CMF-SDP10A-2

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PTC Resettable Fuses

A PTC resettable fuse, also known as a polymeric positive temperature coefficient (PPTC) resettable fuse, is a type of overcurrent device used as a circuit-protection component. This type of resettable fuse has the capability to reset upon breaking, hence eliminating the need for costly time-consuming and dangerous replacements. The CMF-SDP10A-2 is an example of a PTC resettable fuse.

Application Field

This type of PTC resettable fuse seeks to provide protection against temporary or sustained overloads. It is most commonly seen in consumer applications such as mobile phone chargers, personal electronics, and other consumer electronic devices. In addition, due to the physical properties of these devices, they can also be found in automotive applications, from miniature fuses to mini-ATMs and appliances.

Working Principle

The working principle of this type of PTC resettable fuse is based on the principle of self-regulation. This means that, under a certain surge in current, the PTC fuse will increase its own resistance. This increase in resistance causes a reduction in current, which reduces or eliminates the overload. This process is known as "self-resetting" and differs from conventional fuse technology in that the fuse does not require replacement after a current spike.

The technology behind the PTC resettable fuse relies on a special polymer material, which changes its properties with an increase in temperature. This is known as the “positive temperature coefficient" or "PTC". A current surge, or a sustained high temperature, will cause the resistance of the polymer to increase and the applied current will decrease, so long as the temperature of the PTC does not exceed its rated value. This increase in current brings the device back to its original condition, allowing for a reset and without the need of changing or replacing the fuse.

The CMF-SDP10A-2 PTC resettable fuse comes in two different versions: 4mm and 5mm. The total hold current range for the 4mm version is from 0.70A to 12A and the total hold current range for the 5mm version is from 0.70A to 15A. The operating temperature is -40°C to +90°C, with a voltage rating of AC/DC 15V-230V, and a temperature rise of 6K.

Conclusion

The CMF-SDP10A-2 PTC resettable fuse, is an example of a resettable fuse used to provide circuit protection against both temporary or sustained overloads. This type of fuse is found in consumer applications such as mobile phone chargers, personal electronics, automotive applications, and appliances. Its working principle is based on a polymer material with a “positive temperature coefficient” or “PTC” which increases its own resistance. Hence, it does not require replacement after a current spike. It comes in two versions: 4mm and 5mm, with a voltage rating of AC/DC 15V-230V, and a temperature rise of 6K.

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