What are the differences between the externally mounted TVS*EMA part numbers in Digest 176 and the new SSP**EMA ones in Digest 177??
Product features comparison
Surge Protection Device
EMA , SSP
The new SSP devices have a smaller footprint, use screw covers instead of hinged, are Nema 1 standard now not 3R, and are Type 1 now vs. Type 1 or 2 . Both use the same MA*** modules and the modules are interchangeable.