What is the difference between 0.2s accuracy class and 0.2 accuracy class in meters?

Answer 1

0.2S is more accurate at low currents than 0.2. While both have maximum errors of +/- 0.2% at 100% and 120% of rted current, 0.2S has +/- 0.75% at 1%, 0.35% at 5% and 0.2% at 20 % of rated current while 0.2 has 0.75% at 5% and 0.35% at 20% rated current. These values are found in IEC Standard 60044, Tables 11 and 12.

Answer 2

0.2S is more accurate at low currents than 0.2. While both have maximum errors of +/- 0.2% at 100% and 120% of rted current, 0.2S has +/- 0.75% at 1%, 0.35% at 5% and 0.2% at 20 % of rated current...

Answer 3

generally the 'S' means special and to underatnd that such meters are accurate at low rated inputs also. generally the accuracy is claimed between 5% to 120% of the rated value. Special class meters are accurate in lower band as well ie 1% of rated inputs hence are costly and are used where higher accuracy is required at min input also.