RUEF300U-2

Ptc Resettable Fuses Overview

The Littelfuse RUEF300U-2 is a PolySwitch radial-leaded PPTC resettable fuse designed for overcurrent protection. It features a maximum voltage rating of 30 VDC and a hold current (Ih) of 3 A. The trip current (It) is specified at 6 A, with a maximum fault current rating of 100 A. Initial resistance (Rmin) is 20 mOhms, while maximum resistance after tripping (Rmax) is 80 mOhms. The device operates within a temperature range of -40°C to +85°C and has a power dissipation of 2 W. Dimensions are 11.4 mm in width, 3.0 mm in height, and 16.5 mm in length.

Ptc Resettable Fuses Feature Summary

• Provides resettable overcurrent protection by increasing resistance as it heats during fault conditions.
• Radial leaded form factor suitable for through-hole PCB mounting applications.
• Certified by UL, CSA, TUV, and CQC agencies for global compliance.

Ptc Resettable Fuses Applications

• Protection for circuits, wiring harnesses, and PCB components.
• Overcurrent protection in automotive actuators, screens, and small motors.
• Power supply and telecom equipment circuit safeguarding.

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'U' against the official Littelfuse datasheet to confirm package type and certification status. Ensure the selected variant matches the required 30V DC rating and 3A hold current specifications for the target application. Cross-reference agency approvals such as UL or CSA if specific regional compliance is mandatory for the end product.

Ptc Resettable Fuses Selection Notes

Select this component when a 30V DC system requires a 3A continuous hold current with a 6A trip threshold. The radial leaded package is appropriate for through-hole assembly where space allows for 16.5mm length. Consider the 80mOhms maximum resistance impact on circuit efficiency. Verify that the operating temperature range of -40°C to +85°C aligns with the environmental conditions of the installation site.

Ptc Resettable Fuses Part Context

The RUEF series represents a comprehensive set of PolySwitch radial-leaded PTC devices from Littelfuse. These components balance voltage ratings up to 30V with hold currents up to 9A. The RUEF300U-2 belongs to this family, offering reliable solid-state protection against overcurrent events without permanent damage, distinguishing it from single-use fuses.

Ptc Resettable Fuses Replacement Considerations

Consult the Littelfuse selection guide for direct substitutes within the RUEF series. Verify equivalent electrical parameters including 3A hold current, 30V rating, and radial leaded configuration before substitution.

Ptc Resettable Fuses FAQ

What is the maximum fault current rating for the RUEF300U-2?

The maximum fault current rating is 100 A.

Does the RUEF300U-2 support surface mount installation?

No, the RUEF300U-2 is a radial leaded device intended for through-hole PCB mounting.