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How to match this distribution box

The ammeter in the figure is three-phase 40A, and the front switch can be equipped with 40A. The incoming line looks like 10 square meter, matching 40A open circuit. Just buy a C40 spare. Three-phase 40A open circuit can withstand power of 22KW.

Besides, the sub-circuit was open in the year after next, and it must be less than 40A. Some 32A, 20A, 16A single-phase or three-phase open circuits can be matched according to the equipment power.