Breaker out

The door is open, the cirquitbreaker is driven out so the work at the generator can safely start.
This breaker is part of an installation (Static Frequency Converter, or SFC) that converts the 23000V to 3300V for driving the shaftline by means of the generator (using it as an electric motor). This state is then called "shaftline on turning gear" thus ensuring is to cool down equally.
In a few hours the technicians have to do a job on the generator so it has to be set in a safe state.

From a different angle.