Mustang 2040 Thermal circuit breaker in engine bay?

[paulroyans]

Hello, Does anyone know what this does specifically? I had an issue with getting power to my ignition switch and discovered this had tripped. However after resetting it and using the machine for 30 seconds it trips again. Sometimes it doesn't actually trip i just have to wriggle the wires and i hear a clunk (which i can't locate) then it will allow the machine start. It could be a faulty circuit breaker which i am trying to source now, but failing that i will need to know what it does so i can start fault-finding. Any ideas? Thanks Paul

 

[Tazza]

I have seen thermal breakers on engines to prevent over heating, but never one just mounted to the frame....