RGEF400-AP

Ptc Resettable Fuses Overview

The Littelfuse RGEF400-AP is a radial leaded resettable polymer positive temperature coefficient (PPTC) device designed for overcurrent protection. It features a holding current of 4.0 A and a trip current of 6.8 A. The component supports a maximum voltage rating of 16 V DC. Its construction utilizes a polymer composite that increases resistance significantly upon overheating, providing automatic circuit interruption during fault conditions without requiring manual replacement.

Ptc Resettable Fuses Feature Summary

• Provides automatic resettable overcurrent protection through thermal activation
• Eliminates the need for fuse replacement after fault clearance
• Offers reliable performance in compact electronic assemblies

Ptc Resettable Fuses Applications

• Secondary circuit protection in automotive electronics
• Overcurrent safeguarding for portable battery-powered devices
• Protection of communication interface ports and data lines

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation against official Littelfuse documentation to confirm material composition and compliance status. Ensure the selected variant matches the required voltage and current ratings for the target application circuit. Cross-reference agency approvals such as UL or CSA if regulatory certification is mandatory for the end product deployment.

Ptc Resettable Fuses Selection Notes

Select this component based on the circuit's normal operating current being below the holding current threshold. Ensure the maximum fault current does not exceed the device's interrupting capability. Consider the ambient temperature range, as higher temperatures may reduce the effective holding current. Validate that the package size fits within the available PCB real estate constraints.

Ptc Resettable Fuses Part Context

This part belongs to the RGEF series of radial leaded PPTC devices from Littelfuse. These components are engineered for applications requiring robust, reusable circuit protection. The series is commonly utilized in industries where maintenance access is difficult or where frequent fault events might occur, ensuring continuous system availability without hardware replacement.

Ptc Resettable Fuses Replacement Considerations

Consult official Littelfuse substitution guides for verified equivalents. Generic replacements must match the electrical characteristics and physical dimensions precisely. Do not assume interchangeability with other series without verifying technical specifications.