Patent ID: 8633795

Claim:
A thermal fuse in a circuit structure with several circuit areas with connections sites and a fusible element that is electrically and mechanically connected to the connection sites of a soldering flux core circuit structure, wherein a material of the fusible element has a melting temperature so that the material of the fusible element melts when an ambient temperature is higher than the melting temperature, and so that the material of the fusible element accumulates at the connections sites due to a surface tension and breaks the electrical connection that is created by the fusible element, wherein the connection sites are arranged at corresponding contact bridges of the circuit structure, wherein the circuit structure comprises at least one idle power section that does not contribute to current supply, the at least one idle power section positioned on a line arm section of the circuit structure which extends along a side of the corresponding contact bridges, wherein the at least one idle power sections are connected with conductor paths that lead to the corresponding contact bridges, the conductor paths arranged traversely to a connection direction of the fusible element, and wherein the circuit structure is surrounded by a sheathing, wherein the at least one idle power section is arranged and configured as a relief structure which ensures a fixing in the sheating, so that mechanical tensions are released by the relief structures to the sheathing.