An electrical apparatus disclosed herein includes first/second electrical units configured to be fixed to each other. The first electrical unit has a first surface including a connector. The second electrical unit has a second surface facing the first surface of the first electrical unit. The second surface includes a socket configured to fit with the connector. One of the first and second electrical units includes a stud bolt extending toward the other of the first electrical unit and the second electrical unit, and the other of the first and second electrical units includes a bolt hole through which the stud bolt is configured to pass. When the second electrical unit is separated from the first electrical unit with the second surface facing the first surface, a bolt-hole distance from the stud bolt to the bolt hole is shorter than a connector-socket distance from the connector to the socket.