RHEF050-2

Ptc Resettable Fuses Overview

The Littelfuse RHEF050-2 is a PolySwitch radial leaded PPTC resettable fuse designed for circuit protection. It features a 30 VDC maximum voltage rating and a 500 mA hold current. The device trips at approximately 900 mA to 1 A, with a maximum trip time of 2.5 seconds. It offers a high fault current rating of 40 A and operates within a temperature range of -40°C to +125°C. The component has a typical resistance of 1.1 ohms and utilizes a radial disk package.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection through automatic resistance increase during fault conditions
• Enables reusable circuit safeguarding by resetting automatically after cooling
• Supports through-hole mounting via radial leads for PCB integration

Ptc Resettable Fuses Applications

• Protection of automotive wiring harnesses and circuits
• Safeguarding telecom equipment from overcurrent events
• Overcurrent protection for power supply components

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation against official Littelfuse documentation to confirm exact electrical characteristics and package dimensions. Ensure the selected variant matches the required hold current and voltage ratings for the target application. Cross-reference datasheet parameters such as trip time and resistance values before procurement to guarantee compatibility with system design specifications.

Ptc Resettable Fuses Selection Notes

Select this component based on the required 30 VDC operating voltage and 500 mA continuous current capacity. Consider the thermal environment, as the device supports operation up to +125°C. Evaluate the physical space constraints for the radial disk package and verify that the 40 A maximum fault current rating exceeds potential short-circuit levels in the protected circuit.

Ptc Resettable Fuses Part Context

The RHEF050-2 belongs to the Littelfuse PolySwitch RHEF series of resettable fuses. This series provides solid-state overcurrent protection solutions suitable for various industrial and commercial applications. The radial leaded form factor allows for easy insertion into printed circuit boards, offering a robust alternative to traditional one-time fuses.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse RHEF series devices with matching 500 mA hold current and 30 VDC ratings. Verify pin spacing and dimensional tolerances when replacing with generic PPTC components to ensure mechanical fit.