RXEF040-1

Ptc Resettable Fuses Overview

The Littelfuse RXEF040-1 is a PolySwitch radial-leaded PPTC resettable fuse designed for circuit protection. It features a hold current of 400 mA and a trip current of 800 mA, with a maximum voltage rating of 72 VDC. The device has a maximum fault current rating of 40 A and an initial resistance of 1.29 ohms. It operates within a temperature range of -40°C to +85°C and utilizes a radial leaded package with a 5.8 mm lead spacing.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection through automatic resistance increase during fault conditions
• Offers resettable functionality to restore circuit continuity after cooling
• Compatible with high-volume electronics assembly processes

Ptc Resettable Fuses Applications

• Satellite video receivers
• Industrial controls
• Computer motherboards
• USB hubs, ports and peripherals

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact electrical parameters and packaging configuration. Ensure the selected variant matches the required hold current and voltage ratings for the target application circuit design.

Ptc Resettable Fuses Selection Notes

Select this component based on the 400 mA hold current requirement and 72 VDC maximum voltage constraint. Confirm that the radial leaded form factor aligns with the PCB layout and that the thermal environment remains within the specified operating temperature limits.

Ptc Resettable Fuses Part Context

This part belongs to the RXEF series of PolySwitch resettable fuses from Littelfuse. The series provides low hold currents down to 50 mA and high voltage ratings up to 72 V in a radial-leaded format suitable for through-hole mounting.

Ptc Resettable Fuses Replacement Considerations

Consult official Littelfuse substitution guides for verified cross-reference part numbers. Do not assume functional equivalence with generic PTC devices without verifying electrical parameter alignment.