As we all know, there are more and more kinds of fuses. Facing all kinds of fuses, we will unconsciously think: Which kind of insurance is better? Disposable fuses and self-recovery fuses are two commonly used fuses. Which of these two fuses is cost-effective? Today, Xiaobian will analyze their similarities and differences for everyone.
Structurally, the self-recovery fuse is composed of polymer, which is essentially a thermistor with positive temperature coefficient. It plays a circuit protection role through the positive correlation between the resistance value of PTC material and the sudden change of internal temperature point, and can be reused without frequent replacement. Disposable fuses are made of common fuse materials, which cannot be used after each action and need to be replaced frequently.
They can be used interchangeably on many occasions. For example, in battery protection applications where overcurrent protection requirements are not high, these two products can take the lead or even be used instead, but most of the time, they still have their own fields.
In some important device protection applications such as IC, or at the input/output end of the power supply, only one-time fuse can be competent for its protection function, and these parts have higher requirements for impedance. In some cases where products must be avoided from burning out due to overheating, interface overcurrent protection which often requires hot-plug operation can simply eliminate faults, while temporary overcurrent circuit protection caused by non-device faults should choose self-recovery fuse.
In terms of internal resistance value, disposable fuse is smaller than self-recovery fuse. In terms of current sensitivity, the disposable fuse is higher than the self-recovery fuse. In terms of running time, disposable fuse is faster than self-recovery fuse. In terms of leakage current, the disposable fuse does not leak, while the self-recovery fuse leaks. In terms of aging speed, disposable fuses are slower than self-recovery fuses. In terms of safety, disposable fuse is stronger than self-recovery fuse. In the application range, there are more disposable fuses than self-recovery fuses.
Although there are great differences between disposable fuse and self-recovery fuse, it does not prevent self-recovery fuse and disposable fuse from coexisting in the market. In addition, the price of disposable fuses will be higher than that of self-recovery fuses, which affects people's choice to a certain extent. How to choose depends on the specific model parameters of the product.
