Fail-Safe

Fail-Safe Plus® models not only meet the fail-safe test criteria in the revised ABYC A-28 (July 2008 publication), the US standard for galvanic isolators, but also have considerably higher AC fault current ratings than are required and have substantial lightning current ratings which are not required by A-28; hence, the "Plus" version unique to DEI.



Fail-Safe Max® models provide even higher performance than Fail-Safe Plus models, in that they have higher fault current ratings and they still meet all requirements of A-28 after being subject to the fail-safe test criteria (i.e. the melting level of the conductor).

Please feel free to contact DEI with any further questions regarding the fail-safe design of all of our products.