RXEF020S

Ptc Resettable Fuses Overview

The Littelfuse RXEF020S is a PolySwitch radial-leaded PTC resettable fuse designed for circuit protection. It features a hold current of 200 mA and a trip current of 400 mA, operating at a maximum voltage of 72 VDC. The device has a resistance of 1.83 Ohms and a power dissipation rating of 410 mW. It withstands fault currents up to 40 A with a typical trip time of 2.2 seconds. Physical dimensions include a diameter of 7.4 mm and a length of 3 mm, with a lead spacing of 5.8 mm. It operates within a temperature range of -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides automatic overcurrent protection through self-resetting polymeric positive temperature coefficient technology.
• Features radial leads for reliable through-hole PCB mounting applications.
• Offers high fault current capacity to handle significant surge events without permanent damage.

Ptc Resettable Fuses Applications

• Overcurrent protection in portable electronic devices
• Circuit safeguarding in automotive electronics
• Protection for telecommunications equipment interfaces

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation against official Littelfuse documentation to confirm exact electrical tolerances and packaging configurations. Ensure that the selected variant matches the required thermal characteristics and physical footprint for the target PCB layout. Cross-reference the datasheet for any recent changes in agency approvals or material composition before finalizing procurement specifications.

Ptc Resettable Fuses Selection Notes

Select this component based on the 200 mA hold current requirement and 72 VDC maximum voltage constraint. Evaluate the 1.83 Ohm initial resistance to ensure it does not exceed allowable voltage drop limits in the signal path. Confirm that the 40 A interrupt rating aligns with the available short-circuit current levels in the protected circuit to prevent catastrophic failure during fault conditions.

Ptc Resettable Fuses Part Context

This part belongs to the RXEF series of PolySwitch resettable fuses from Littelfuse. The series provides a comprehensive range of radial-leaded PPTC devices for various voltage and current ratings. These components are designed to replace traditional fusible links in applications requiring repeated overcurrent protection without manual replacement.

Ptc Resettable Fuses Replacement Considerations

Direct replacements include the RXEF020-AP and RXEF020 variants within the same family. Verify that substitute parts maintain identical hold current, trip current, and voltage ratings to ensure circuit compatibility. Check for differences in package tolerance or lead configuration if space constraints are critical.