resettable fuse hold current.Introduction to the Classification of Self Recovery Fuses

　　Self recovery fuses can be divided into two types based on material: polymer polymer PPTC and ceramic CPTC. They can also be divided into two types based on packaging form: lead inserts and SMD patches. It can also be divided into 600V, 250V, 130V, 120V, 72V, 60V, 30V, 24V, 16V, 6V, etc. based on the voltage.

　　The main advantages of polymer PPTC are: zero power resistance can be made very small at room temperature, high current products only have a few milliohms, low power consumption in the circuit, negligible, and relatively small volume. It can be connected in series in vulnerable circuits for overcurrent protection and temperature fuse, with fast resistance mutation speed, in the order of several milliseconds, small heat capacity, short recovery time, impact resistance, and can be protected for up to 8000 cycles. PTC can be used as a temperature fuse, so it reflects the performance and function of temperature fuses to a certain extent in the circuit. Achieve dual protection functions of overcurrent protection and over temperature protection in the circuit.

　　The main advantages of ceramic CPTC are easy to manufacture and relatively cheap, but it has large resistance, large volume, and high in circuit losses, ranging from tens to thousands of Ω. It is suitable for small current overcurrent protection. When high-temperature overheating occurs, negative resistance effect (resistance value decreases) is prone to occur, and the protection speed is slow. In the order of hundreds of ms, the heat capacity is large, and the recovery time is long. The application scope is relatively narrow, such as circuits that cannot be applied for fast protection, automotive wiring harness protection, PCB trace protection, etc. It is mostly used for heating devices, and can be selected in some small signal circuits where losses do not need to be considered.

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