SION vacuum circuit breakers control all switching duties in medium-voltage distribution systems and are suitable for installation in all established and new air-insulated medium-voltage switchgear as well as for retrofitting existing switchgear. They are used for operation, for example, of overhead lines, cables, transformers, capacitors and motors. The optional installation accessories enable easy integration into switchgear panels, and, maximally equipped as a withdrawable module with an earthing switch, form almost the comp