In addition to the general requirements of IEC 60077-2, IEC 60077-3 gives the rules for circuit-breakers, the main contacts of which are to be connected to d.c. power and/or auxiliary circuits. The nominal voltage of these circuits does not exceed 3 000 V d.c. according to IEC 60850.
IEC 60077-3 Ed. 2.0 b:2019 History
IEC 60077-3 Ed. 2.0 b:2019
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IEC 60077-3 Ed. 1.0 b:2001
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