Rapid disconnect device

摘要

The invention relates to a rapid disconnect device for surge arrestors, in particular plate-type or flat varistors, comprising at least one element that is maintained under a mechanical stress, and a disconnection point for disconnecting the surge arrestor from the respective power grid upon thermal overload, wherein the disconnection point comprises contacts, the positions of which vary relative to one another, wherein one of said contacts is designed to be fixed. According to the invention, the contacts of varying positions relative to one another are electrically connected without the use of solder in such a way that incident current forces act primarily in the contact force direction and such that the moving contacts of the positionally-variable contacts of a lost element located at the surge arrestor and thermally detachable therefrom can be moved from a closed position to the disconnected position.

主权项

1. A fast disconnection device for a surge arrester comprising:
at least one first element held under a mechanical preload as well as a point of separation in order to disconnect the surge arrester from a source of power in the event of a thermal overload; a fixed electrical contact and a movable electrical contact, the fixed electrical contact and the movable electrical contact being situated at the point of separation, the positions of the electrical contacts being variable relative to each other, the electrical contacts being electrically connected without the use of a solder in such a way that occurring current forces act mainly in the direction of the contact force; a lost element, the lost element being selectively fixed to the surge arrester and being mechanically separable therefrom; and thermally-sensitive fixing means selectively fixing the lost element to the surge arrester; wherein the movable electrical contact is selectively held in place by the lost element in a closed position in which current may flow through the surge arrester, and is movable from the closed position to a disconnected position in which current cannot flow through the surge arrester when the lost element is mechanically separated from the surge arrester, the lost element not carrying the current passing through the surge arrester; and wherein heat generated by the surge arrester heats the thermally-sensitive fixing means which allows the lost element to separate mechanically from the surge arrester, the lost element, mechanically separated from the surge arrester, allowing the movable electrical contact to move from the closed position to the disconnected position.