MF-RHT550-2

Overview

The Bourns MF-RHT550-2-14 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse designed for high-temperature applications. It features a holding current of 5.5 A and a trip current of 10 A at rated voltage. The device supports a maximum operating voltage of 16 VDC with a maximum fault current rating of 100 A. Its initial resistance is 37 mΩ, and it operates within a temperature range of -40°C to +125°C. The component utilizes a 5.1 mm lead spacing and is supplied in reel packaging.

Feature Summary

• Provides overcurrent protection through automatic resistance increase during fault conditions
• Capable of resetting automatically after the fault condition is removed
• Engineered for reliable operation in elevated temperature environments

Applications

• High-temperature circuit protection
• Power supply input protection
• Battery pack safeguarding

Procurement Notes

Verify the complete part number including suffixes such as -14, which indicates specific packaging or tape-and-reel configurations. Confirm that the 16V rating aligns with the system's maximum operating voltage. Ensure the PCB layout accommodates the 5.1 mm radial lead spacing and allows for adequate thermal dissipation given the high-temperature design intent.

Selection Notes

Select this component when the circuit requires a holding current near 5.5 A and operates at voltages up to 16 VDC. The high-temperature rating makes it suitable for enclosures with limited airflow or ambient heat. Verify that the expected fault currents do not exceed the 100 A maximum rating to ensure proper device function without damage.

Part Context

This device belongs to the MF-RHT series from Bourns, which focuses on resettable fuses optimized for high-temperature performance. The series offers various current ratings while maintaining standard radial leaded formats for through-hole mounting. It serves as an alternative to traditional fusible links in applications requiring manual replacement is undesirable.

Replacement Considerations

Direct substitutes must match the 5.5 A holding current, 16 VDC rating, and radial package. Check manufacturer datasheets for equivalent PPTC devices with similar thermal characteristics and lead spacing compatibility.