MF-RX300/72-0

Overview

The Bourns MF-RX300/72-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a hold current of 3 A and a trip current of 6 A, with a maximum voltage rating of 72 VDC and a maximum fault current of 40 A. The device has a typical resistance of 60 mOhms and operates within a temperature range of -40°C to +85°C. Physical dimensions include a length of 26.7 mm, width of 20.67 mm, height of 3.1 mm, and a lead spacing of 10.2 mm. Power dissipation is rated at 2.8 W.

Feature Summary

• Provides automatic circuit protection through reversible polymer technology that increases resistance upon overcurrent conditions
• Designed for PCB mounting with radial leads for straightforward integration into electronic assemblies
• Capable of handling high fault currents up to 40 A while maintaining a low profile form factor

Applications

• Overcurrent protection in portable computing devices and peripherals
• Protection circuits for battery packs and power supplies
• Surge protection in telecommunications equipment and data lines

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number MF-RX300/72-0 with official Bourns documentation. Confirm compliance with RoHS directives and check for specific packaging configurations such as bulk quantities. Ensure the supplier provides valid traceability records and material declarations to guarantee component integrity during procurement.

Selection Notes

Select this component when circuit design requires a 3 A hold current and 72 VDC maximum voltage rating. Consider the 60 mOhms resistance and 2.8 W power dissipation for thermal management calculations. Evaluate the 10.2 mm lead spacing and 26.7 mm length against available PCB footprint constraints to ensure mechanical compatibility with the target assembly layout.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series of PTC resettable fuses. The series offers various current ratings optimized for consumer electronics and industrial applications. The MF-RX300/72-0 specifically addresses higher current requirements within the 72 VDC voltage class, providing robust protection against accidental short circuits and overloads in compact electronic designs.

Replacement Considerations

Consult the official Bourns replacement guide for verified substitute part numbers. Direct replacements must match the 72 VDC voltage rating, 3 A hold current, and radial lead configuration. Verify dimensional compatibility and thermal characteristics before integrating alternative components into existing circuit layouts.