High-voltage circuit breaker

In a high-voltage circuit breaker including a closing resistor which, during a closing operation of the breaker, is connected in parallel relationship with a main switching gap of the breaker by means of an auxiliary switching gap which closes before said main switching gap closes, and which is disconnected after said auxiliary switching gap closes by opening said auxiliary switching gap before said main switching gap opens, said auxiliary gap being open until said main switching gap is closed again;

• a movable, spring-loaded contact pin biased in the opening direction of said auxiliary switching gap;
• and a connecting rod coupled at one end to said auxiliary contact pin and at the other end to a rotatable crank drive of a drive unit of the circuit breaker, said crank drive being mounted on a rotating shaft;
• the improvement comprising said crank drive including a gate aperture for forcibly guiding said other end of said connecting rod, said gate aperture comprising a first curved portion which is concentric with said rotating shaft on which said crank drive is mounted, and a linear portion disposed at one end of said curved portion located along the direction of rotation of said crank drive during said closing operation of said breaker, said linear portion being further disposed approximately radially outwardly with respect to said rotating shaft of said crank drive.