The ornamental design for a terminalblocklock out device, as shown and described.
FIG. 1 is a top, front, and right perspective view of a terminal block lock out device in an opened position suitable for insertion or withdrawal into a space of an open terminal block;
FIG. 2 is a top, rear, and left perspective view of the terminal block lock out device of FIG. 1;
FIG. 3 is a front elevational view of the terminal block lock out device of FIG. 1;
FIG. 4 is a rear elevational view of the terminal block lock out device of FIG. 1;
FIG. 5 is a right elevational view of the terminal block lock out device of FIG. 1;
FIG. 6 is a left elevational view of the terminal block lock out device of FIG. 1;
FIG. 7 is a top plan view of the terminal block lock out device of FIG. 1; and,
FIG. 8 is a bottom plan view of the terminal block lock out device of FIG. 1.
The broken line representations in the views are for illustrative purposes only and form no part of the claimed design.