The ornamental design for an electricrotatableswitch, as shown and described.
FIG. 1 is a perspective view of an electric rotatable switch where surfaces have been identified as being two different colors, but such indications are not intended to denote any specific colors in this figure or any of the following figures;
FIG. 2 is a left elevational view thereof;
FIG. 3 is a right elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken line portion of the figure drawings is included to show unclaimed subject matter only and forms no part of the claimed design.