250R120-R3U

Ptc Resettable Fuses Overview

The Littelfuse 250R120-R3U is a PolySwitch resettable PTC device from the 250R series, designed for radial leaded PCB mounting. It features a holding current of 120 mA and a trip current of 240 mA. The component supports a maximum voltage rating of 60 VDC and 250 VRMS, with a maximum fault current rating of 3 A. Its initial resistance is 16 Ohms, and it operates within a temperature range of -40°C to +85°C. The device provides overcurrent protection by increasing resistance upon heating during fault conditions.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection for circuits and wiring harnesses through solid-state PTC technology.
• Features fast time-to-trip characteristics suitable for protecting access equipment and LAN/WAN infrastructure.
• Designed to withstand short-duration high-voltage fault currents while maintaining circuit integrity.

Ptc Resettable Fuses Applications

• Protection for local area network (LAN) and wide area network (WAN) equipment
• Overcurrent protection for access equipment and telecommunications hardware
• Circuit protection in general electronic devices requiring radial leaded resettable fuses

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix R3U against official Littelfuse documentation to confirm tape-and-reel packaging specifications, as standard TRF250-120 variants may differ in bulk packaging. Ensure compatibility with automated assembly processes if reel format is required. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability and compliance with RoHS directives.

Ptc Resettable Fuses Selection Notes

Select this component when a radial leaded form factor is required for through-hole PCB mounting. The 120 mA holding current suits low-power signal lines or control circuits. Verify that the 60 VDC rating aligns with the system's operating voltage. Consider the 16 Ohm initial resistance impact on signal integrity if used in sensitive data lines. Ensure the ambient temperature does not exceed the rated limits to maintain accurate tripping behavior.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 250R Series of PolySwitch resettable fuses. The series is engineered for applications requiring robust protection against overcurrent and short-circuit events. Radial leaded versions facilitate easy integration into printed circuit boards. The product line emphasizes reliability in telecom and industrial environments where repeated fault recovery is necessary without manual replacement.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse 250R series parts with identical electrical ratings, such as TRF250-120. Verify that any alternative maintains the same radial lead spacing and package dimensions for mechanical compatibility. Ensure the replacement meets the same voltage and current ratings to preserve circuit protection standards.