IEC 60077-4 gives rules for AC circuit-breakers, the main contacts of which are to be connected to AC overhead contact lines; the nominal voltage of these circuits is in accordance with IEC 60850. Complements the general requirements given in IEC 60077-2.
IEC 60077-4 Ed. 2.0 b:2019 History
IEC 60077-4 Ed. 2.0 b:2019
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IEC 60077-4 Ed. 1.0 b:2003
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