LR4-380LF

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PTC resettable fuses are a form of overcurrent protection device designed to limit the amount of current passing through a circuit. In comparison to conventional fuses, these self-resetting devices are distinguished by their ability to resume normal functioning once current is cut off and the fault is cleared from the circuit. As such, they are ideal for applications where regular fusing would be impractical or inefficient, and provide a number of benefits over traditional fuse types.

The LR4-380LF from Littelfuse is a fuse designed specifically for use in low-voltage applications. It is an economical option that provides electrical and circuit protection while delivering superior overcurrent protection. This PTC resettable fuse helps to prevent damage to apparatus from excessive currents, including overvoltage, short-circuiting, overload, and motor stall. The device is designed to automatically reset when current rises above its maximum rated current, meaning that the risk of a system failure is minimized.

The LR4-380LF is a single-pole device, meaning it has only one connection and protects one protected circuit. It features an easily visible and replaceable fuse element that shows when blown or open status. As a Class A device, the LR4-380LF requires only minimal time to activate and reset itself, making it ideal for applications where quick response is needed. The device has a rated current of up to 2.5A, a voltage of up to 380V, and an open-circuit voltage of up to 4.0V.

The LR4-380LF works on the principle that when the system experiences an overload or short circuit event, an internal heating element heats up the PTC thermistor, which acts as a switch. As the temperature of the thermistor rises, its resistance increases, effectively limiting the amount of current passing through the circuit. When the current falls below the normal operating level, the thermistor cools and lowers its resistance, meaning that the circuit can resume normal functioning. This process takes mere seconds, and the device can be reset multiple times until it eventually needs to be replaced.

The LR4-380LF is suitable for a wide range of applications, including low-voltage power supplies, DC-to-DC converters, motor controllers, lighting systems, and telecoms. The device can also be used in high-temperature applications, as it is rated for temperatures of up to 149°C. It is also resistant to corrosive atmospheres, making it suitable for use in harsh environments.

The LR4-380LF is a reliable and cost-effective choice for applications demanding high current protection in a small form factor. It is easy to install and requires minimal maintenance, meaning that it can be used in a variety of applications with minimal disruption to normal operations. This PTC resettable fuse from Littelfuse is suitable for use in both domestic and commercial settings and provides superior overcurrent protection.

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