Abstract: An apparatus including a first housing and a pulse inverter, wherein the pulse inverter is arranged in the first housing, and includes first high-voltage components. The first housing includes a first coolant chamber and a second coolant chamber. The second coolant chamber is fluidically isolated from the first coolant chamber. The first coolant chamber includes a first coolant. The first coolant is a dielectric coolant. The first high-voltage components are arranged in the first coolant chamber. The first housing includes a first coolant port and a second coolant port. The first coolant port is in fluid communication with the second coolant port via the second coolant chamber in order to allow a fluid flow of a second coolant from the first coolant port via the second coolant chamber to the second coolant port.