Overvoltage protection means comprising at least one surge arrester and a, with the surge arrester, is connected in series, thermally the triggerable switching device

摘要

The present invention relates to an overvoltage protection means, comprising at least one surge arrester and a, with the surge arrester, is connected in series, thermally the triggerable switching device, wherein said means to form a structural unit and the thermal triggering means in the region of the expected heating of the surge arrester is arranged in the case of the overload. The thermal release means is in the form of a not by the operation - or surge current running through it stop part, which in the case of thermal overload an unlocking of the switching device is brought about or releases. Furthermore, the stop part thermally and mechanically coupled with a surface side of the surge arrester and blocks the path of movement of a mechanically prestressed release slide. According to the invention, in the release slide a contact lamella is used, which is a electrical connection between elements of the switching device and with release action of the contact lamella which is subject to a displacement movement with the consequence of an interruption of the series circuit, as well as movement of the unlocking slide into the space occupied by the contact lamella formerly, wherein at least the portion of the elements of the switching device separating region of the unlocking slide is designed insulated.