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It is the uniform device and is not either a contactor, or the introduction automatic machine or their combination. The design of the switch represents the mechanism of cross over type (not on contactors!), which structurally exclude a possibility of counter inclusion of the main and reserve inputs. At a deviation of indicators of tension or frequency of an external power network (time of a delay, value of parameters can be determined), ASCO switches load of food from reserve input or DG. During switching, in the presence of two sources, loading remains deenergized only 35 milliseconds.
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The automatic ASCO switch of a series 300 in the case, 400A.
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