RXEF300-2

Ptc Resettable Fuses Overview

The Littelfuse RXEF300-2 is a PolySwitch radial-leaded PPTC resettable fuse designed for PCB mounting. It features a 3 A hold current and a 6 A trip current, with a maximum voltage rating of 72 VDC. The device has a maximum interrupting rating 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 lead form factor with a 10.15 mm lead spacing. The component measures 23.11 mm in diameter and 3.00 mm in height, offering reliable overcurrent protection for electronic circuits.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit reset after fault clearance without manual replacement
• Increases internal resistance upon overheating to limit excessive current flow
• Compatible with high-volume electronics assembly processes

Ptc Resettable Fuses Applications

• Computer motherboards
• USB hubs, ports and peripherals
• Industrial controls

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation during procurement to ensure correct packaging configuration. Confirm that the required voltage and current ratings align with the target circuit design parameters. Check for RoHS compliance status if environmental regulations apply to the manufacturing process. Ensure the radial lead spacing matches the printed circuit board layout requirements before finalizing the order.

Ptc Resettable Fuses Selection Notes

Select this component when a 72 VDC maximum voltage rating and 3 A continuous hold current are required. Consider the 40 A interrupting capacity for potential fault scenarios. Evaluate the thermal environment to ensure operation remains within the specified -40°C to +85°C range. Compare physical dimensions against available board space constraints prior to integration into the design.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse RXEF series of PolySwitch resettable fuses. The series offers low hold currents and high voltage ratings up to 72 V. These devices represent a comprehensive set of PPTC products featuring various form factors and termination methods suitable for diverse electronic applications.

Ptc Resettable Fuses Replacement Considerations

RXEF300K-2