Inside a defrost thermostat and thermal fuse

Quite an interesting and cost-engineered construction.

The thermal fuse turns out to have a sliding contact that is held in place against a contact in the ceramic cap by the short and more powerful spring that is also pressing against a compound that melts at a specific temperature. When it does melt, the spring is pushed down into the melted compound (which may have been the powder by the time I'd squashed it), and the weaker spring then pushes the sliding contact down away from the ceramic cap's contact and breaks the circuit.

The tough plastic sleeve with the end crimped around the wires is a very clever way of making a sealed package for use in a wet environment. A fascinating bit of cost-engineering.

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