Patent ID: 7911314

Claim:
An electric circuit comprising: a connection for a current source; an electric load; a thermal-mechanical fuse for interrupting a current feed to the load, the fuse comprising: a spring having two ends, at least one of the ends being soldered to a solder point on a bus bar, the solder point being under mechanical pretension by a spring restoring force, the pretension separating the soldered joint between the spring end and the solder point when the solder melts at the solder point; and a thermosensitive mechanical spring support connected in a heat conducting manner with a heat source, disposed between the spring ends and withstanding the spring restoring force at temperatures that occur at the support during faultless operation of the electric circuit, but yielding, due to the increase of said temperatures, to the spring restoring force when the solder at the solder point melts for enabling spring separation from the solder point.