TRF250-110U

Ptc Resettable Fuses Overview

The Littelfuse TRF250-110U is a PolySwitch resettable PTC fuse from the TRF250 series, designed for PCB mounting with radial termination. It features a hold current of 110 mA and a trip current of 220 mA, supporting a maximum voltage of 60 VDC and a maximum rated current of 3 A. The device exhibits an initial resistance of 14 Ohms minimum and a post-trip resistance of 28 Ohms maximum. Operating within a temperature range of -40°C to +85°C, it utilizes a radial, disc-style package with a 5 mm lead spacing.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit protection through self-resetting polymer PTC technology
• Offers dual certification from UL and CSA agencies for safety compliance
• Designed for surface or through-hole PCB integration via radial leads

Ptc Resettable Fuses Applications

• Overcurrent protection in consumer electronics assemblies
• Circuit safeguarding in building and home automation systems
• Protection for peripheral interfaces and data ports

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation against the manufacturer datasheet to confirm packaging configuration, as variations exist within the TRF250 family. Ensure that the selected variant meets the required thermal derating curves for the intended operating environment. Cross-reference agency approval marks such as UL and CSA if regulatory compliance is mandatory for the final equipment design.

Ptc Resettable Fuses Selection Notes

Select this component based on the 110 mA hold current requirement and the 60 VDC maximum voltage constraint. Evaluate the thermal dissipation needs relative to the ambient temperature conditions, as PTC performance is temperature-dependent. Confirm that the physical dimensions and lead spacing are compatible with the printed circuit board layout constraints.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse PolySwitch TRF250 series of resettable fuses. These devices serve as reusable alternatives to traditional one-time fuses, offering protection against overcurrent conditions without requiring manual replacement after a fault event occurs.

Ptc Resettable Fuses Replacement Considerations

Equivalent parts include TRF250-110T-RA-B-0.5 and RF0126-000.