20LR730SU

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PTC Resettable Fuses: 20LR730SU Application Field and Working Principle

PTC resettable fuses, or polymeric positive temperature coefficient (PPTC) resettable fuses, are electronic components designed to be an over-current protection device. They are used in place of traditional fuses and possess several advantages over traditional fuse technology. 20LR730SU is the most popular and widely used PPTC device.

What is the 20LR730SU?

20LR730SU is a device that is particularly designed to fuse the electrical circuits as well as being able to reset itself after a overload. It has a current rating of 0.3 Amp and a voltage rating of 30V. It has a nominal resistance of 0.4 ohms with a tolerance of ±10%. It is typically made from polymeric material, giving it high temperature and humidity resistance. It measures 4.7mm×5.4mm×3.8mm making it a very small device for protection against over-current.

Application Fields

20LR730SU are best suited to be used in electrical circuits that require over-current and short-circuit protection. Common applications for these devices include computer power supplies, 1/3/5 watt LED lighting, battery packs, notebooks and other portable electronics, electric motors, industrial equipment, vending machines, medical equipment and automotive applications. These devices have ultra-small footprints, therefore they are suitable for automotive applications where PCB space is limited.

Working Principle

20LR730SU is a thermal device, so the re-settable function of it is based on its mechanical structure and working principle. The device contains a mechanical structure made of a conducting post and a polymer disk, as well as contact plates attached to the conducting post. When current flows through the PTC fuse, the polymer disk melts and the conducting post is pushed upwards, making the contact plates close. This creates an additional short circuit in the circuit and thus protects it.

When the over-current situation disappears, the PTC fuse cools down and the polymer disk contracts. As a result, the conducting post is pushed downwards, separating the contact plates and opening the short circuit. The PTC fuse will now be reset and ready for another over-current situation.

Conclusion

20LR730SU are widely used in a variety of electronic circuits and have several advantages over traditional fuse technology. It is a device that is specifically designed to fuse the electrical circuits as well as being able to reset itself after an overload. It also has a current rating of 0.3 Amp and a voltage rating of 30V, with a nominal resistance of 0.4 ohms and a tolerance of ±10%.

PPTC devices are highly reliable components that provide effective protection from over-currents. As they are able to reset themselves after an overload, they reduce downtime and save costs. This makes them an appealing option for a wide variety of applications.

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