RXEF300-1

Ptc Resettable Fuses Overview

The Littelfuse RXEF300-1 is a radial leaded PolySwitch resettable fuse from the RXEF series, designed for overcurrent protection in electronic circuits. 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 fault current (Imax) rating of 40 A and a typical resistance of 100 mΩ. It operates within a temperature range of -40°C to +85°C and is housed in a bulk package.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Offers high fault current interruption capability up to 40 A
• Compatible with standard PCB mounting processes for high-volume assembly

Ptc Resettable Fuses Applications

• Computer motherboards and peripheral interfaces
• USB hubs, ports, and related peripherals
• Industrial control systems and transformers
• Satellite video receivers and modems

Ptc Resettable Fuses Procurement Notes

Verify that the specific suffix '-1' aligns with the required packaging or tape-and-reel configuration if automated assembly is intended, as standard RXEF parts are often supplied in bulk. Confirm RoHS compliance status and agency approvals such as UL, CSA, and TUV for the specific batch. Ensure the procurement documentation matches the exact part number to avoid confusion with similar RXEF variants.

Ptc Resettable Fuses Selection Notes

Select this component when a 3 A continuous current and 72 VDC rating are required for radial leaded applications. Consider the 100 mΩ resistance for power loss calculations and the 40 A Imax rating for short-circuit robustness. Evaluate the -40°C to +85°C operating range against environmental conditions. Compare against other RXEF models if lower hold currents or different voltage ratings are needed.

Ptc Resettable Fuses Part Context

The RXEF series represents a comprehensive line of radial leaded PPTC devices from Littelfuse, offering low hold currents down to 50 mA and high voltage ratings up to 72 V. This series is recognized for its compatibility with high-volume electronics assembly and includes various form factors. The RXEF300-1 fits within this lineup as a standard radial leaded solution for general circuit protection.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse RXEF series parts with identical 3 A hold and 72 VDC ratings, such as the RXEF300. Verify that alternative manufacturers' radial PPTCs match the 40 A Imax and 100 mΩ resistance specifications to ensure equivalent performance in the target application.