Patent ID: 9093203
Filing Date: 2015-07-28
Classification: H01C,H01H,H01T

Abstract:
1. An overvoltage protection element, comprising: a housing, at least one overvoltage limiting component located in the housing, two connection elements for electrical connection of the overvoltage protection element to a current or signal path to be protected, each of the connection elements being in electrical contact with a pole of the respective overvoltage limiting component in a normal state of the overvoltage protection element, and a thermally expandable material within the housing, wherein the thermally expandable material is expandable in response to thermal overloading of the overvoltage limiting component, expansion of the thermally expandable material moving the at least one overvoltage limiting component so as to break said electrical contact between at least one pole of the overvoltage limiting component and the respective connection element, wherein the housing comprises an outer housing and an inner housing, the inner housing being open on one side and being located in the outer housing, wherein the connection elements are fixedly connected to the outer housing, wherein the overvoltage limiting component is located within the inner housing, wherein the inner housing surrounds the thermally expandable material in the normal state of the overvoltage protection element, and wherein the inner housing moves relative to the outer housing when the thermally expandable material expands as a result of heating of the overvoltage limiting component.