RUEF400-1

Ptc Resettable Fuses Overview

The Littelfuse RUEF400-1 is a PolySwitch resettable PPTC device designed for overcurrent protection. It features a 30 VDC maximum voltage and a 4 A hold current, with an 8 A trip current threshold. The component has a maximum resistance of 50 mOhms and can withstand a maximum current of 100 A. Operating within a temperature range of -40°C to +85°C, it utilizes radial leads with a 5.8 mm spacing. Physical dimensions include a length of 19.3 mm, width of 14 mm, and height of 3 mm, with a power dissipation rating of 2.68 W.

Ptc Resettable Fuses Feature Summary

• Provides resettable overcurrent protection using polymeric positive temperature coefficient technology.
• Designed for compatibility with high-volume electronics assembly processes.
• Constructed without lead or halogen content in compliance with RoHS standards.

Ptc Resettable Fuses Applications

• Overcurrent protection in portable electronic devices
• Protection circuits for peripheral equipment connections
• Battery pack safeguarding in consumer electronics

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation against official Littelfuse documentation to ensure correct package and termination specifications. Confirm that the selected variant matches the required hold and trip currents for the target circuit design. Cross-reference regulatory compliance certificates such as UL and CSA with the latest product datasheet to ensure adherence to current safety standards.

Ptc Resettable Fuses Selection Notes

Select this component based on its 4 A hold current and 30 VDC rating to match system operational limits. Ensure the PCB layout accommodates the radial lead spacing and physical footprint dimensions. Evaluate thermal management requirements considering the 2.68 W power dissipation capability and operating temperature range constraints.

Ptc Resettable Fuses Part Context

This part belongs to the RUEF series of PolySwitch resettable fuses from Littelfuse. The series offers various form factors and termination methods suitable for diverse electronic applications. These devices serve as single-use or resettable overcurrent protection solutions for modern electronics manufacturing.

Ptc Resettable Fuses Replacement Considerations

Consult official Littelfuse substitution guides for verified equivalent parts. Do not assume interchangeability with generic PTC devices due to specific electrical and mechanical tolerances.