Galvanic Isolator Design for Fault Tolerant


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As known for Zener Barrier for ia can tolerate 2 faults by putting 3 zeners inside it so that if 2 fails the barrier can still work.
But how this is done in Galvanic isolator barrier as there is no zener here? What is the difference in design for a galvanic isolator to be suitable for protecting Zone-0 (ia) , Zone-1 (ib) or Zone-2 (ic)?