 Parallel to each thyristor module a capacitor and parallel to each valve function a varistor is switched.As thyristors the model U78 S346 S34 manufactured by Siemens, which has a maximum power rating of 4100 amperes and which was when GKK Etzenricht was built the most powerful thyristor in the world.At both ends of the hall there are three bays for the accommodation of the static inverter transformers, which are built as single-phase units.