Electrical device with indirect lightning protection, attitude and heading reference system, and aircraft

An electrical device with indirect lightning protection, comprising:

• an electrically conductive housing, within which electrical components are accommodated, wherein the electrical components are adapted to provide attitude and heading reference data for air navigation,
• an electrical data interface, which is connected to the electrical components in order to transmit internal electrical signals from the components out of the housing, or to transmit external electrical signals into the housing to the components,
• an electrical power supply interface, which supplies electrical power to the electrical components from an external power source,
• wherein the electrical data interface and the electrical power supply interface are configured in such a manner that the electrical components are galvanically isolated from the housing and from the input/output lines of the data interface and the power supply interface, so that damage to the components by a lightning-induced current pulse is prevented, and
• wherein the electrical data interface has an external data interface part that is connectable to a peripheral electrical conductor structure and an internal data interface part that is connected to the components, which are galvanically isolated, wherein data transmission between the external and the internal data interface parts is done optically, and wherein the electrical data interface includes potential equalization elements which are interconnected between two-core differential signal input/output lines in order to raise the input/output lines to the same electrical potential in the event of a lightning-induced voltage pulse to prevent a voltage flashover between the lines.