High-voltage circuit breaker

摘要

At least one primary switch position is connected in parallel with a series circuit composed of an auxiliary switch position provided with a cut-on or switching-in resistor. By means of a respective one of two lever drives each switch position is operatively coupled with a drive rod movable between a cut-on position and a cut-off position. The lever drive correlated to the primary switch position is provided with a double-arm lever which is pivotable about a stationary shaft. The double-arm lever is coupled at its one end to the drive rod and at its other end is coupled to a movable switching element of the primary switch position. The lever drive correlated to the auxiliary switch position is constructed such that during a cut-on stroke the auxiliary switch position initially is closed and at the end of the cut-on stroke such is reopened. In order to obtain these switching characteristics of the lever drive correlated to the auxiliary switch position with the smallest possible expenditure, in equipment design of the circuit breaker, without play-afflicted connections to the drive rod and without the need to use a spring-force storage, this lever drive possesses a pivot arm which is driven by the rotatably mounted shaft supporting the double-arm lever. Hinged to the end of this pivot arm is a cam disc which can be pivoted between two stable positions about a pivot or tilt shaft extending essentially parallel to the aforesaid rotatably mounted shaft. The cam disc is provided with a cam track into which engages a cam follower element secured to the movable switching element of the auxiliary switch position.