The present invention is a power distribution mounting component operable at high voltages. More specifically, the power distribution mounting component includes: an insulating layer; current-carrying first conductor layers sandwiching the insulating layer; and a second conductor layer (thinner than the first conductor layers) interposed between the insulating layer and at least one of the first conductor layers. Each the second conductor layer between the insulating layer and the overlying current-carrying first conductor layer is sufficiently thinner than the first conductor layer and is therefore formed in close adhesion to the insulating layer, thereby increasing the partial discharge inception voltage of the power distribution mounting component and therefore its insulation reliability.