The technology innovation is a new electrical potential separator for cryotechnics. It is applicable particularly to electrically isolating areas, in which different potentials occur. The device consists of a dielectric tube e.g. made of polyimide, which still isolates when subjected to low temperatures as a result of its material properties. An annular groove is located on the exterior of both end areas of the tube, in which a support ring is inlaid. Electrodes are applied to the tube such that they cannot be removed. The electrodes themselves are detachably connected to flanges that are pulled onto the face of the tube to seal the device. The technology is ready for use in the non‐fusion domain and was patented by the inventors Stefan Fink and Günter Friesinger