RUSBF120-2

Ptc Resettable Fuses Overview

The RUSBF120-2 is a polymer PTC self-resetting fuse from the POLY-FUSE USBR series, designed for overcurrent protection in low-voltage circuits. It features a radial, disc-style through-hole package with a maximum voltage rating of 6V and a hold current (Ih) of 1.2A. The device trips at 2A and can withstand a maximum fault current of 40A. Initial resistance is typically 65 mOhms minimum, rising to 140 mOhms maximum after tripping. It operates within a temperature range of -40°C to 85°C and carries cURus and TUV certifications.

Ptc Resettable Fuses Feature Summary

• Self-resetting polymer positive temperature coefficient (PTC) technology provides automatic circuit recovery after fault clearance.
• Radial disc-style through-hole mounting facilitates easy integration into standard PCB layouts.
• Certified by UL and TUV agencies for global compliance and safety recognition.

Ptc Resettable Fuses Applications

• USB port overcurrent protection
• Portable electronic device circuit safeguarding
• Low-voltage battery-powered equipment protection

Ptc Resettable Fuses Procurement Notes

Verify component authenticity against Littelfuse official documentation. Confirm that the specific part number matches the required electrical ratings and certification marks. Check for obsolescence status as this model may be discontinued or subject to change. Ensure storage conditions comply with moisture sensitivity level requirements before soldering.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits requiring resettable protection for 6V systems with currents up to 1.2A. Consider the radial form factor for through-hole assembly needs. Evaluate the trip current and hold current margins against the application's normal operating load to ensure reliable performance without nuisance tripping during startup transients.

Ptc Resettable Fuses Part Context

This device belongs to the POLY-FUSE USBR series, which focuses on compact circuit protection solutions. The series is engineered for applications where space is limited but reliable overcurrent protection is critical. It serves as a reusable alternative to traditional one-time fuses in consumer electronics and data interface protection scenarios.

Ptc Resettable Fuses Replacement Considerations

The RUSBF120-2 is listed as obsolete. The confirmed substitute part number is RUSBF120-2. Verify pinout compatibility and thermal characteristics before implementation.