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TVS44IMA12Z: is this a valid part number? What is the Z designation?

Issue:
TVS44IMA12Z: is this a valid part number? What is the Z designation?

Product Line:
Surge Protection

Environment:
IMA

Cause:
Identification

Resolution:
This is a part number for a TVSS installed in PZ4 switchgear. It is not available for sale. However, components are available such as the display or (typically) a module. 

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