Circuit breaker and power equipment

The invention provides a circuit breaker which can be suitable for arc extinguishing of high-voltage arcs, a through-flow row used for transmitting currents is arranged between an upper shell and a lower shell of the circuit breaker, the through-flow row can be cut off through movement of a piston contained in the upper shell, the piston comprises a first insulation part, the first insulation part extends in the moving direction of the piston, and the first insulation part is provided with a second insulation part. And the lower shell comprises a second arc-extinguishing insulating part and an arc-extinguishing gate. The second insulating part extends along the moving direction of the piston, and after the piston moves, an insulating seam is formed between the first insulating part and the second insulating part. The arc chute is provided with a first arc striking structure and a second arc striking structure, the first arc striking structure extends towards the through-flow bar, and the second arc striking s