RHEF600S

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PTC Resettable Fuses (also known as polymeric positive temperature coefficient resettable fuses) are a special type of low resistance device suitable for overcurrent protection. Resettable fuses are widely used in consumer electronics, automotive, and aviation applications. RHEF600S is one such fuse from Littelfuse, providing improved safety, reliability, and performance. This article will provide an overview of the RHEF600S application field and working principle.

Application Field

The RHEF600S is a resettable polymeric positive temperature coefficient (PPTC) fuse designed to be used in a variety of low-voltage applications, including consumer electronics, automotive, and aviation. It is highly resistant to heat, vibration and moisture, making it an ideal choice for use in harsh environments. It is also RoHS compliant, which provides an environmental exemption for customers.

The device is suitable for providing overcurrent protection in a wide variety of electronic components, including automotive relays, fuel pumps, inverters, and more. The RHEF600S is also ideal for protecting lower-power circuits, such as DC motor controllers, energy-efficient appliances, and other electronic components. The device is designed for use in direct current (DC) circuits with a voltage rating of 6 volts.

Working Principle

The RHEF600S utilizes a unique polymeric positive temperature coefficient (PPTC) technology to provide overcurrent protection. When the current through the device exceeds its rated value, the polymer will heat up and then form an open circuit, effectively disconnecting the load from the power supply. This will prevent any potential damage or destruction to the circuit.

When the overcurrent has stopped, the polymer will cool down and reset itself back to its original state, allowing the current to pass through the device again. While it is in the reset state, the device has very low resistance and resistance will continue to increase until the overcurrent occurs again. This ensures reliable and safe operation, even in the event of an overcurrent.

The RHEF600S also offers PTC thermal protection, which prevents the device from overheating. By constantly monitoring the temperature, the PTC can detect when the ambient temperature is too high and shut off the circuit to prevent the device from becoming damaged. This provides an added layer of safety and reliability, making the device ideal for use in harsh environments.

Conclusion

The RHEF600S is a resettable polymeric positive temperature coefficient (PPTC) fuse designed to provide overcurrent protection in a variety of applications. It is highly resistant to heat, vibration, and moisture, making it an ideal choice for use in harsh environments. Its low voltage rating of 6 volts makes it ideal for protecting lower-power circuits, such as DC motor controllers, energy-efficient appliances, and other electronic components. The device also offers PTC thermal protection, which prevents overheating and ensures reliable and safe operation.

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