Abstract: A surge arrester is disclosed. In an embodiment the surge arrester includes a first electrode for applying a first voltage potential to the surge arrester, a second electrode for applying a second voltage potential to the surge arrester, and a short-circuiting link for short-circuiting the first and second electrodes. The surge arrester further includes a retaining element for retaining the short-circuiting link, wherein the retaining element is embodied in such a way that it keeps the short-circuiting link at a distance from the first and second electrodes when a temperature is below a threshold value, and it shifts the short-circuiting link such that the short-circuiting link is pressed against the first and second electrodes and a short-circuit is produced between the first and second electrodes when the temperature exceeds the threshold value.

Abstract: The invention pertains to a rotary mixer and disperser head consisting of a shaft to which is connected a mixing chamber that is to be disposed into a vat or the like for dispersing, dissolving or blending of solids liquids or gasses with other liquids. The mixing chamber has secured to its upper and lower ends a plurality of impeller blades which have an end thereof located outside the mixing chamber to direct material into the mixing chamber and out through openings in the side wall of the mixing chamber during the mixing and dispersing thereof. The mixer and disperser head also comprises shear arms having a sharpened leading edge, thereby providing an additional initial shear zone. The specific mixing chamber and its configuration provide for a very efficient mixing operation.

Abstract: A surge arrester is disclosed. In an embodiment the surge arrester includes a first electrode for applying a first voltage potential to the surge arrester, a second electrode for applying a second voltage potential to the surge arrester, and a short-circuiting link for short-circuiting the first and second electrodes. The surge arrester further includes a retaining element for retaining the short-circuiting link, wherein the retaining element is embodied in such a way that it keeps the short-circuiting link at a distance from the first and second electrodes when a temperature is below a threshold value, and it shifts the short-circuiting link such that the short-circuiting link is pressed against the first and second electrodes and a short-circuit is produced between the first and second electrodes when the temperature exceeds the threshold value.

Abstract: The invention pertains to a rotary mixer and disperser head consisting of a shaft to which is connected a mixing chamber that is to be disposed into a vat or the like for dispersing, dissolving or blending of solids liquids or gasses with other liquids. The mixing chamber has secured to its upper and lower ends a plurality of impeller blades which have an end thereof located outside the mixing chamber to direct material into the mixing chamber and out through openings in the side wall of the mixing chamber during the mixing and dispersing thereof. The mixer and disperser head also comprises shear arms having a sharpened leading edge, thereby providing an additional initial shear zone. The specific mixing chamber and its configuration provide for a very efficient mixing operation.