| 摘要 |
A disconnect switch has a fixed tubular contact, an associated fixed auxiliary contact connected thereto, and a movable tubular contact which is guided in a stationary outer housing. The movable tubular contact contains a movable auxiliary contact. Both movable contacts are separately movable into connection with the fixed contacts. To enable the switch to be used for higher voltages while achieving short pre-breakdown times and using a drive which operates at normal speed, the movable auxiliary contact is at first latched against movement, compressing a spring. The movable auxiliary contact is then released to actuate the switch. To this end, each end of the movable auxiliary contact is provided with a catch which can be engaged by a cooperating pawl located at either end of the travel of the auxiliary contact. A control member is longitudinally movable on the movable auxiliary contact. A spring is mounted between the control member and each of the catches. The control member is coupled to the movable tubular contact via a reduction drive.
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