Overvoltage protection device having at least one surge arrester

摘要

The invention relates to an overvoltage protection device, comprising at least one surge arrester and one switchgear assembly, which is connected in series to the surge arrester and which can be triggered thermally, wherein the aforementioned components form a structural unit, and the thermal tripping means is arranged in the area of the expected heating up of the surge arrester when overloaded. According to the invention, the thermal tripping unit is configured as a stop element through which operating current or surge current does not flow. In the event of thermal overload, the stop element opens a releasing device of the switchgear assembly, wherein said switchgear assembly has an increased self-extinguishing capacity.

主权项

1. Overvoltage protection device, which comprises:
at least one surge arrester, a thermally triggerable switching device which is connected in series with the surge arrester, the thermally triggerable switching device having an unlocking slide which is movable in a path of motion, and a thermal trigger means operatively coupled to the unlocking slide, wherein the surge arrester and the thermally triggerable switching device form a unit and the thermal trigger means is arranged in an area of the expected heating of the surge arrester when the surge arrester is overloaded and is thermally and mechanically coupled to the surge arrester and releases the unlocking slide in the event of a thermal overload, wherein the thermal trigger means functions as a stop part through which neither operating current nor surge current flows and blocks the path of motion of the unlocking slide which bears against the thermal trigger means, wherein the switching device includes two opposite engaging contact pieces, wherein at least one of the contact pieces is movable in a direction of motion and is spring-preloaded to move in the direction of motion when the switching device changes from a closed condition to an open condition, and wherein the closed condition of the switching device is secured by the unlocking slide and can be released by the thermal trigger means to open the switching device in the event of a thermal overload.