The ornamental design for a three phasebus mounted surge protection device, as shown and described.
FIG. 1 is a front perspective view of the three phase bus mounted surge protection device showing our design;
FIG. 2 is an exploded view thereof;
FIG. 3 is first side view of the surge protection device;
FIG. 4 is an opposing side view of FIG. 3;
FIG. 5 is a second side view thereof;
FIG. 6 is an opposing side view of FIG. 5;
FIG. 7 is a top view of the surge protection device;
FIG. 8 is a bottom view of the surge protection device; and,
FIG. 9 is an environmental view of the three phase bus mounted surge protection device positioned in a circuit breaker panel with similarly sized circuit breaker modules.
The broken lines in the drawings illustrate portions of the article that form no part of the claimed design.