RUE300

Ptc Resettable Fuses Overview

The Littelfuse RUE300 is a PolySwitch resettable PPTC fuse from the RUEF series, designed for overcurrent protection in circuits operating up to 30 VDC. It features a hold current of 3 A and a trip current of 6 A, with a maximum fault current rating of 100 A. The device exhibits a typical trip time of 10.8 seconds at trip current and maintains a resistance range between 20 mΩ minimum and 80 mΩ maximum. Rated for 2 W power dissipation, it operates within a temperature range of -40°C to +85°C. The component utilizes radial leads with a 5.8 mm spacing and measures 16.5 mm in length, 11.4 mm in width, and 3 mm in height.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by increasing resistance as heat builds during fault conditions
• Offers resettable functionality to restore circuit continuity after cooling following an overcurrent event
• Features a compact radial-leaded form factor suitable for PCB mounting in space-constrained designs

Ptc Resettable Fuses Applications

• Protection of automotive actuators, screens, and small motors
• Safeguarding telecom equipment and wiring harnesses from overcurrent events
• Overcurrent protection for battery-powered devices and rechargeable batteries

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix (e.g., U) against the manufacturer datasheet to confirm exact electrical tolerances and packaging details. Ensure the selected variant meets the required agency approvals such as UL, CSA, or TUV for the target market. Confirm lead pitch and physical dimensions match the PCB footprint requirements before finalizing procurement.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable solution is preferred over traditional fuses for circuits requiring 3 A continuous operation. Ensure the maximum voltage rating of 30 VDC aligns with the system's operational limits. Consider the thermal environment, as the trip characteristics are influenced by ambient temperature, and verify that the 100 A fault current rating exceeds potential short-circuit levels.

Ptc Resettable Fuses Part Context

The RUE300 belongs to the RUEF series of PolySwitch resettable fuses, which are engineered for robust circuit protection in demanding environments. This series is widely utilized in automotive, telecommunications, and industrial applications where reliable overcurrent protection and resettable functionality are critical for system uptime and safety.

Ptc Resettable Fuses Replacement Considerations

The RUEF300U is a documented equivalent part number within the same series, offering identical core electrical specifications. Verify package compatibility and agency certifications when substituting.