A effective lower flow direction comprises power module and a housing that is arranged on an upper surface of the power module defining an upper flow section for liquid cooling of the power module in between. The upper flow section comprises an inlet, an outlet and a given upper flow path in between defining an effective upper flow direction. Further, a cooling unit is arranged on the lower surface of the power module defining a lower flow section for liquid cooling of the power module in between. The lower flow section comprises an inlet, an outlet and a given lower flow path in between defining an effective lower flow direction, such that during operation a coolant flows through the upper and the lower flow section providing a double-sided liquid cooling of the power module. The effective upper flow direction is different from the effective lower flow direction.