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What's Really Important When You're Designing The Low ...· When using ventilated transformers, the higher operating current of up to 1.5 x I N of the transformer must be taken into account. Go back to Index ↑ 2. Short-circuit strength. The short-circuit strength of the feeder circuit-breaker is determined by (n–1) x I k max of the transformer or transformers (n = number of transformers).

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