Patent ID: 6866577

Claim:
A combination of a housing for an electrical circuit and a cooling unit detachably mountable to the housing, the housing comprising: an enclosure defining an interior space for receiving electrical circuit components; a receiving surface for receiving the cooling unit; an opening in the receiving surface; at least one detent having an engagement surface facing toward the interior of the enclosure and positioned adjacent a first edge of the opening; and a fixing element positioned adjacent an edge of the opening opposite said first edge; and the cooling unit comprising: a mounting surface engageable with the receiving surface; an air duct and a ventilator operable to cause an air flow through the duct; at least one abutment surface positioned at one side of the mounting surface and facing oppositely to the mounting surface; and a fastener positioned at a side of the mounting surface opposite to said one side; the arrangement being such that the abutment surfaces of the cooling unit are engageable by the detents of the housing, and the air duct of the cooling unit is aligned with the opening in the housing when the mounting surface of the cooling unit abuts the receiving surface of the housing and the fastener of the cooling unit is aligned with and engageable with the fixing element of the housing.