RKEF500K-2

Ptc Resettable Fuses Overview

The Littelfuse RKEF500K-2 is a PolySwitch resettable PTC device designed for overcurrent protection in electronic circuits. It features a radial, disc package suitable for PCB mounting with a lead spacing of 10.9 mm. The component maintains a hold current (Ih) of 5 A and trips at a current (It) of 10 A. It supports a maximum voltage of 60 VDC and has a maximum rated current of 40 A. The initial resistance is typically 50 mΩ, with a power dissipation of 3.23 W. Operating temperatures range from -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides automatic resettable overcurrent protection using polymeric PTC technology
• Features a radial disc package for through-hole PCB mounting
• Designed for compatibility with high-volume electronics manufacturing processes

Ptc Resettable Fuses Applications

• Overcurrent protection in portable consumer electronics
• Circuit protection for battery-powered devices
• Protection interfaces in automotive electronics systems

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'K-2' against official Littelfuse documentation to confirm the exact voltage rating and physical dimensions. Ensure that the procurement channel provides valid RoHS compliance certificates. Cross-reference the datasheet revision date to ensure the technical parameters match the current production batch specifications before finalizing orders.

Ptc Resettable Fuses Selection Notes

Select this component when a 5 A hold current and 60 VDC maximum voltage are required for radial mounting applications. Consider the 10.9 mm lead spacing for PCB layout constraints. Evaluate the thermal environment to ensure operation within the -40°C to +85°C range. Compare the trip time characteristics against circuit sensitivity requirements to ensure adequate protection speed without nuisance tripping during normal transient conditions.

Ptc Resettable Fuses Part Context

The RKEF500K-2 belongs to the Littelfuse RKEF series of PolySwitch resettable fuses. This series offers a wide range of form factors and termination methods. The components are engineered for reliability in high-volume electronics assembly. The radial disc design facilitates automated placement and standard through-hole soldering processes commonly used in industrial and consumer hardware manufacturing.

Ptc Resettable Fuses Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify electrical compatibility including hold current, trip current, and voltage ratings if considering alternative manufacturers. Ensure mechanical fitment matches the radial disc package and lead spacing specifications.