Patent ID: 7982331

Claim:
A system, comprising: an interface to an external power source; a variable speed generator power source; and a power transfer switch unit operatively coupled to the interface, the generator power source, and an output power bus, the power transfer switch unit being structured to switch between the external power source and the generator power source to transfer electric power to the output power bus, the power transfer switch unit including: a contactor defining a number of landings between a first end portion and a second end portion, the landings each being separated from one another by a corresponding one of a number of dividing walls; a printed circuit board carrying a number of power electronic devices, the printed circuit board including a first side opposite a second side and defining an opening therethrough, the opening being bordered by several tabs each separated from one another by a corresponding one of several notches, the tabs each including an edge clad with a metallic layer, the contactor being received through the opening to place each respective one of the dividing walls through a respective one of the notches, each respective one of the tabs being fastened to a respective one of the landings; and an enclosure including a first enclosure wall opposite a second enclosure wall, the contactor and the printed circuit board being contained in the enclosure and at least one of the first end portion and the second end portion engaging the enclosure to position the printed circuit board between the first enclosure wall and the second enclosure wall.