NEWS

Longde Science: The role of thermal fuses in circuits


Release Time:

2020-07-30

Thermal fuse, also known as thermal fuse, is a new type of electrical overheating protection element. This kind of component is usually installed in electrical appliances that are prone to heat. Once the electrical appliance fails and generates heat, when the temperature exceeds the abnormal temperature, the thermal fuse will automatically fuse, cut off the power supply, and prevent the electrical appliance from causing a fire. In recent years, most of the household electrical appliances with heating as the main function in our country, such as electric rice cookers, electricity bills, electric stoves, etc., are mostly equipped with thermal fuses, which can cut off the power in time when the internal parts of the machine fail to prevent further electrical appliances. Damage, but also put an end to the resulting fire. The thermal fuse is the same as the fuse we are familiar with. It is usually only used as a power supply path on the circuit. If it does not exceed its rated value during use, it will not be blown and will not have any effect on the circuit. Only when the appliance fails and produces abnormal temperatures, it will fuse and cut off the power circuit. This is different from fuse fuses, which are blown by the heat generated when the rated current is exceeded in the circuit. Thermal fuses have the characteristics of accurate fusing temperature, high withstand voltage, small size and low cost. The rated temperature value and rated current value are marked on the shell of the thermal fuse, which is easy to identify and very convenient to use. It can be widely used in electrical equipment, electric heating equipment and practical electrical appliances for overheat protection. The thermal fuse mainly has the following parameters: ①Rated temperature: sometimes called operating temperature or fusing temperature, it refers to the temperature at which the temperature rises at a rate of 1°C per minute to fusing temperature under no load. ②Fusing accuracy: refers to the difference between the actual fusing temperature and the rated temperature of the thermal fuse. ③ Rated current and rated voltage: The nominal current and voltage of the general thermal fuse have a certain margin, usually 5A and 250V. The thermal fuse is a one-time-use protection component, and its use effect depends not only on the performance of the component itself, but also on how to correctly select and install the thermal fuse. When the thermal fuse is used, it is generally connected in series in the circuit. Therefore, when selecting the thermal fuse, the rated current value must be greater than the current used in the circuit, and the current through the thermal fuse is never allowed to exceed the specified rated current value. Before selecting the rated temperature of the thermal fuse, it is necessary to know and actually measure the temperature difference between the temperature that needs to be protected and the location where the 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.

Thermal fuse, also known as thermal fuse, is a new type of electrical overheating protection element. This kind of component is usually installed in electrical appliances that are prone to heat. Once the electrical appliance fails and generates heat, when the temperature exceeds the abnormal temperature, the thermal fuse will automatically fuse, cut off the power supply, and prevent the electrical appliance from causing a fire.

In recent years, most of the household electrical appliances with heating as the main function in our country, such as electric rice cookers, electricity bills, electric stoves, etc., are mostly equipped with thermal fuses, which can cut off the power in time when the internal parts of the machine fail to prevent further electrical appliances. Damage, but also put an end to the resulting fire. The thermal fuse is the same as the fuse we are familiar with. It is usually only used as a power supply path on the circuit. If it does not exceed its rated value during use, it will not be blown and will not have any effect on the circuit. Only when the appliance fails and produces abnormal temperatures, it will fuse and cut off the power circuit. This is different from fuse fuses, which are blown by the heat generated when the rated current is exceeded in the circuit.


Thermal fuses have the characteristics of accurate fusing temperature, high withstand voltage, small size and low cost. The rated temperature value and rated current value are marked on the shell of the thermal fuse, which is easy to identify and very convenient to use. It can be widely used in electrical equipment, electric heating equipment and practical electrical appliances for overheat protection. The thermal fuse mainly has the following parameters:


①Rated temperature: sometimes called operating temperature or fusing temperature, it refers to the temperature at which the temperature rises at a rate of 1°C per minute to fusing temperature under no load.
②Fusing accuracy: refers to the difference between the actual fusing temperature and the rated temperature of the thermal fuse.
③ Rated current and rated voltage: The nominal current and voltage of the general thermal fuse have a certain margin, usually 5A and 250V.

The thermal fuse is a one-time-use protection component, and its use effect depends not only on the performance of the component itself, but also on how to correctly select and install the thermal fuse. When the thermal fuse is used, it is generally connected in series in the circuit. Therefore, when selecting the thermal fuse, the rated current value must be greater than the current used in the circuit, and the current through the thermal fuse is never allowed to exceed the specified rated current value. Before selecting the rated temperature of the thermal fuse, it is necessary to know and actually measure the temperature difference between the temperature that needs to be protected and the location where the 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.