What is a thermal fuse?
The temperature fuse is the same as the fuse we are familiar with. It usually acts as a path for the power supply on the circuit. If it does not exceed its rating during use, it will not blow and will have no effect on the circuit. It only blows off the power circuit when the appliance malfunctions and generates an abnormal temperature. This is different from the fuse, which is blown by the heat generated when the circuit exceeds the rated current.
The temperature fuse has the characteristics of accurate fusing temperature, high withstand voltage, small size and low cost. The rated temperature value and the rated current value are marked on the outer casing of the thermal fuse, and the identification is not difficult, and the use is also very convenient. It can be widely used in electrical equipment, electric heating equipment and practical electrical appliances for overheat protection.
The temperature fuse mainly has the following parameters:
1) Rated temperature: Sometimes it is also called action temperature or fusing temperature. It refers to the temperature rising to the fusing temperature at the rate of 1 ℃ per minute under the condition of no load.
2) Fusing accuracy: It is the difference between the actual fuse temperature of the thermal fuse and the rated temperature.
3) Rated current and rated voltage: General temperature fuses have a certain margin for your current and voltage, usually 5A and 250V.
The thermal fuse is a one-time protection element. Its stem effect depends not only on the performance of the component itself, but more importantly on how to properly select and install the thermal fuse. Temperature fuses are typically connected in series in the circuit. Therefore, the temperature fuse must be selected so that its rated current value is greater than the current used in the circuit, and the current through the thermal fuse must never exceed the specified rated current value. Before selecting the temperature fuse's rated temperature, it is necessary to understand and actually measure the temperature difference between the temperature to be protected and the position of the mounting temperature fuse. In addition, the length of the fusing time and the availability of ventilation, etc., are also closely related to the temperature rating of the selected thermal fuse.