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All the drives from ATV61HD55M3X…HD90M3X, ATV 61HD90N4…HC63N4, ATV 61H***Y and ATV 61W***N4A24 are supplied as standard in a reinforced version.
KW ranges below those, S337 is added at the end of the reference for reinforced version
Hence The drive ranges ATV61HC...N4 operate as a reinforced version.
This variant enables variable speed drives to operate in difficult ambient pollution conditions and complies with standard IEC60721-3-3 class 3C2