Thermal monitoring
Many electrical devices are protected against damage due to overheating by means of thermal protection. Various methods are used for this. The simplest solution is the classic thermal fuse or fusible link. If too much current flows through the fuse, it heats up so much that it melts, thus breaking the electrical connection. This variant is very cost-effective, but a new thermal fuse is needed after tripping.
Bimetal switches, on the other hand, open an electrical contact at a predefined temperature. When the bimetal switch cools down again, the contact closes again and the unit can continue to be operated. This solution is non-destructive. With sensors such as Pt100 sensors or PTC thermistors, temperatures can only be monitored or signalled. The switch-off then takes place at another point.
