LR4-1300F

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PTC Resettable Fuses are quickly becoming a viable alternative to traditional fuses in a variety of applications. This type of fuse provides a safe and reliable overcurrent protection solution for a range of electronics and electrical components. One of the most popular models of resettable fuse is the LR4-1300F. This article will discuss the application field of the LR4-1300F and the working principles behind the device.

The Unique Properties of PTC Resettable Fuse

A key feature of PTC Resettable Fuses is that they are self-resetting. This means that after a failure, the fuse will automatically switch back on. This eliminates the need for a technician to physically reset the fuse, saving time, money and potential safety risks. Furthermore, these fuses can protect a variety of circuits from different current surges. When the surge passes, the fuses will switch back on and continue to protect the connected components.

LR4-1300F application field

The LR4-1300F resettable fuse is suitable for applications that require a high current capacity. It can protect circuits exposed to current surges up to 30A. As a result, the LR4-1300F is a popular choice for automotive, industrial and consumer electronic applications, such as power supply protection, motor control circuits and AC/DC adapters.

LR4-1300F Working Principle

The LR4-1300F resettable fuse works by using a thermally activated resistor, known as a PTC (positive temperature coefficient) device. The PTC device is made up of a metal oxide paste sandwiched between two conductive plates. When current passes through the PTC device, it produces heat which then causes the resistance of the device to increase. This rise in resistance generates a voltage drop which interrupts the circuit and protects the connected components from any further damage.

The LR4-1300F also uses a current limiting circuit. This circuit monitors the flow of current through the fuse in real-time. When the current flow reaches a pre-determined level, the circuit will limit the amount of current passing through the fuse and quickly shut off the flow. This feature ensures that the device doesn’t experience thermal runaway or any other damage due to overcurrent, thus protecting the connected components.

In addition, the LR4-1300F uses a thermal fuse to guard against ever excessive temperature increases. This fuse is set to disconnect the device from the power source when the temperature rises above a certain threshold.

Advantages of LR4-1300F

The LR4-1300F provides a reliable solution for protecting a variety of circuits from overcurrent and temperature surges. Its self-resetting capability makes it easier to use and maintain than traditional fuses, as the user does not need to manually reset the device. The current limiting circuit also ensures that the device will not be damaged by excessive current flow, thus providing a higher level of safety. As a result, the LR4-1300F is an ideal choice for a wide range of applications.

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