Previous Video on my channel of how to disassemble Aeroccino 4!
Thermal fuses work in a similar way to electrical cartridge fuses; when the conditions exceed a certain limit, the circuit will be broken. For thermal fuses, the limit is based on temperature. Thermal fuses typically contain a small pellet within them or have a thin piece of wire which melts at a certain temperature. When the pellet or piece of wire melts, the circuit breaks. This is called 'blowing out' or 'burning out'.
Suitable Part available online (not affiliated)
BOJACK SF129E SEFUSE 10A 250V Thermal Fuses 133 Degrees Celsius Thermal Cutoffs (Pack of 10 pcs)