A connector for electrical supply of a unit of the hydraulics which can be arranged or is arranged at a casing of such unit. Thereby at least one current path penetrates a connector bottom of the connector and the connector bottom is sealed with a silicone-containing compound against penetrating moisture in an area of this passage. The compound is an adhesive having high adhesive forces. A casing of a unit of the hydraulics can include such connector. A method of sealing a connector bottom of a connector penetrated by a current path is disclosed via which connector a unit of the hydraulics is adapted to be electrically supplied, the method includes a step of sealing a passage of the current path through the connector bottom with silicone-containing adhesive.