The invention discloses an arc control device of a
circuit breaker, wherein the arc control device is positioned in a shell of the
circuit breaker. The arc control device of the
circuit breaker comprises an arc control chamber 2 with an arc
control grid sheet and an exhaust chamber 3, wherein the exhaust chamber 3 comprises a
shunting cavity 13 and a winding roadway 12; the shell is provided withan exhaust port 11; the winding roadway 12 is communicated with
atmosphere outside the circuit breaker; the
shunting cavity 13 is communicated with the arc control chamber 2 by an air guidance slot 31; the exhaust chamber 3 separates the winding roadway 12 from the
shunting cavity 13 by a shunting piece 32 and two shunting cavity side walls 34; the part, which is positioned in the shunting cavity13, of the shunting piece 32 is distributed in a Y shape and comprises a V-shaped support
arm surface and a linear landing leg, the two support arm ends of the V-shaped support
arm surface are fixedly connected to the end part of the shunting cavity side walls 34, and the linear landing leg is parallel to the shunting cavity side walls 34 and extends towards the air guidance slot 31 to divide
airflow into two parts; and the shunting cavity 13 and the winding roadway 12 are communicated by a shunting cavity air guide port 33. The arc control device can ensure that
airflow air pressure requiredfor improving arc blowing speed in the arc control chamber can be maintained, and the cooling path of arcing gas is increased.