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What are the differences between the older style TVS*EMA devices and the newer SSP**EMA devices?

Issue:
Product features comparison

Product Line:
Surge Protection Device 

Environment:
EMA , SSP

Resolution:
The newer SSP EMA SPDs are avalible in NEMA 1 and 4X with Type 1 MA modules standard. The older TVS EMA SPDs were available in NEMA 3R and 4X with Type 2 MA modules standard. 
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