A power switching circuit is provided for use in an integrated circuit including at least a first voltage rail and a second voltage rail. The power switching circuit includes at least one MOS device having a first source/drain adapted for connection to the first voltage rail, a second source/drain adapted for connection to the second voltage rail, and a gate adapted for receiving a control signal. The MOS device selectively connects the first voltage rail to the second voltage rail in response to the control signal. The first and second voltage rails form a grid overlying the power switching circuit, the first and second voltage rails being formed in different planes relative to one another. The connection between the power switching circuit and the first voltage rail is made at an interface between the first and voltage rails.