250R120-RAU

Ptc Resettable Fuses Overview

The Littelfuse 250R120-RAU is a radial-leaded PolySwitch resettable PTC device designed for overcurrent protection. It features a holding current of 120 mA and a trip current of 650 mA, with a maximum voltage rating of 60 VDC. The component exhibits a maximum resistance of 4 Ohms and can withstand a maximum fault current of 10 A. It operates within a temperature range of -40°C to +85°C and has a power dissipation rating of 1.8 W. The device utilizes a bulk packaging format and is constructed for PCB mounting applications.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection against short duration high voltage fault currents
• Automatically resets to low resistance state after fault conditions clear
• Offers compact form factor suitable for dense PCB layouts

Ptc Resettable Fuses Applications

• LAN/WAN equipment circuit protection
• Access equipment line protection
• Telecom interface circuits

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'RAU' against official Littelfuse documentation to confirm lead coating or marking variations. Ensure the procurement order matches the exact part number to avoid confusion with standard 250R series variants. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing purchase orders.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits requiring resettable protection for low-current data lines. The 120 mA holding current suits sensitive signal paths. Verify that the 60 VDC rating aligns with the system's maximum operating voltage. Consider the 4 Ohm initial resistance impact on signal integrity during normal operation.

Ptc Resettable Fuses Part Context

This device belongs to the 250R Series of PolySwitch resettable fuses. The series is engineered specifically for protecting telecommunications and networking infrastructure from overcurrent events. It serves as a reusable alternative to traditional one-time fuses in consumer electronics and industrial control systems.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other 250R series parts with identical electrical ratings such as 250R120. Verify physical dimensions and lead spacing compatibility before substitution. Cross-reference Littelfuse replacement guides for approved equivalent components.