TR250-080U

Ptc Resettable Fuses Overview

The Littelfuse TR250-080U is a polymeric PTC resettable fuse designed for overcurrent protection. It features a maximum operating voltage of 250V (60V internal) and a hold current (Ih) of 80 mA. The trip current (It) is specified at 160 mA, with a maximum fault current rating of 3 A. Initial resistance (Ri) is typically 14 Ohms minimum, while post-trip resistance (R1) has a maximum of 33 Ohms. The device operates within a temperature range of -40°C to +85°C and utilizes a radial, disc-style through-hole package.

Ptc Resettable Fuses Feature Summary

• Polymeric construction for reliable self-resetting functionality after fault clearance
• Through-hole radial mounting configuration suitable for standard PCB layouts
• Certified by cURus and TUV agencies for international safety compliance

Ptc Resettable Fuses Applications

• Telecommunications equipment line protection
• Networking devices circuit safeguarding
• Consumer electronics power input protection

Ptc Resettable Fuses Procurement Notes

Verify the obsolete status of the TR250-080U before procurement planning. Confirm availability of direct substitutes such as the TRF250-080U if production continuity is required. Ensure that the replacement component matches the original electrical specifications and physical footprint to maintain design integrity without requiring board modifications.

Ptc Resettable Fuses Selection Notes

Select this component for applications requiring robust overcurrent protection in telecommunications or networking environments. The high voltage rating of 250V makes it suitable for mains-connected circuits where lower voltage fuses would be insufficient. Consider the thermal derating characteristics when designing for high ambient temperatures near the upper limit of the operating range.

Ptc Resettable Fuses Part Context

This part belongs to the PolySwitch® series of resettable fuses from Littelfuse Inc. These components are engineered to provide automatic recovery from overcurrent conditions, eliminating the need for manual fuse replacement. The series is widely recognized for its reliability in protecting sensitive electronic circuits against transient and sustained overcurrent events.

Ptc Resettable Fuses Replacement Considerations

The TRF250-080U is listed as a direct substitute. Verify that the TRF variant maintains identical electrical parameters and mechanical dimensions to ensure seamless integration into existing designs without re-validation of the enclosure or PCB layout.