a first power module including a first lock feature extending from a first minor side;

a second power module including a second lock feature on a second minor side,

wherein the first lock feature is interlocked with the second lock feature to secure the first power module to the second power module; and

a coolant circulation system wherein the first power module and the second power module define coolant channels extending through the first power module and the second power module and open into a coolant cavity defined between the first power module and the second power module by a first surface of the first power module and a second surface of the second power module, wherein the coolant cavity is defined by a groove that extends about one of the first surface or the second surface on one of the first and second power modules and an extension that extends about the other of the first surface or the second surface provided on the other of the first power module and the second power module, wherein the coolant cavity defining extension is received in the coolant cavity defining groove, and wherein the coolant cavity provides fluid communication of coolant between the coolant channels across heat generating components disposed within the first power module and second power module.