The present invention relates to a sealing assembly (100,200), which can be used for sealing an electric circuit of a connector (510). The sealing assembly includes a soft, elastic core (130), which is compact when deformed and which includes one or more inserting channels (132) for inserting contacts. The sealing assembly includes an outer inserting layer (110) and an outer exiting layer provided with protective elements (120) in correspondence with the inserting channels (132) and adapted to be positioned between the cutting edges of a contact and the sealing core (130) during insertion of the contact in the sealing assembly.