There are various ways to form temperature fuses, mainly including the following three common types:
1. Organic type temperature fuse
It is composed of movable contacts, springs, and melts. The current enters from the left lead and flows through the casing to the right. When the temperature reaches the preset value, the organic material can melt, the spring compresses, the contact separates from the left lead, and the circuit is cut off.
2. Ceramic tube type temperature fuse
Composed of lead wires, fusible alloys, special mixtures to prevent oxidation, and insulating ceramic tubes. As the temperature rises, the resin mixture liquefies, and the alloy shrinks under surface tension, permanently disconnecting the circuit.
3. Square shell type temperature fuse
Composed of easily melted gold wire and special resin coating, when the ambient temperature rises, the alloy melts into a spherical shape, disconnecting the circuit between the two pins.
When using temperature fuses, the following points should be noted:
1. Ensure the selection of appropriate parameters, such as rated current, voltage, and melting temperature.
2. The installation position should avoid stress caused by vibration or movement of accessories.
3. The installation location should avoid excessive temperature.
4. Not suitable for high humidity or liquid environments.
5. Ensure that only temperature sensing is applied to the heat source, and set isolation if necessary.
6. Avoid internal contact damage caused by overcurrent and overvoltage.
Special mention is made of thin temperature fuses, which are used for over temperature protection of lithium-ion batteries. Once the internal temperature of the battery rises, they will quickly melt to protect user safety. Although there are drawbacks such as irreversibility, this is an advantage in ensuring personal safety. At present, the temperature fuses on the market, such as 98 ℃ and 92 ℃ models, have a clear range of melting temperature at a specific heating rate.
Classified by material and temperature, temperature fuses come in different types such as metal shells, plastic shells, and oxide film shells, with a wide range of melting temperatures from 70 degrees to 320 degrees.
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