RUSBF075-2

Ptc Resettable Fuses Overview

The Littelfuse RUSBF075-2 is a PolySwitch self-resetting fuse designed for overcurrent protection in low-voltage circuits. It features a maximum voltage rating of 6V and a hold current (Ih) of 750 mA. The trip current (It) is specified at 1.3 A, with a maximum trip time of 400 ms under fault conditions. Initial resistance ranges from a minimum of 110 mOhms to a maximum of 450 mOhms, while post-trip resistance is capped at 230 mOhms. The device supports a maximum fault current of 40 A and operates within a temperature range of -40°C to 85°C. It utilizes a radial, disc-style through-hole package measuring 6.90 mm in length, 3.00 mm in width, and 11.40 mm in height.

Ptc Resettable Fuses Feature Summary

• Polymer PTC technology provides automatic circuit recovery after fault clearance without manual replacement.
• Radial disc-style through-hole construction facilitates easy integration into standard PCB layouts.
• Certified by UL, CSA, and TUV agencies for compliance with international safety standards.

Ptc Resettable Fuses Applications

• Overcurrent protection for portable electronic devices
• Circuit safeguarding in battery-powered equipment
• Protection for communication interface ports

Ptc Resettable Fuses Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to ensure correct packaging configuration, such as tape-and-reel or cut-strip formats. Confirm that the selected variant matches the required lead frame material and terminal plating specifications for your soldering process. Cross-reference the part number with official Littelfuse documentation to validate current production status and availability before finalizing procurement orders.

Ptc Resettable Fuses Selection Notes

Select this component when designing circuits requiring resettable protection for low-voltage applications up to 6V. Ensure the operating current remains below the 750 mA hold threshold to prevent nuisance tripping during normal operation. Verify that the expected fault current does not exceed the 40 A maximum interrupt rating. Consider the thermal environment, as the device performance is rated up to 85°C ambient temperature.

Ptc Resettable Fuses Part Context

This component belongs to the Littelfuse PolySwitch RUSBF series, which focuses on compact, radial-leaded polymer resettable fuses. The series is engineered for cost-effective overcurrent protection in consumer electronics and industrial control systems where space constraints and reusability are critical design factors.

Ptc Resettable Fuses Replacement Considerations

Consult the official Littelfuse substitution guide for verified equivalent part numbers. Do not assume cross-compatibility based solely on electrical ratings; verify package dimensions and certification approvals match the original design requirements.

Ptc Resettable Fuses FAQ

What is the maximum voltage rating for the RUSBF075-2?

The maximum working voltage is 6V DC.

How does the RUSBF075-2 recover from a fault condition?

It automatically resets to a low-resistance state once the fault current is removed and the device cools down.