The invention belongs to the field of circuit breakers, and discloses an arc extinguishing device and a
circuit breaker, the arc extinguishing device comprises two
air compression chambers which are connected in parallel, the two
air compression chambers share the same
piston rod, the two
air compression chambers are both communicated with a fracture, the
piston rod can synchronously compress the two air compression chambers to form required
pressure difference or outlet flow velocity difference, and then
eddy current is formed. According to the utility model, hot air entering the
expansion chamber is cooled, and then high-pressure cold-state insulating gas is blown to the fracture, or the high-pressure cold-state insulating gas forming
eddy current is directly blown to the fracture, so that the
breaking capacity is improved; by adopting the device, the on-off performance of the arc extinguish chamber is improved, and compared with a traditional method, the on-off performance can be improved without adopting a mode of increasing operation work, and the operation reliability and efficiency of the
circuit breaker are improved; the arc extinguishing device is simple in structure and principle, convenient to implement, operate and maintain, good in breaking performance and good in popularization and application value.