FUEL CELL SYSTEM

The invention relates to a fuel cell system () having at least one fuel cell stack (), an air path (), wherein air from the surroundings reach the fuel cell stack () via the air path (), an exhaust gas path (), a fuel line (), wherein fuel is transported to the fuel cell stack () via the fuel line (). According to the invention, the air path () is connected to a cooling line () via a branch (), wherein the cooling line () is connected to a PDU unit ().