Moving end assembly, arc extinguish chamber and circuit breaker

The invention relates to the technical field of high-voltage switches, in particular to a moving end assembly, an arc extinguish chamber and a circuit breaker, the circuit breaker comprises the arc extinguish chamber, the arc extinguish chamber comprises the moving end assembly, the moving end assembly comprises a moving main contact and a nozzle, the moving main contact is provided with a nozzle mounting hole, the nozzle is provided with a fixed mounting part, the nozzle mounting hole is provided with a mounting hole opening for the fixed mounting part to be mounted, and the nozzle mounting hole is provided with a fixed mounting hole. The inner wall of the nozzle mounting hole is provided with a nozzle abutting part for abutting the fixed mounting part, the mounting hole is provided with a riveting convex edge, the riveting convex edge is provided with an inward turning part which is turned towards the center line of the nozzle mounting hole, and the inward turning part is used for applying pressing force to