The ornamental design for an electrical disconnect switch, as shown and described.
FIG. 1 is a front, top, left side perspective view of an electrical disconnect switch, showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In the drawings, the broken lines depict portions of the electrical disconnect switch that form no part of the claimed design. The dash-dot-dash lines define the boundaries of the claim.