250R120-R2ZR

Ptc Resettable Fuses Overview

The Littelfuse Inc. 250R120-R2ZR is a polymeric PTC resettable fuse from the 250R Series, designed for radial through-hole mounting. It features a hold current of 120 mA and a trip current of 240 mA. The device supports a maximum voltage of 60 VDC with an internal rating of 250V, and handles a maximum rated current of 3 A. Operating within a temperature range of -40°C to +85°C, it offers high resistance of 16 ohms and is supplied in tape and ammo packaging.

Ptc Resettable Fuses Feature Summary

• Provides protection against short duration high voltage fault currents such as power cross or induction surges
• Utilizes polymeric PTC technology for automatic circuit reset after fault clearance
• Engineered specifically for telecom applications requiring robust circuit protection

Ptc Resettable Fuses Applications

• Telecom equipment protection
• Access equipment circuits
• LAN/WAN equipment safeguarding

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix ZR indicates tape and ammo packaging configuration when sourcing. Confirm that the 60VDC maximum voltage rating aligns with system requirements, noting the 250V internal classification. Ensure the radial leaded package fits the PCB layout constraints. Cross-reference the datasheet for thermal derating curves relevant to the operating environment.

Ptc Resettable Fuses Selection Notes

Select this component for circuits requiring resettable overcurrent protection in telecom infrastructure. The 120 mA hold current suits low-power signal lines. Verify compatibility with peak surge currents expected in the application. Consider the 16-ohm resistance impact on signal integrity. Ensure the radial disc package accommodates available board space.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 250R Series of POLY-FUSE resettable PTC devices. The series is characterized by radial leaded construction and is optimized for protecting sensitive electronics against transient high-voltage faults common in telecommunications environments. It serves as a reusable alternative to traditional fuses.

Ptc Resettable Fuses Replacement Considerations

Compatible substitutes include the 250R120-R2 and 250R120 variants. Verify that alternative packages match the radial leaded form factor. Ensure electrical parameters such as hold current and voltage ratings remain consistent with the original design specifications.