RXEF020S-2

Ptc Resettable Fuses Overview

The Littelfuse RXEF020S-2 is a PolySwitch radial lead PTC resettable fuse designed for overcurrent protection. It features a hold current of 200 mA and a trip current of 400 mA, operating at a maximum voltage of 72 V. The device has a maximum interrupting rating of 40 A and a nominal resistance of 1.83 Ohms. It operates within a temperature range of -40°C to +85°C. Physical dimensions are approximately 11.7 mm in diameter and 3 mm in length, with a 7.4 mm lead spacing. Power dissipation is rated at 0.41 W.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising resistance as it heats to limit current flow
• Resettable functionality allows circuit recovery after fault conditions without replacement
• Radial leaded construction facilitates through-hole PCB mounting

Ptc Resettable Fuses Applications

• Automotive electronics circuits
• Telecommunications equipment
• Power supply units

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation against official Littelfuse documentation to confirm exact electrical characteristics and packaging configuration. Ensure the selected component matches the required hold and trip currents for the target application circuit. Confirm compliance with relevant safety certifications such as UL or TUV if required for the end product.

Ptc Resettable Fuses Selection Notes

Select this component based on the 200 mA hold current requirement and 72 V maximum voltage rating. Consider the 1.83 Ohm initial resistance for voltage drop calculations. Verify that the radial lead spacing fits the printed circuit board layout. Ensure the operating temperature range meets the environmental conditions of the installation site.

Ptc Resettable Fuses Part Context

The RXEF series represents Littelfuse's PolySwitch line of polymeric positive temperature coefficient devices. These solid-state fuses offer a reusable alternative to traditional single-use fusible links. The series provides various form factors including surface mount and radial lead options to suit different assembly requirements.

Ptc Resettable Fuses Replacement Considerations

Consult Littelfuse official substitution guides for verified equivalent part numbers. Generic replacements may not match the precise trip characteristics or physical dimensions. Verify that any substitute maintains the same voltage and current ratings for safe operation.