RUEF250-2

Ptc Resettable Fuses Overview

The Littelfuse RUEF250-2 is a PolySwitch radial leaded PPTC resettable fuse designed for PCB mounting. It features a 2.5 A hold current and a 4.9 A trip current, with a maximum voltage rating of 30 VDC. The device has a minimum resistance of 80 mOhms and a maximum resistance of 1 Ohm after tripping. It supports a maximum fault current of 100 A and dissipates up to 1.75 W. Operating temperatures range from -40°C to +85°C. Physical dimensions include a length of 16.3 mm, width of 8.1 mm, and height of 2.8 mm, with a lead spacing of 5.8 mm.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising internal resistance during fault conditions
• Radial leaded form factor enables direct through-hole PCB integration
• Resettable functionality allows circuit restoration without manual replacement

Ptc Resettable Fuses Applications

• Protection of circuits, wiring harnesses, and PCB components
• Telecom and networking equipment line protection
• Computer motherboards and peripheral ports

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation when ordering, as the RUEF series includes variants such as RUEF250U and RUEF250-2 which may differ in packaging or coating specifications. Confirm that the required 30 VDC rating and 100 A interrupting capacity align with the target application's electrical stress profiles before finalizing procurement.

Ptc Resettable Fuses Selection Notes

Select this component when a 2.5 A continuous current rating and 30 VDC system voltage are required. Ensure the PCB layout accommodates the 5.8 mm lead spacing and the specified body dimensions. Consider the thermal environment, as the device operates within a -40°C to +85°C range and requires adequate power dissipation capability for the expected fault currents.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse RUEF series of PolySwitch resettable fuses. These devices utilize positive temperature coefficient materials to provide solid-state overcurrent protection. The radial leaded construction distinguishes it from surface-mount alternatives like the SMD series, offering robust mechanical attachment for applications requiring durable through-hole connections.

Ptc Resettable Fuses Replacement Considerations

Publicly confirmed substitute part numbers for RUEF250-2 were not identified in the provided documentation.