Protective case for an electronic device

FIG. 1 is a perspective view of a protective case for an electronic device showing my new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top elevational view thereof; and,

FIG. 7 is a bottom elevational view thereof.

The broken lines showing a zipper are for the purposes of illustrating environment and form no part of the claimed design.