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 complete circuit breaker compartment inside the switchgear. R-HG11-385.tif R-HG11-381.tif Description General information The circuit breaker mounted on a withdrawable part can be supplied both with and without contact arms and contacts. SION vacuum circuit breaker for fixed mountin