What is a thermal fuse?

What is a thermal fuse?

Thermal fuse has the characteristics of accurate melting temperature, high withstand voltage, small size and low cost. The thermal fuse shell is marked with the rated temperature value and the rated current value, it is not difficult to identify, and it is very convenient to use. It can be widely used in electrical equipment, electric heating equipment and practical electrical appliances for overheating protection.

The thermal fuse mainly has the following parameters:

1. Rated temperature: Sometimes called operating temperature or fusing temperature, it refers to the temperature at which the temperature rises to the fusing temperature at a rate of 1°C per minute under no-load conditions.

2. Fusing accuracy: refers to the difference between the actual fusing temperature of the thermal fuse and the rated temperature.

3. Rated current and rated voltage: Generally, the nominal current and voltage of thermal fuse have a certain margin, usually 5A and 250V.

Thermal fuse is a one-time-use protection element. Its use effect not only depends on the performance of the element itself, but more importantly, how to select and install the thermal fuse correctly. The thermal fuse is generally connected in series in the circuit when it is used. Therefore, when choosing a thermal fuse, its rated current must be greater than the current used in the circuit. Never allow the current through the thermal fuse to exceed the specified rated current. Before selecting the rated temperature of the thermal fuse, you must understand and actually measure the temperature difference between the temperature to be protected and the location where the planting fuse is installed. In addition, the length of the fusing time and the availability of ventilation are also closely related to the selection of the rated temperature of the thermal fuse.