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Can a 480Y/277v rated TVS4EMA16A be used on a 120/208v system?

Issue:
Can a 480Y/277v rated TVS4EMA16A be used on a 120/208v system?

Product Line:
TVSS/ SPD

Environment:
Application

Cause:
Verification

Resolution:
No, the TVS4EMA's clamping voltage would be too high to be useful. Using a TVSS that is made for 480Y/277V on a 208Y/120V system would not allow the TVSS to provide proper protection.
A 208/120V TVSS would clamp at 400V where a 480/277V TVSS would clamp at 800V. Also the TVSS for 480/277V when placed into a 208/120V system would have problems with the diagnostics due to lack of voltage to the diagnostic circuit.


 
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