LR4-450F

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PTC resettable fuses have gained popularity among the surge protection field in recent years due to their protective capabilities. These devices are designed to automatically disconnect power to a circuit or device when a set of conditions is met. This is accomplished by monitoring current, temperature, or both, over time, and then protecting the device from damage caused by electrical overloads. The LR4-450F is an example of this kind of solution.

The LR4-450F is a small, compact device, making it suitable for a variety of applications. It features a unique design that is both robust and easy to install. The device is designed to be hung up with mounting pins, or clipped onto a terminal block. It can be used with a variety of currents, up to a rated current of 4.5A.

The device operates with a simple yet effective principle. It consists of a polymeric positive temperature-coefficient (PPTC) resistor and an electronic circuit, which interact to provide automatic protection against overcurrents or surges. Whenever the current rises above a preset threshold, the PPTC resistor begins to generate heat. This heat will eventually increase the resistance of the PPTC resistor, diverting the current away from the protected equipment and allowing the circuit to be shut down safely. This heating also begins to reduce the current back to the nominal level, thus protecting the device from further damage.

The LR4-450F also features a separate SOC control, which is separate from the PPTC resistor. The SOC control is designed to detect overvoltage and power-on-reset conditions, providing extra protection. It helps protect the device from false triggering by detecting environmental conditions such as temperature and humidity changes.

LR4-450F PTC resettable fuses are ideal for applications where current protection is needed but where permanent secondary protection is not feasible. The device is capable of carrying higher surge currents than standard thermal-magnetic fuses, which makes it difficult for them to cause overcurrents or surges. The device is also tolerant of temperature changes, so it can be used in extreme environments and temperatures. Overall, the LR4-450F provides an effective, reliable and cost-effective protection solution for a variety of applications.

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