The ornamental design for an electrical powerunit, as shown and described.
FIG. 1 is a front perspective view of an electrical power unit showing our new design in an open-cover configuration, viewed from above and to the right;
FIG. 2 is a rear perspective view thereof, viewed from above and to the left;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevation thereof;
FIG. 5 is a rear elevation thereof;
FIG. 6 is a left side elevation thereof; and,
FIG. 7 is a right side elevation thereof.
In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design. A bottom view forms no part of the claimed design.