PRG18BB101MB1RB

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PTC Resettable Fuses - PRG18BB101MB1RB Application Field and Working Principle

PTC Resettable Fuses are self-resetting, polymeric-based positive temperature coefficient devices, commonly known as polyfuses. First introduced in the 1980s, these unique fuses are used in a variety of applications, including point-of-load switching circuit protection, over-current protection in motor control systems, and over-voltage protection in high-power AC/DC applications. The PRG18BB101MB1RB is a popular PTC Resettable Fuse, and this article will provide an overview of its application field and working principle.

Applications

The PRG18BB101MB1RB PTC Resettable Fuse is suitable for a wide range of applications, including Type III over-voltage or over-current protection in AC/DC power supplies, as well as point-of-load switching circuit protection. It is tested to UL1449 4th Edition standards, and meets EN 60950-1 and EN/IEC 60950-22 Safety Regulations. In addition, it is UL/cUL recognized, and meets the RoHS Directive.

Working Principle

PTC Resettable Fuses work on a simple principle that involves the melting of a protective fuse element when the current load exceeds its rating, due to an over-voltage or over-current condition. In the PRG18BB101MB1RB PTC Resettable Fuse, this is accomplished by a unique "hot-melt" technology. As the current through the fuse reaches a predetermined value, the heat output from the fuse element rises sharply and the element melts. Melting of the element expands and instantly isolates the short-circuit, thereby protecting the downstream circuit components. The fuse element then self-cools and resets itself, allowing normal current to resume.

Conclusion

The PRG18BB101MB1RB PTC Resettable Fuse provides a reliable and easy-to-install protection solution for a multitude of applications. It offers high current protection and high resistance to hot-spots, has excellent clamping characteristics, and can be customised to suit a wide range of AC/DC power systems, including Type III over-voltage or over-current protection. Its unique “hot-melt” technology ensures that the fuse element quickly and reliably melts to protect the downstream circuit components, and then self-cools and resets itself afterwards.

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