RXEF065

Ptc Resettable Fuses Overview

The Littelfuse RXEF065 is a PolySwitch radial leaded PPTC resettable fuse designed for overcurrent protection. It features a hold current of 650 mA and a trip current of 1.3 A, with a maximum voltage rating of 72 VDC. The device has a maximum fault current rating of 40 A and an initial resistance of 310 mOhms minimum. It operates within a temperature range of -40°C to +85°C and dissipates up to 880 mW. Physical dimensions include a 9.7 mm diameter and 3 mm length.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising resistance as it heats to limit current flow during fault conditions.
• Offers automatic reset functionality after the fault condition is removed and the device cools down.
• Features a compact radial leaded package suitable for through-hole PCB mounting.

Ptc Resettable Fuses Applications

• Protection of circuits, wiring harnesses, and PCB components in electronic systems.
• Overcurrent protection for battery-powered devices and rechargeable batteries.
• Circuit protection in telecommunications and networking equipment.

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix (e.g., AP) when ordering, as packaging options like cut tape or tape-and-reel may differ from standard bulk configurations. Confirm RoHS compliance status and agency approvals such as UL, CSA, and TUV are required for your target market. Ensure the selected variant matches the necessary thermal and electrical ratings for the application environment.

Ptc Resettable Fuses Selection Notes

Select this component based on the 650 mA hold current and 72 VDC maximum voltage requirements. Consider the 40 A interrupting rating for potential short-circuit scenarios. Evaluate the thermal environment to ensure operation remains within the -40°C to +85°C range. Compare the 310 mOhms minimum resistance against circuit sensitivity needs to minimize power loss during normal operation.

Ptc Resettable Fuses Part Context

The RXEF065 belongs to the Littelfuse RXEF series of PolySwitch resettable fuses. This series is part of the broader portfolio of polymer PTC devices designed for robust circuit protection. The radial leaded form factor distinguishes it from surface-mount alternatives, offering flexibility for various PCB layout styles and assembly processes.

Ptc Resettable Fuses Replacement Considerations

RXEF065-AP

Ptc Resettable Fuses FAQ

What is the difference between hold current and trip current for this device?

Hold current (650 mA) is the maximum current the device will allow without tripping under normal conditions. Trip current (1.3 A) is the minimum current that will cause the device to switch to a high-resistance state to protect the circuit.

How does the RXEF065 recover after a fault?

Once the fault condition is removed and the device cools down, its internal polymer structure returns to its low-resistance state, automatically resetting the fuse without manual intervention.