The power module housing comprises two electrically insulating housing elements (1, 2) that are attached to each other. A first of said housing elements (2) comprises at least two openings (24) for electric power terminals (31, 32) and a slot-like recess (23). Between the openings (24) three insulating walls (11, 21, 22) are arranged on and perpendicular to a surface of the housing. One insulating wall (11) is part of a second of said housing elements (1) and is inserted into the recess (23) in said first housing element (2), while an at least one second of said insulating walls (21, 22) is part of the first housing element (2). The insulating walls between the openings for the power terminals allow a compact arrangement of the terminals.