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Joined 1 year ago
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Cake day: August 14th, 2023

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  • My Electromagnetics is a bit rusty, apply a healthy measure of skepticism:

    I’d say the two fuses are there to protect the transformer itself.

    In the example you use, the upstream of the transformer would be protected by the 280V fuses but the transformer itself will have to suffer the overcurrent, and could be damaged by it. If the transformer is dipped in cooling oil, the overcurrent could even lead to an explosion.

    As for the TUV inspection, the two fuses would be desirable for any TUV cert, and they would be required if there is any chance of explosion.