Circuit breaker and exhaust structure thereof

The invention discloses an exhaust structure of a circuit breaker. The exhaust structure comprises an exhaust port, which is aligned with the tail of an arc extinguishing chamber; the exhaust space of the exhaust port is superposed with a junction device of the circuit breaker; and the junction device occupies the exhaust space during non-junction and does not occupy the exhaust space during junction. The invention further discloses a circuit breaker with the exhaust structure. According to the exhaust structure of the circuit breaker, the empty space of the junction device is utilized to increase the quantity of the exhaust port and enlarge the exhaust space, so that the exhaust capability is remarkably improved; and the exhaust structure is further provided with segmentation protrusions for segmenting an arc, and the segmentation protrusions also play a role in supporting the arc extinguishing chamber, so that the arc extinguishing capability of the arc extinguishing chamber is prevented from declining due to shift caused by impact.