Abstract: A device (10) for supplying electrical power and signals to a submersible pump (15) in such a way that it is sealed from liquids via an external electrical cable (11) extending through a opening (49) within the head (48) of a pump housing (50). The device comprises a plug connector device (10), whose pump-side plug connector part (13) is arranged within the through opening (49) of the housing head (48) so as to be axially movable and whose cable-side plug connector part (12) is provided with an insulation coating (25), which extends from an area of the cable jacket (20) down to its plug connector contacts (17), and about which, behind its free end, a coupling part (27) is provided which can be connected in a mechanically fixed manner to a counterpart coupling part (54) on the exterior end of the through opening (49) within the head (48) of the pump housing (50).