The ornamental design for a currenttransducer, as shown and described.
1.1: is a bottom, front, left side Perspective view of a current transducer showing my new design;
1.2: is a top, rear, right side Perspective view thereof;
1.3: is a Front elevation view thereof;
1.4: is a Back elevation view thereof;
1.5: is a Top plan view thereof;
1.6: is a Bottom plan view thereof;
1.7: is a Left side view thereof; and
1.8: is a Right side view thereof.
The evenly spaced broken lines illustrate portions of the current transducer and form no part of the claimed design. The unevenly spaced broken lines seen in fig. 1.1 and 1.6 illustrate a boundary line. The boundary line and the area within the boundary line forms no part of the claimed design.