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PTC Resettable Fuses

A PTC Resettable Fuse (PRG15BC4R7MM1RC) is a self-resetting temperature-sensitive protection device that limits inrush currents into an application by opening a circuit, or breaking the continuity, during an overload or short circuit condition. Over-current can be caused by too much power draw on a device, incorrect wiring, defective components, or outside interference. The PTC Resettable Fuse trip current (i.e. the maximum amount of current that can be drawn) is accurately preset and is designed to break the circuit and protect equipment downstream, without the need for a maintenance-prone fuse or breaker.

Application Fields

PTC Resettable Fuses like PRG15BC4R7MM1RC are ideal for protecting applications that take in mains voltage such as network hardware, computers, peripherals, consumer electronics, and IT related products. Examples include routers, wifi boosters, smart plugs and switches, modems, hard drives, TVs, sound systems, and various other domestic appliances.

The PRG15BC4R7MM1RC is also commonly used in aerospace and military applications. These include aircraft instruments, switching systems, fuel systems, navigation, fire-control, weapons systems, communication systems, radar systems, remote monitoring systems, sensors, power systems, and actuation systems.

Working Principle

At low current levels, the PTC Resettable Fuse works just like a regular fuse, allowing current to flow freely. However, once a pre-determined trip level or over-current level is reached, the fuse opens, breaking the circuit and limiting further current surge. The circuit remains open until the power is shut off and the temperature of the fuse returns to ambient level, at which point the fuse automatically resets and reconnects the circuit.

The PRG15BC4R7MM1RC has a high accuracy trip current of 4.7A, making it highly reliable in protecting systems against over-current and over-temperature conditions. The fuse also has a wide operating temperature range of -55°C to +125°C, and is UL recognized, CSA certified, and RoHS compliant.

Conclusion

PTC Resettable Fuses are reliable, cost-effective solutions for protecting mains-powered systems, military applications, and other high-power systems from over-current and over-temperature conditions. The PRG15BC4R7MM1RC is a particularly highly accurate and robust resettable PTC fuse, with a 4.7A pre-determined trip level, a wide operating temperature range, and various certifications.

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