Patent ID: 8050008

Claim:
A relay device comprising: a plurality of mechanical relays each of which includes: a coil; a moving contact, a position of which changes in accordance with whether or not the coil is energized; a load terminal conductive to the moving contact; and a coil terminal connected to the coil; a first bus bar including a loading circuit, wherein: an electric current flows to an external load through the loading circuit; and the loading circuit is opened and closed as a result of the change of the position of the moving contact; a second bus bar including a coil circuit through which the coil is energized; and a relay drive circuit packaged on the second bus bar and configured to open and close the coil circuit based on an operation signal, wherein: the first bus bar and the second bus bar are stacked at predetermined intervals; the plurality of mechanical relays is located between the first bus bar and the second bus bar; the load terminal is connected to the first bus bar; and the coil terminal is connected to the second bus bar.