LR4-170UF

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PTC resettable fuses are a type of circuit protection device which has recently become popular due to its ability to provide both protection and convenience when dealing with problematic electrical systems. The LR4-170UF application field and working principle are just one example of a PTC resettable fuse that can be used in these types of systems.

The LR4-170UF is a single-input, self-resetting device specifically designed for automotive applications. It is a power control device based on a 680V PTC element and operates in a temperature range from -40°C to +85°C. It has two ports, the primary port and the secondary port, and is typically used as an over-current protection device for a 12V power system.

The working principle of the LR4-170UF is based on the PTC element, which is basically a temperature sensitive resistor. When the current flowing through the primary port exceeds the rated current, the PTC element will instantly heat up and increase its resistance, thus limiting the current flow and protecting the circuit from short-circuits or overloading. As the temperature increases, so does the resistance of the element, until it reaches a point where it will no longer allow any current through. When the primary port current falls below the rated current, the PTC element will cool down and reset to its original state, thus allowing current to flow again.

The LR4-170UF PTC resettable fuse has wide application field. It can be used in a variety of automotive applications such as vehicle power systems, charging systems, DC/DC converters, ECUs, EPS systems, power inverters, and many others. The fuse is especially suitable for high-power applications where exact temperature control is required. It is also highly reliable and durable, with a long life expectancy of up to 10 years.

The LR4-170UF PTC resettable fuse is a versatile and reliable device that provides effective circuit protection as well as convenience for those dealing with complex automotive electrical systems. This fuse is a great option for those looking for an effective and reliable way to protect their vehicles and other electrical components. With its simple and efficient working principle and wide range of applications, the LR4-170UF PTC resettable fuse is a great choice for any automotive applications requiring reliable circuit protection.

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