Device for limiting movement of movable part in electrical equipment

A circuit breaker, comprising:

• a stationary contact;
• a movable contact;
• an actuating assembly comprising a stationary core and a movable part coupled to the stationary core, wherein the actuating assembly is configured to drive the movable contact toward or away from the stationary contact;
• and
• a limiting device comprising:
• a stopper provided in a moving path of the movable part and configured to contact the movable part at a predetermined position to prevent the movable part from moving;
• and
• wherein the stopper is mainly formed of an elastomer and comprises a stop surface, the elastomer being configured to be deformed when the movable part collides with the stop surface in a first direction;
• and
• wherein the elastomer further comprises a hole, wherein the hole comprises a through hole running through the elastomer in a thickness direction, and the through hole is configured to allow a fluid in the through hole to flow at least partially out of the through hole when the movable part collides with the stop surface in the first direction.