RXEF300K-2

Ptc Resettable Fuses Overview

The Littelfuse RXEF300K-2 is a PolySwitch resettable PTC fuse designed for overcurrent protection in radial lead through-hole PCB applications. It features a maximum holding current of 3 A and a trip current of 6 A, with a maximum voltage rating of 72 V. The device has a maximum fault current (Imax) of 40 A and an initial resistance of 40 mOhms. Operating within a temperature range of -40°C to +85°C, it utilizes a radial disc package measuring 23.11 mm in diameter and 3.00 mm in height.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault conditions clear without manual replacement
• Offers high fault current interruption capability up to 40 A
• Features low initial resistance for minimal power loss during normal operation

Ptc Resettable Fuses Applications

• Overcurrent protection for portable electronic devices
• Circuit safeguarding in telecommunications equipment
• Protection for battery packs and power supply modules

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation to confirm packaging format, as standard bulk and tape-and-reel variants exist within the same electrical specification family. Ensure that the procurement order explicitly matches the required reel quantity or bulk packaging type to align with automated assembly processes or manual insertion requirements.

Ptc Resettable Fuses Selection Notes

Select this component when a 3 A continuous current rating and 72 V maximum voltage are required for radial mounting. Confirm that the application's expected fault currents remain below the 40 A Imax limit. Verify that the operating environment stays within the specified -40°C to +85°C range to ensure reliable tripping characteristics.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse RXEF series of PolySwitch resettable fuses. These components utilize polymer positive temperature coefficient technology to provide reusable overcurrent protection. The series is widely utilized in consumer electronics and industrial controls where space constraints and cost-effectiveness are critical design factors.

Ptc Resettable Fuses Replacement Considerations

RXEF300K is the bulk-packaged equivalent with identical electrical specifications. RGEF300K-2 shares the 3 A holding current but operates at a lower 16 V maximum voltage rating.