RKEF400

Ptc Resettable Fuses Overview

The Littelfuse RKEF400 is a radial-leaded PolySwitch resettable PPTC fuse from the RKEF series. It features a 60V maximum voltage rating and a 4A hold current with an 8A trip current. The device trips within 24 seconds at the trip current and has a maximum resistance of 60mΩ. It operates between -40°C and +60°C, dissipates up to 3.7W, and carries UL, RoHS, TUV, and CSA certifications.

Ptc Resettable Fuses Feature Summary

• Provides automatic overcurrent protection by increasing resistance during fault conditions
• Offers reliable circuit safeguarding for wiring harnesses and PCB components
• Supports multiple international safety agency approvals including UL and TUV

Ptc Resettable Fuses Applications

• Protection of circuits and wiring harnesses
• PCB component overcurrent safeguarding
• General industrial circuit protection

Ptc Resettable Fuses Procurement Notes

Verify the specific part number RKEF400 against official Littelfuse documentation to confirm exact electrical ratings and package dimensions. Ensure compatibility with system voltage and thermal requirements before procurement. Check for updated certification status and environmental compliance data directly from the manufacturer's datasheet.

Ptc Resettable Fuses Selection Notes

Select this component based on its 60V rating and 4A hold current suitability for specific circuit loads. Consider the radial lead form factor for through-hole mounting requirements. Evaluate the operating temperature range and power dissipation capabilities against the intended application environment to ensure reliable performance.

Ptc Resettable Fuses Part Context

This device belongs to the Littelfuse RKEF series of PolySwitch resettable fuses. These radial-leaded PPTC devices are designed for robust overcurrent protection in various electronic applications. The series provides a solid-state alternative to traditional fusible links, offering reusable circuit protection capabilities.

Ptc Resettable Fuses Replacement Considerations

Consult official Littelfuse substitution guides for verified equivalent parts. Cross-reference hold current, trip current, and voltage ratings when identifying alternatives. Do not assume functional interchangeability without verifying technical specifications against the original component datasheet.