To what standards do the A class and B class filters correspond in the variable speed drives?

EMC environment and EMC input filter
Industrial and commercial EMC environments are described by standards, and Schneider Electric has designed EMC filters to comply with the radio interference levels specified in these standards.
 

Class A and class B filters
Class A filters are mainly used in industrial environments as they are suitable for the EMC environments described by the typical standards for this type of environment:
 

EN55011 class A group 1          or          IEC/EN 61800-3 category C2
EN55011 class A group 2          or          IEC/EN 61800-3 category C3

Class B filters are used in commercial (building) or domestic environments as they are suitable for the EMC environments described by the typical standards for these types of environment:
 

EN55011 class B group 2          or          IEC/EN 61800-3 category C1
Class B filters provide higher performance than class A filters because commercial environments (offices, administration) need to have a higher level of protection than industrial environments.
 

Schneider Electric offer

The Schneider offer comprises drives with or without filter. If they have a filter, it may be class A or class B.
As an EMC filter incurs expenditure, it is must be optimised by answering the following questions:
 

Industrial or commercial environment (most important criterion)
Distance between drive and motor
Switching frequency

An optional additional filter can be added if the standard filter is not compatible with a more severe EMC environment than that for which it is designed.
However, the complete products are suitable for the majority of cases.
 

ATV21
ATV21H075M3X to ATV21HD30M3X: without EMC filter
ATV21H075N4 to ATV21HD75N4: with integrated class A filter
ATV21W075N4 to ATV21WD75N4: with integrated class A filter
ATV21W075N4C to ATV21WD75N4C: with integrated class B filter 

ATV312
ATV312H018M2 to ATV31HU22M2: with integrated class A group 1 filter
ATV312H037N4 to ATV312HU040N4: with integrated class A group 1 filter
ATV31HU22M2: with integrated class A group 2 filter
ATV312HU55N4 to ATV312HD15N4: with integrated class A group 2 filter
ATV312H018M3 to ATV312HD15M3: without EMC filter

ATV12
ATV12xxxxF1, ATV12H018M3, ATV12x037M3 to ATV12xU22M3: without EMC filter
ATV12xxxxM2: with class A or class B filter depending on the cable length or switching frequency. Remember they are high-performance.
 
ATV61
ATV61H075M3 to ATV61HU22M3: with integrated class A group 1 filter
ATV61HU30M3 to ATV61HU75M3: with integrated class A group 2 filter
ATV61HD11M3X to ATV61HD90M3X: without integrated EMC filter
ATV61H075N4 to ATV61HU40N4: with integrated class A group 1 filter
ATV61HU55N4 to ATV61HC63N4: with integrated class A group 2 filter
ATV61W075N4 to ATV61WD90N4: with integrated class A group 1 filter
ATV61W075N4C to ATV61WD90N4C: with integrated class B filter

ATV71
ATV71H037M3 to ATV71HU22M3: with integrated class A group 1 filter
ATV71HU30M3 to ATV71HU75M3: with integrated class A group 2 filter
ATV71HD11M3X to ATV71HD75M3X: without integrated EMC filter
ATV71H075N4 to ATV71HU40N4: with integrated class A group 1 filter
ATV71HU55N4 to ATV71HC50N4: with integrated class A group 2 filter
ATV71W075N4 to ATV71WU40N4: with integrated class A group 1 filter
ATV71WU55N4 to ATV71WD75N4: with integrated class A group 2 filter
ATV71PU15N4Z to ATV71PU40N4Z: with integrated class A group 1 filter
ATV71PU55N4Z to ATV71PU75N4Z: with integrated class A group 2 filter