MF-RX185/72-AP

Overview

The Bourns MF-RX185/72-AP is a radial leaded, resettable polymer PTC fuse from the Multifuse MF-RX/72 series. It features a 72 VDC maximum voltage rating and a 1.85 A hold current. The device trips at 3.7 A with a typical trip time of 12.6 seconds. It offers a maximum fault current rating of 40 A and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Provides overcurrent protection using a robust 125°C polymer PTC element designed for high-voltage and high-temperature environments.
• Eliminates nuisance tripping caused by ambient temperature variations while maintaining circuit integrity.
• Offers cost-effective, reusable circuit safeguarding compared to single-use fuses.

Applications

• Automotive circuitry protection
• Overcurrent surge protection for high-reliability electronic equipment
• Industrial transportation systems
• Communication infrastructure security

Procurement Notes

Verify that the specific suffix 'AP' matches the required packaging configuration, as standard variants may use different bulk or tape-and-reel formats. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the radial lead spacing aligns with the target PCB footprint design specifications.

Selection Notes

Select this component when a 72 VDC system requires a 1.85 A hold current with a 40 A interrupt capacity. The radial leaded package is suitable for through-hole mounting in layouts where surface area allows. Consider the 12.6-second trip characteristic for applications tolerant of delayed fault response.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series, which specializes in high-voltage resettable fuses. The series utilizes advanced polymer technology to deliver reliable protection in demanding electrical environments, distinguishing it from lower-voltage or axial-leaded alternatives within the broader product portfolio.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing circuit designs before attempting substitution with other series members.