Abstract: An apparatus (1) provided to connect at least one device (2) to a power distribution system (3), said apparatus (1) comprising a human machine interface, HMI, (4) having elements to interact with the apparatus (1), wherein the human machine interface elements (11,12) are adapted to display and/or to adjust setting values of operation parameters of the at least one connected device (2), wherein access to one or more human machine interface elements is restricted by at least one access restriction mechanism of said apparatus (1) to enhance the operation security of the at least one device (2) connected via said apparatus (1) to said power distribution system (3) and/or to enhance the operation security of the apparatus (1) and/or of the power distribution system (3).

Abstract: An internal gear pump (1) is proposed for conveying a fluid by a driven pump gear wheel (3) and a ring gear (4), as a gear pair residing in an enclosure, which are, for instance, meshing and hereby generating a sealed area. Hereby, viewed cross-sectionally, a sickle shaped part (5) is provided for sealing the free space, located nearly opposite to the sealed area, whereby a first end piece (12) and a second end piece (13) of the part (5) are assigned to a high pressure area. In accordance with the invention, the two end pieces (12, 13) of the part (5) are constructed differently.

Abstract: An internal gear pump (1) for conveying a fluid by a driven pump gear wheel (3) and a ring gear (4), as a gear pair located within an enclosure, which at least partially mesh with one another. A sickle shaped part (5) is provided for sealing the free space located substantially opposite to the sealed area. A first end piece (12) and a second end piece (13) of the sickle shaped part (5) are assigned to pressure areas of the internal gear pump (1). In accordance with the invention, the two end pieces (12, 13) of the part (5) are constructed differently so as to avoid, or reduce as much as possible, both cavitations and noise.