Which is better, disposable fuse or self restoring fuse.surface mount fuse letter code

　　From a structural perspective, a self restoring fuse is composed of a polymer polymer, essentially a positive temperature coefficient thermistor. It provides circuit protection through the positive correlation between the resistance value of PTC material and temperature, as well as the sudden change at the Curie temperature point. It can be reused without frequent replacement; Disposable fuses are made of ordinary fuse materials, so they cannot be used again after each action and require frequent replacement.

　　From the perspective of working action, they can all be used for overcurrent protection of circuit currents and can be interchanged in many occasions. For example, in battery protection applications where overcurrent protection requirements are not too high, these two types of products can both lead the way and can even be replaced, and most of the time, each has its own field.

　　In the protection application of certain important devices such as ICs, or in the input/output terminals of power supplies, only disposable fuses can be competent for their protection functions, and these parts also have high impedance requirements; In situations where it is necessary to avoid burning products due to overheating, interface overcurrent protection that often requires hot swapping operation can easily eliminate faults, and circuit protection for temporary overcurrent caused by non device faults should choose self recovery fuses.

　　In terms of internal resistance value of the product, disposable fuses are smaller than self recovery fuses; In terms of current sensitivity, disposable fuses are higher than self recovery fuses; In terms of action time, disposable fuses are faster than self restoring fuses; In terms of leakage current, the disposable fuse does not leak and the self recovery fuse has leakage phenomenon; In terms of aging speed, disposable fuses are slower than self restoring fuses; In terms of safety, disposable fuses are stronger than self restoring fuses; Within the scope of application, there are more disposable fuses than self restoring fuses.

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