Spring mechanism for low-frequency vacuum circuit breaker

The invention discloses a spring mechanism for a low-frequency vacuum circuit breaker, which can be used for an European low-frequency contact network system and mainly comprises a lower spring seat, an upper spring seat, a reset spring, a pressing ring, a screwing clamping sleeve, a stud, a shunting braided wire, a spacer sleeve, an over-travel spring, a transmission disc, a plug and the like. The spring mechanism is installed inside an upper insulator and a lower insulator of the vacuum circuit breaker and between a vacuum tube moving contact and a transmission rod, and is matched with other components of the circuit breaker, so that reliable switching-on and switching-off of the vacuum circuit breaker are realized. The spring mechanism can be installed on a large-capacity and large-volume vacuum switch tube suitable for a low-frequency environment and is ingeniously assembled according to the structural characteristics of the vacuum switch tube, and the switching-on and switching-off functions of the vacuu