Self-dehydrating breather Comem eSDB Moisture is a leading cause of transformer aging. Avoiding moisture ingress into the transformer is of paramount importance to avoid outages and maximize the lifetime of the asset.  Comem eSDB has digital and analog output and data monitoring through Modbus and 4-20 mA. It increases transformer reliability, reduces operating costs, is maintenance-free and easy to install. Continuous moisture absorption is ensured by two independent silica gel tanks working alternatively on time-based or condition-based principles. Comem eSDB15 for power transformers from 40 MVA to 200 MVA