermal Monitoring Top.   The Transformer has factory installed Exertherm heat sensors for Continuous Thermal Monitoring of terminal temperatures with Top Mounting of the electronic module on the enclosure.  (See the below attachment for illustration of electronic module on a Typical K21 style enclosure.) 
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