MF-RX090/72-0

Overview

The Bourns MF-RX090/72-0 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a maximum voltage rating of 72 VDC and a hold current of 0.9 A, with a trip current of 1.8 A. The device has a maximum fault current rating of 40 A and a typical trip time of 7.2 seconds. Electrical resistance ranges from a minimum of 0.14 Ω to a maximum of 470 mΩ, with a power dissipation of 1 W. Physical dimensions include a length of 11.7 mm, height of 16.7 mm, and width of 3.1 mm. It operates within a temperature range of -40°C to +85°C and complies with UL and RoHS standards.

Feature Summary

• Provides automatic circuit protection through self-resetting PPTC technology without manual intervention after fault clearance.
• Offers high fault current interruption capability up to 40 A for robust overcurrent defense.
• Features radial leaded construction designed for reliable PCB mounting in compact electronic assemblies.

Applications

• LED driver circuit protection
• Current control systems
• Overheat prevention circuits
• Surge and electrostatic discharge mitigation

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number MF-RX090/72-0 with official Bourns documentation. Confirm that the received items match the specified electrical parameters, including the 0.9 A hold current and 72 VDC rating. Ensure compliance with required safety certifications such as UL and environmental standards like RoHS before integration into production lines.

Selection Notes

Select this component when designing circuits requiring a 72 VDC rated resettable fuse with a 0.9 A nominal operating current. It is suitable for applications needing rapid response to overcurrent conditions, indicated by the 1.8 A trip threshold. Consider the physical footprint of 11.7 mm length and 3.1 mm width for PCB layout constraints. Evaluate the 1 W power dissipation rating against thermal management requirements in the target environment.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series of PPTC resettable fuses. The series is characterized by radial leaded packages and 72 VDC voltage ratings. These components are engineered for general-purpose overcurrent protection in various electronic devices, offering a reusable alternative to traditional one-time fuses while maintaining compact form factors suitable for dense board layouts.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided data. Designers should consult official Bourns resources or authorized distributors for equivalent alternatives if this specific part number becomes unavailable.

FAQ

What is the maximum fault current rating for the MF-RX090/72-0?

The maximum fault current rating is 40 A, allowing it to interrupt significant overcurrent events safely.

Does the MF-RX090/72-0 require manual replacement after tripping?

No, it is a self-resetting PPTC device that automatically returns to a low-resistance state once the fault condition is removed and the component cools down.