RKEF135

Ptc Resettable Fuses Overview

The Littelfuse RKEF135 is a polymeric PTC resettable fuse from the RKEF series, designed for through-hole PCB mounting. It features radial leads with a 5.8 mm spacing and a disc package. Key electrical parameters include a hold current of 1.35 A, trip current of 2.7 A, and maximum voltage rating of 60 VDC. The device supports a maximum fault current of 40 A and has an initial resistance of approximately 230 mOhms. It operates within a temperature range of -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Polymeric positive temperature coefficient (PTC) technology provides automatic circuit protection that resets after fault clearance.
• Radial leaded construction facilitates standard through-hole printed circuit board assembly.
• Certified by major safety agencies including UL, CSA, TUV, and CQC for global compliance.

Ptc Resettable Fuses Applications

• Overcurrent protection in portable electronic devices
• Protection circuits for battery-powered equipment
• Interface protection in consumer electronics

Ptc Resettable Fuses Procurement Notes

Verify the specific datasheet revision and certification marks required for your target market before ordering. Confirm that the radial lead spacing and physical dimensions match your PCB footprint requirements. Ensure the 60VDC voltage rating and 1.35A hold current are sufficient for the application's operating conditions. Check for any specific packaging preferences such as bulk or tape-and-reel availability if applicable.

Ptc Resettable Fuses Selection Notes

Select this component when a 1.35A hold current and 60VDC rating are required for overcurrent protection. Compare against the RXEF series if higher voltage ratings are needed, or the RUEF series for higher current capabilities. Consider the 40A maximum fault current capability to ensure adequate protection during short-circuit events. Verify thermal management requirements given the self-heating nature of PTC devices.

Ptc Resettable Fuses Part Context

The RKEF135 belongs to Littelfuse's RKEF family of resettable fuses, which are engineered for high-reliability applications requiring repeated fault recovery. This series utilizes advanced polymeric materials to achieve fast response times while maintaining low resistance during normal operation. It serves as a reusable alternative to traditional one-time fusible links in modern electronic designs.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes within the same series include other RKEF part numbers with adjusted current ratings. Cross-series alternatives may include the RXEF series for higher voltage applications or the RUEF series for higher current handling. Always verify electrical parameters and physical dimensions before substituting.

Ptc Resettable Fuses FAQ

What is the trip current for the RKEF135?

The trip current is 2.7 A, which is double the 1.35 A hold current.

Is the RKEF135 RoHS compliant?

Yes, the component is RoHS compliant according to manufacturer specifications.