A lubricant pump assembly for use with a power distribution unit for a vehicle, comprising a pump, a first rotating component, a second rotating component, and a lubricant. The first conical bearing has a first bearing cone disposed on the shaft having bearing surfaces extending at an angle \u03b1 to the rotational axis, and a first bearing bush having a tapered bearing bore and bearing surfaces that are separated by a first bearing gap filled with bearing fluid from the bearing surfaces of the first bearing cone. The actuator has a motor, a screw, and an extension rod, which has limit positions connected with a limit switch set. The barrier has a top area and a base area spaced from the edges of the semiconductor body and an internal clearance of the barrier determines a size of the opening. The seal ring 40 is provided so as to surround the circuit forming regions D11 and D12.