RHEF050US-2

Ptc Resettable Fuses Overview

The Littelfuse RHEF050US-2 is a PolySwitch radial-leaded PTC resettable fuse designed for overcurrent protection. It features a maximum voltage of 30 VDC and a hold current of 500 mA, with a trip current of 920 mA. The device supports a maximum fault current of 40 A and exhibits an initial resistance minimum of 480 mOhms and a maximum post-trip resistance of 1.1 Ohms. Operating within a temperature range of -40°C to +125°C, it utilizes a disk package with radial leads spaced at 5.05 mm.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault conditions clear without manual replacement
• Constructed with cured flame retardant epoxy polymer meeting UL94 V-0 requirements
• Features tin-plated copper clad steel leads suitable for through-hole PCB mounting

Ptc Resettable Fuses Applications

• Indoor LED lighting circuit protection
• Portable electronic device power lines
• Peripheral interface circuits requiring overcurrent safeguarding

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix US-2 against official Littelfuse documentation to confirm compliance with regional safety standards and material composition requirements. Ensure that the selected variant matches the required lead spacing and package dimensions for the target PCB footprint. Cross-reference the datasheet revision date to confirm the electrical parameters align with current manufacturing specifications before finalizing procurement orders.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits requiring a compact, radial-leaded resettable fuse with a 30V rating. The 500mA hold current makes it suitable for low-power applications such as LED drivers or small signal interfaces. Consider the 40A maximum fault current capability to ensure adequate protection against short-circuit events while maintaining reliable tripping characteristics under normal operating temperatures.

Ptc Resettable Fuses Part Context

The RHEF050US-2 belongs to the Littelfuse RHEF series of PolySwitch devices, representing a comprehensive set of radial-leaded PPTC products. This series is engineered for high-volume electronics assembly and offers wide form factor options. The US-2 designation typically indicates specific regulatory certifications or material compositions tailored for particular market regions compared to standard variants.

Ptc Resettable Fuses Replacement Considerations

• RHEF050
• RHEF050-2

Ptc Resettable Fuses FAQ

What is the maximum fault current rating for the RHEF050US-2?

The device has a maximum fault current rating of 40 A.

Does the RHEF050US-2 require manual replacement after tripping?

No, it is a resettable fuse that automatically recovers once the fault condition is removed and the device cools down.