RHEF550

Ptc Resettable Fuses Overview

The RHEF550 is a PolySwitch radial leaded resettable PTC fuse manufactured by Littelfuse. It features a maximum voltage rating of 16 VDC and a hold current of 5.5 A. The trip current is specified at 7.8 A, with a maximum interrupting rating of 100 A. The device exhibits a typical resistance of 54 mΩ. It operates within a temperature range of -40°C to +125°C. Physical dimensions include a height of 3 mm and a lead spacing of 5.8 mm.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit protection through resettable overcurrent interruption capabilities.
• Utilizes polymeric technology for reliable performance in high-volume electronics assembly.
• Designed for PCB mounting with radial lead termination for standard integration.

Ptc Resettable Fuses Applications

• Overcurrent protection for portable electronic devices
• Protection circuits in battery-powered equipment
• Interface protection for peripheral connections

Ptc Resettable Fuses Procurement Notes

Verify the specific datasheet revision and electrical tolerances against the latest Littelfuse documentation before finalizing designs. Confirm that the 16VDC maximum voltage and 5.5A hold current align with the target circuit requirements. Ensure thermal management considerations account for the operating temperature range limits during sustained operation.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable solution is required for low-voltage DC circuits up to 16V. The 5.5A hold current suits moderate load applications. Compare the 54mΩ resistance impact on power loss against alternatives. Verify that the radial lead form factor fits the available PCB footprint and assembly constraints.

Ptc Resettable Fuses Part Context

The RHEF550 belongs to the RHEF series of PolySwitch resettable fuses from Littelfuse. This series offers various hold currents and package options. The RHEF550 specifically targets applications requiring 5.5A protection in compact radial packages. It serves as a reusable alternative to traditional one-time fuses in consumer and industrial electronics.

Ptc Resettable Fuses Replacement Considerations

Cross-reference with other RHEF series parts for different current ratings. Check equivalent offerings from other manufacturers ensuring identical 16VDC and 5.5A specifications. Verify mechanical dimensions match existing board layouts if substituting.

Ptc Resettable Fuses FAQ

What is the maximum interrupting current for the RHEF550?

The maximum interrupting current rating is 100 A.

Does the RHEF550 support AC voltage applications?

The datasheet specifies a maximum voltage rating of 16 VDC; AC application suitability requires verification against specific AC voltage ratings in official documentation.