Arc extinguish chamber and circuit breaker

The utility model relates to the technical field of electrical equipment, in particular to an arc extinguish chamber and a circuit breaker. The arc extinguishing chamber provided by the utility model is internally provided with an insulation structure and a plurality of arc extinguishing grid sheets, and an arc striking sheet is arranged between part of two adjacent arc extinguishing grid sheets. The insulating structure is arranged opposite to the contact system. The insulation structure is provided with a protrusion, a first comb tooth groove and an exhaust channel. The two sides of each arc extinguishing grid sheet are inserted into the corresponding first comb tooth grooves, the middle portion of each arc extinguishing grid sheet corresponds to the exhaust channel, and the arc striking sheets are matched with the protrusions. Meanwhile, the insulating structure can generate gas beneficial to arc extinguishing. When an electric arc entering between the arc extinguishing grid plates reaches the position of