Overvoltage protection arrangement having a plurality of planar varistors arranged on a first side of an n-cornered supporting plate

Abstract

The invention relates to an overvoltage protection arrangement having: a plurality of planar varistors, which are arranged on a first side of a supporting plate; at least one gas arrester; and at least one thermal disconnection device, which is in close thermal contact with at least one of the varistors. The aforementioned components are surrounded by an outer housing, and electrical connection meansfor soldering to a printed circuit board are also provided on the second side of the supporting plate. The varistorshave a parallel stack arrangement, which is delimited on each of two opposing sides by an insulating partition wallwhich can be attached to the supporting plate. Each partition wall has at least one opening for a varistor terminal (), each varistor terminal being connected to a thermal disconnection device, which in turn comprises a spring-loaded disconnecting lever (), the respective disconnecting lever being connected at its first end to the respective varistor terminal by a soldered connection () and wherein its second end merges into one of the electrical terminalsand penetrates through the supporting plate. The thermal disconnection device also has an insulating slide, whose free end acts on the disconnecting lever (), wherein the slide runs in recesses in the respective partition wall, and a change in the position of the slide can be seen by means of a viewing openingin the outer housing