TRF250-120US

Ptc Resettable Fuses Overview

The Littelfuse TRF250-120US is a PolySwitch resettable PTC fuse designed for overcurrent protection. It features a maximum voltage rating of 60 VDC and a hold current of 120 mA, with a trip current of 240 mA. The device supports a maximum fault current of 3 A and exhibits an initial resistance of 10 ohms maximum. It operates within a temperature range of -40°C to +85°C and utilizes a radial leaded package with a 5 mm lead spacing.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault conditions clear without manual replacement
• Increases resistance significantly upon overheating to limit excessive current flow
• Offers reliable protection against overcurrent events in sensitive electronic circuits

Ptc Resettable Fuses Applications

• Protection of wiring harnesses and PCB components
• Overcurrent protection for automotive secondary circuits
• Telecom and networking equipment line protection

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'US' against official Littelfuse documentation to confirm it denotes the correct tape-and-reel packaging variant distinct from bulk or cut-tape options. Ensure the requested quantity aligns with standard reel sizes specified in the manufacturer's ordering guide. Cross-reference the RoHS compliance status and agency approvals such as UL, CSA, and TUV required for your target market regulations before finalizing procurement.

Ptc Resettable Fuses Selection Notes

Select this component when a 60 VDC maximum voltage rating and 120 mA hold current are required for radial leaded applications. Ensure the expected operating current remains below 120 mA to prevent nuisance tripping during normal operation. Verify that the ambient temperature environment stays within the -40°C to +85°C operational range. Confirm that the physical dimensions and 5 mm lead spacing fit the available PCB footprint constraints.

Ptc Resettable Fuses Part Context

This part belongs to the TRF250 series of PolySwitch resettable fuses, which are polymer positive temperature coefficient devices. The series is engineered for compact circuit protection in automotive, telecom, and general industrial applications. These devices serve as reusable alternatives to traditional one-time fuses, offering cost-effective long-term protection strategies for low-current DC circuits.

Ptc Resettable Fuses Replacement Considerations

TRF250-120U-2

Ptc Resettable Fuses FAQ

What is the maximum fault current rating for this device?

The TRF250-120US has a maximum fault current rating of 3 A.

Does this component require manual resetting after a trip event?

No, it is a self-resetting device that returns to its low-resistance state once the fault condition is removed and the component cools down.