I am looking to see why my oil-filled rad has stopped working, and I have discovered that the small component in the middle of this wire must be at fault, but I don't know what it is

The working on it includes "141 deg C" so I am assuming its some sort of temperature fail-safe.....? The other writing on it is too smudgy to read.

The working on it includes "141 deg C" so I am assuming its some sort of temperature fail-safe.....? The other writing on it is too smudgy to read.
