ELECTROMAGNETIC DRIVE FOR A POWER CIRCUIT-BREAKER WITH A VACUUM INTERRUPTER

摘要

A drive unit is provided for a moving contact of a vacuum tube. The drive unit has a tube pin which is conductively connected to the moving contact, a drive which is connected to the tube pin, and a conductor bridge. The drive moves the tube pin. The conductor bridge is directly conductively connected to the tube pin and a stationary conductor and bridges a travel of the tube pin between a conductive switching state of the vacuum tube and a non-conductive switching state. A magnet drive is provided, which contains a first magnet element, which is connected to the tube pin, and a second magnet element. The two magnet elements are configured to build up a magnetic force between them when current is flowing through the vacuum tube and in this way generates a contact-pressure force of the moving contact onto a fixed contact of the vacuum tube.