Patent ID: 7894206

Claim:
A modular protection housing for a field device, comprising: a first housing module having a first volume and a first potential rail; and a second housing module having a second volume and a second potential rail; wherein the first housing module and the second housing module are coupled so as, in a coupled operating state, to form a uniform housing with a shared volume, the shared volume being composed from the first volume and the second volume; wherein the first potential rail and the second potential rail are coupled in such a way that the first potential rail and the second potential rail, in the coupled operating state, form a common potential rail extending through the shared volume, wherein the first potential rail and the second potential rail are coupled so that the common potential rail comprises a cylindrical housing extension, wherein the first housing module and the second housing module are rotatably coupled to each other, wherein in the coupled operating state, the cylindrical housing extension serves as a rotary bearing for the protection housing, and wherein the common potential rail is made of electrically conductive material.