LR4-190F

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PTC Resettable Fuses

PTC Resettable Fuses are an effective form of over current protection that uses a positive temperature coefficient solid state resistor that switches from the low-impedance conduction state to a high-impedance non-conducting state upon the application of an over current. Compared with traditional, PTC resettable fuses are preferable, because they have advantages which those traditional fuses cannot replace. The LR4-190F is an example of a PTC Resettable Fuse that can also be used in various applications.

LR4-190F Application Field

The LR4-190F PTC resettable fuse is ideal for multiple protection circuits, such as digital battery powered appliances, and portable electronic devices. Not only it can be used in consumer electronics, but also is widely applied in the household products, electric apparatus, computers, and medical equipment etc. In addition, this fuse can offer protection against unexpected short circuit, over load and over temperature, and against the destructive effects of voltage and current conditions. Because of this, the LR4-190F PTC Resettable Fuse meets the safety requirements and eliminates the need to install physical fuses for a much safer and smarter usage experience.

LR4-190F Working Principle

The LR4-190F PTC Resettable Fuse is composed of a Positive Temperature Coefficient (PTC) element, a temperature sensing element, and a circuit protective element. When a short circuit, over-load or over-temperature occurs, the current rises and the temperature of the PTC element increases, which increases the electrical resistance — thereby depleting the current flow. This action prevents the current in the circuit from further rising, limiting dangerous spikes and protecting the circuit from further damage. The fuse will reset itself upon removal of the over-current condition.

This fuse utilizes a temperature indicating element that allows the fusing characteristics of the PTC element to be determined accurately. The temperature indicating element is located in the middle of the fuse body and is made of material with different fusing temperatures. When the temperature of the PTC element rises above a predetermined level, the temperature indicating element will melt which serves as an indication of an overload.

Conclusion

Growing concerns over safety and the need to protect both devices and users from the damaging effects of electrical conditions has led to the increased adoption of PTC Resettable Fuses. The LR4-190F resettable fuse is the ideal alternative if users are looking for a cost-effective, all-in-one protection device. With its advantages over the traditional fuse, its application field spans portable electronic devices, household appliances, electric apparatus and medical equipment, and is very capable of protecting the connected devices from over-current and other hazardous conditions.

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