HEAT DISSIPATION DEVICE FOR AN ELECTRICAL CABINET

The invention relates to a heat dissipation arrangement for a switchgear cabinet, which has a switchgear cabinet housing (1) and, received in the interior (2) thereof, an assembly housing (4) mounted on a rear wall (3) of the switchgear cabinet housing (1) and serving to receive at least one component exhibiting a thermal power loss, wherein the assembly housing (4) has at least one fan, a cooling air inlet (5) and a warm air outlet (6), wherein via the fan cooling air is guided out of the switchgear cabinet housing (1) into the assembly housing (4), through the assembly housing (4) and out of the assembly housing (4) via the warm air outlet (6) as heated cooling air, characterized in that the warm air outlet (6) of the assembly housing (4) opens into a warm air inlet (7) of an air guiding duct (8) in the rear wall (3) of the switchgear cabinet housing (1), wherein the air guiding duct (8) is led through the rear wall (3) and is thermally coupled to an outer side (9) of the rear wall (3) and/or is delimited thereby, and wherein at least one cooling air outlet (10) of the air guiding duct (8) opens into the interior (2) of the switchgear cabinet housing (1). Furthermore, warm air is preferably emitted out of the air guiding duct (8) via a further warm air outlet (6.1) into the environment and ambient air is sucked into the air guiding duct (8) via a further cooling air inlet (5.1). Furthermore, a corresponding method for dissipating heat from a switchgear cabinet housing is described.