20LR450U

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PTC Resettable Fuses

Resettable Polymeric Positive Temperature Coefficient Fuses, commonly referred to as PTC fuses or resettable fuses, are a reliable and cost-effective solution for over-current protection. 20LR450U PTC fuses prevent the damage that can be caused by an overload or current spike by quickly breaking down the electrical connection between power source and the affected device.

Application Field of 20LR450U PTC Fuses

The 20LR450U PTC fuse is ideal for protecting appliances, automotive electrical systems, and communication systems. It’s also suitable for high-frequency SMPS, consumer electronics, office equipment, power supplies, PC’s, LED lighting and home appliances. In addition, they are an essential component in current transformers, meters, UPS, AC/DC adapters, and any device with components that can be damaged by high levels of current.

Working Principle of 20LR450U PTC Fuses

The 20LR450U PTC fuse is a unique form of technology engineered to detect electric current overloads and quickly respond by breaking the power connection. A PTC element consists of a combination of polymers, ceramics, and conductive particles. When the PTC element experiences a current overload, it quickly heats up and expands, pushing the conductive particles away from each other. This causes the resistivity of the element to sharply increase, which quickly breaks the electrical connection. Once the overload is eliminated, the element cools down and returns to its original state. The power connection can then be restored quickly and easily.

Benefits of PTC Resettable Fuses

The greatest advantage of 20LR450U PTC fuses is their ability to reset automatically, providing protection against electrical overload without the need for replacement. They also offer improved safety by providing more reliable over-current protection than other types of fuses. In addition, they are smaller and less expensive than traditional over-current protection devices, and they require no maintenance or special installation.

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