RUSBF120

Ptc Resettable Fuses Overview

The RUSBF120 is a polymer PTC self-resetting fuse from the POLY-FUSE USBR series, designed for radial through-hole mounting. It features a maximum operating voltage of 6V and a hold current (Ih) of 1.2A. The trip current (It) is specified at 2A, with a maximum surge current rating of 40A. Initial resistance (Ri) is typically 65 mOhms, while post-trip resistance (R1) has a maximum limit of 140 mOhms. The device operates within a temperature range of -40°C to +85°C and includes cURus and TUV certifications.

Ptc Resettable Fuses Feature Summary

• Polymer PTC technology provides automatic reset capability after fault conditions clear
• Radial disk package design facilitates easy through-hole PCB integration
• Certified for safety compliance with cURus and TUV standards

Ptc Resettable Fuses Applications

• USB port overcurrent protection in consumer electronics
• Low-voltage circuit protection for portable devices
• Battery pack protection in small form factor applications

Ptc Resettable Fuses Procurement Notes

Verify part authenticity by checking manufacturer markings against official datasheet specifications. Confirm that the component matches the USBR series characteristics, specifically the 6V rating and 1.2A hold current. Ensure the radial lead configuration aligns with your board layout requirements before finalizing procurement orders.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits requiring low-voltage protection with resettable functionality. The 6V rating suits USB-powered applications, while the 1.2A hold current accommodates standard peripheral loads. Consider the thermal environment, as operation up to 85°C may require derating in high-temperature enclosures compared to higher-rated industrial variants.

Ptc Resettable Fuses Part Context

The RUSBF120 belongs to Littelfuse's POLY-FUSE USBR series, which focuses on protecting sensitive electronic interfaces against overcurrent events. This series utilizes polymer composite technology to offer reliable protection without permanent circuit interruption, distinguishing it from traditional one-time fuses in reusable consumer hardware designs.

Ptc Resettable Fuses Replacement Considerations

The 06R120BPR is a confirmed obsolete substitute for this part number. Designers should evaluate the RUSBF120-2 as a similar alternative if supply chain constraints exist, ensuring electrical parameters remain compatible with the original design intent.