RXE300

Ptc Resettable Fuses Overview

The RXE300 is a radial lead PolySwitch resettable fuse from the Littelfuse 398 series, designed for overcurrent protection in electronic circuits. It features a hold current of 3A and a trip current of 6A, with a maximum voltage rating of 72V DC. The device handles a maximum fault current (Imax) of 40A and dissipates 2.8W at rated conditions. Key electrical parameters include a minimum resistance of 0.04Ω and a typical time-to-trip of 19.8 seconds under trip current. The component has a diameter of 23.9 mm and operates within a temperature range of -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Offers reliable overcurrent protection through positive temperature coefficient characteristics
• Features radial lead construction for through-hole PCB mounting applications

Ptc Resettable Fuses Applications

• Portable electronics battery pack protection
• Consumer appliance power supply circuits
• Telecommunications equipment input filtering

Ptc Resettable Fuses Procurement Notes

Verify component status carefully as the RXE300 is classified as obsolete and no longer manufactured by Littelfuse. Sourcing should focus on authorized distributors holding remaining stock or approved direct substitutes like the RXEF300. Confirm that any available units match original datasheet specifications regarding hold current, voltage ratings, and package dimensions to ensure compatibility with existing designs.

Ptc Resettable Fuses Selection Notes

Select this component only if legacy design compatibility is required or for prototyping purposes given its obsolete status. Ensure the application current does not exceed the 3A hold rating and voltage stays below 72V. Consider thermal derating requirements based on ambient operating temperatures up to 85°C. Evaluate alternative active parts if long-term supply stability is critical for production volumes.

Ptc Resettable Fuses Part Context

The RXE300 belongs to the Littelfuse 398 Series of radial lead PPTC devices. This series is engineered for general-purpose circuit protection in low-voltage applications. The component utilizes polymer technology to provide bidirectional protection against overcurrent conditions. It serves as a reusable alternative to traditional fuses in space-constrained electronic assemblies.

Ptc Resettable Fuses Replacement Considerations

The RXEF300 is identified as a direct substitute part number for the obsolete RXE300. Verify that the RXEF300 meets all original electrical requirements including the 3A hold current and 72V rating before implementation.