MF-RX300-2

Overview

The Bourns MF-RX300-2 is a radial leaded polymer PTC resettable fuse from the Multifuse RX series. It features a hold current of 3.0 A and a trip current of 6.0 A, with a maximum voltage rating of 72 VDC. The device has a maximum resistance of 1.36 ohms and operates within a temperature range of -40°C to +85°C. It utilizes a 5.1 mm lead spacing for PCB mounting.

Feature Summary

• Provides automatic circuit protection against overcurrent conditions through positive temperature coefficient behavior
• Offers reusable functionality by resetting automatically after fault clearance without manual intervention
• Designed for robust performance in demanding thermal environments up to 85°C

Applications

• Overcurrent protection for portable electronic devices
• Protection circuits in automotive electronics
• Industrial equipment power supply lines
• Consumer appliance control boards

Procurement Notes

Verify the specific suffix designation to ensure correct packaging configuration and compliance status. Confirm that the selected variant matches the required hold and trip current specifications for the target application circuit. Cross-reference the datasheet for precise dimensional tolerances and thermal derating curves before final integration.

Selection Notes

Select this component when a high-voltage rating of 72 VDC is required alongside a 3.0 A hold current. Ensure the application environment remains within the specified -40°C to +85°C operating range. Consider the radial leaded package for through-hole PCB assembly requirements where space constraints allow for the associated footprint dimensions.

Part Context

This part belongs to the Bourns Multifuse RX series, which focuses on higher voltage capabilities compared to standard low-voltage PTC fuses. The series is engineered for applications requiring reliable overcurrent protection in systems operating at elevated voltages while maintaining compact form factors suitable for dense PCB layouts.

Replacement Considerations

Direct substitutes include other Bourns MF-RX series variants with matching electrical ratings. Verify compatibility with equivalent hold current, maximum voltage, and physical package dimensions from alternative manufacturers if sourcing changes are necessary.