IEC 60947-4-2:2020 applies to a.c. semiconductor motor controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. This standard characterizes a.c. semiconductor motor controllers and starters with and without bypass means.
IEC 60947-4-2 Ed. 4.0 b:2020 History
IEC 60947-4-2 Ed. 4.1 en:2024
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IEC 60947-4-2 Ed. 4.0 b:2020
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IEC 60947-4-2 Ed. 3.0 b:2011
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IEC 60947-4-2 Ed. 2.2 b:2007
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IEC 60947-4-2 Ed. 2.1 b:2002
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