RHEF650

Ptc Resettable Fuses Overview

The Littelfuse RHEF650 is a PolySwitch resettable PPTC device from the RXEF series, designed for overcurrent protection in automotive and industrial applications. It features radial leads for PCB mounting and operates within a temperature range of -40°C to +85°C. The component has a holding current of 650 mA and a trip current of 1.3 A, with a maximum voltage rating of 72 VDC. Its maximum fault current rating is 40 A, and it exhibits a cold resistance of 720 mOhms. The device measures 9.7 mm in diameter and 3 mm in length, dissipating up to 880 mW.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection through positive temperature coefficient (PPTC) technology that increases resistance during fault conditions.
• Features radial leaded construction suitable for direct printed circuit board mounting.
• Includes built-in strain relief to enhance mechanical durability in vibration-prone environments.

Ptc Resettable Fuses Applications

• Protection of automotive actuators and small motors
• Safeguarding battery packs from overcurrent and short circuits
• Overcurrent protection for wiring harnesses and PCB components

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix codes on the ordering information to confirm exact package variations or material compliance status. Ensure the selected variant matches the required voltage and current ratings for the target application. Confirm RoHS compliance details if restricted substances are a constraint. Cross-reference the manufacturer's latest datasheet for any updates to dimensional tolerances or testing standards before finalizing procurement specifications.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable fuse is required for low-voltage DC circuits operating up to 72 VDC. The 650 mA holding current makes it suitable for protecting sensitive loads that draw moderate steady-state currents. Consider the 720 mOhm resistance for potential power loss calculations in high-current paths. Verify that the 40 A maximum fault current rating exceeds the prospective short-circuit current at the installation point to ensure safe operation without catastrophic failure.

Ptc Resettable Fuses Part Context

The RHEF650 belongs to the RXEF series of PolySwitch resettable fuses manufactured by Littelfuse. This series is engineered specifically for robust performance in automotive and industrial sectors where space constraints and reliability are critical. The radial lead form factor distinguishes it from surface-mount alternatives, offering easier integration into through-hole designs for harness and battery protection applications.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other RXEF series devices with matching electrical parameters, such as the RXEF065S. When replacing, verify that the new part maintains the same voltage rating, holding current, and physical dimensions to ensure compatibility with existing PCB footprints and thermal management requirements.