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A circuit breaker (1) includes a load terminal (15) and a line terminal (13); a pair of main contacts (17); a separable pair of arcing contacts (63); and a moving conductor assembly (23) having a contact carrier (29) mounted for movement between an open position and a closed position to open and close the separable pairs of contacts (17, 63). The circuit breaker (1) further includes an arc chute (83) and an arc runner (75) electrically connected to a stationary arcing contact (61) and extending toward the arc chute (83) to provide a path for an arc struck between the separable pair of arcing contacts (63) as the separable pair of arcing contacts open with movement of the moving conductor assembly (23) from the closed position. The arc runner (75) has a longitudinal elongated raised ridge (97) generally laterally centred. (FIG. 4)