Fail Safe Plus
Fail-Safe Plus® models not only meet the fail-safe test criteria in ABYC A-28, 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