The new standard IEC 61439 replaces the old 60439. After a first reading my initial impressions are that it is a more clearly defined standard. Some key differences are that the distinction between type tested assemblies (TTA) and partially type tested (PTTA) is gone, verifying the performance is addressed in new ways and the specification of current ratings is updated. What I found particularly interesting is the clarifications on the specification of current ratings.
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