What is PTC fuse?
Positive temperature coefficient (PTC) Reseatteable FUSE protects electronic devices if an excessive current or heat is generated. The devices generally increase the level of resistance on a particular threshold. PTC fuse reacts by physical change that inhibits excess current from travel over the circuit. The response type depends on whether the device is a ceramic fuse or a polymer fuse. PTC fuses can be used in automotive, consumer electronic or industrial applications.
Ceramic fuses were the first type of PTC fuse developed and consisting of polycrystalline substances containing Titanate Barya and other compounds. Crystal grains in the fuse perform electricity and allow the current that produces heat. When the current or temperature rises behind the established threshold, the compounds form a barrier that prevents granular compounds from performing electricity. This limits the amount of current passing. If enough heat is generated, this type P may beFerroelectric and reverse the flow flow in the opposite direction.
PTC polymer fuse contains a combination of polymer crystals and conductive carbon granules. Under normal conditions, carbon granules allow the current. When the current levels increase above the established level, polymer crystals are subject to physical change and do not be crystallized. As this happens, the polymer expands and disrupts the clutches between the carbon granules, limiting the amount of current available. Polymer fuses generally make temperature changes meaningful and react faster than their ceramic counterparts.
As soon as the electrical failure passes or is interrupted, the PTC fuse is reset when the amorphic substances cool and return to the original crystalline state. Although the device may be incorporated into any number of applications must have a sufficient expansion room to work effectively. Fuse JSOU available in different styles and sizes. Each fuse has a holding or threshold values measured in amps. Polymer fuses also have a maximum voltage rating.
In the United States, in order for PTC fuses to reach certain tests, PTC must receive the seal of the laboratory. The fuse must remain functional after 6,000 trips or after 1,000 permanent current, which exceeds the threshold. Fuses designed for telecommunications equipment can have different standards. These devices are generally not intended for use in electronic applications where the recommended amount of current is continuously exceeded.