Encapsulated circuit breaker

The design is the visual features of the CIRCUIT BREAKER shown in solid lines in the drawings, whether those features are features of one of shape, configuration, pattern or ornament, or are a combination of any of these features. Drawings of the design are included. FIG. 1a is a top view of the Circuit Breaker; FIG. 2 is a front view of the Circuit Breaker; FIG. 3 is a rear side view of the Circuit Breaker; FIG. 4 is a left side view of the Circuit Breaker; FIG. 5 is a right side view of the Circuit Breaker; and FIG. 6 is a bottom view of the Circuit Breaker.