Hydraulic connection (50, 72, 96) comprising: - at least one first and one second hydraulic line (52, 54, 73, 74, 92, 94) for power switch drives; and - a connecting bush comprising a hollow-cylindrical main body (12, 60, 77) having at least two annular grooves (14, 16, 62, 64, 78, 79) which encircle the external sleeve face of said main body (12, 60, 77) and have annular seals (18, 20, 66, 68, 80, 81) which are inserted in said annular grooves (14, 16, 62, 64, 78, 79); wherein - the hydraulic lines (52, 54, 73, 74, 92, 94) are made of a material having a second elasticity modulus; - the connecting bush is inserted in an overlapping manner into the hydraulic lines (52, 54, 73, 74, 92, 94) which at their end sides mutually abut; - a gap is formed between the main body (12, 60, 77) and the hydraulic lines (52, 54, 73, 74, 92, 94); and - the main body of the connecting bush is made of a material having a first elasticity modulus which is lower than the second elasticity modulus, such that when the hydraulic connection (50, 72, 96) is impinged with an internal pressure the hollow-cylindrical main body (12, 60, 77) is caused to widen more than the hydraulic lines (52, 54, 73, 74, 92, 94); wherein the hollow-cylindrical main body (12, 60, 77) is made as an injection-molded part from a plastics material or is a metal bush insert-molded in a plastics material, wherein - the hydraulic lines in each case enclose at least one of the annular seals, on account of which a sealing effect results independently of the system pressure; - the main body (60, 77) is disposed such that when impinged with a hydraulic pressure of from 50 bar it is widened to the extent that the gap in the region of the annular seals is closed, such that the annular seals are not extruded into the gap even at low pressure. - at least one first and one second hydraulic line (52, 54, 73, 74, 92, 94) for power switch drives; and - a connecting bush comprising a hollow-cylindrical main body (12, 60, 77) having at least two annular grooves (14, 16, 62, 64, 78, 79) which encircle the external sleeve face of said main body (12, 60, 77) and have annular seals (18, 20, 66, 68, 80, 81) which are inserted in said annular grooves (14, 16, 62, 64, 78, 79); wherein - the hydraulic lines (52, 54, 73, 74, 92, 94) are made of a material having a second elasticity modulus; - the connecting bush is inserted in an overlapping manner into the hydraulic lines (52, 54, 73, 74, 92, 94) which at their end sides mutually abut; - a gap is formed between the main body (12, 60, 77) and the hydraulic lines (52, 54, 73, 74, 92, 94); and - the main body of the connecting bush is made of a material having a first elasticity modulus which is lower than the second elasticity modulus, such that when the hydraulic connection (50, 72, 96) is impinged with an internal pressure the hollow-cylindrical main body (12, 60, 77) is caused to widen more than the hydraulic lines (52, 54, 73, 74, 92, 94); - the hydraulic lines in each case enclose at least one of the annular seals, on account of which a sealing effect results independently of the system pressure; - the main body (60, 77) is disposed such that when impinged with a hydraulic pressure of from 50 bar it is widened to the extent that the gap in the region of the annular seals is closed, such that the annular seals are not extruded into the gap even at low pressure.