When using current transformers, the accuracy of measurement determined by the primary current amplitude error (contrast) and phase error (difference). In medium accuracy without the requirement of DC component of electric meter, the absolute value of these two is very low, but it can be compensated through the relevant correction circuit. DC component of current transformer is different, because the difference of its  phase difference is large and stable. The special characteristic of amplitude error is relatively small. There is an energy measurement error. The error changes with the primary current. If the phase difference don't compensate, it cannot be applied in high perceptual load.

Part Number    DC current      core dismension(mm)precision

                            A             OD   ID     HT          grade

EF02R01908         40             19     14     8            0.1

EF02R02010         40             20     14     10           0.1

EF02R02108         60             21     14     8             0.1

EF02R02110D      60             21     16     10D           0.1

EF02R02110         60             21     16     10            0.1

EF02R02210         60             22     16.5 10              0.1

EF02R02310         60             23     16     10             0.1

EF02R02408         60             24     17     8               0.1

EF02R02410         80             24     18     10             0.1

EF02R02808         80             28     17     8               0.1

EF02R02315        100             23.5 16.5  15              0.1

EF02R02508        100             25     16     8              0.1

EF02R02610        100             26     19     10            0.1

EF02R02708        100             27     19     8              0.1

EF02R02810        100             28     19     10            0.1

EF02R03008        100             30     20     8              0.1

EF02R02510        120             25     16     10            0.1

EF02R02712        120             27     19     12            0.1

EF02R02812        120             28     19     12            0.1

EF02R03006        120             30     21     6.5           0.1

EF02R02715        150             27     18     15            0.1

EF02R03310        160             33     23     10            0.1

EF02R03315        200             33     23     15            0.1
We can make customized dimension and specification.