MF-R900-0-99

Overview

The MF-R900-0-99 is a radial, disc-shaped PTC resettable fuse manufactured by Bourns Inc. It features a hold current of 9A and a trip current of 18A, with a maximum voltage rating of 60VDC. The device has a maximum fault current rating of 40A and a post-trip resistance (R1) of 20 mOhms. It operates within a temperature range of -40°C to +85°C. The component utilizes wire terminals for through-hole PCB mounting and is supplied in bulk packaging.

Feature Summary

• Provides automatic circuit protection against overcurrent conditions using polymeric positive temperature coefficient technology.
• Offers repeatable protection by resetting automatically after the fault condition is removed and the device cools down.
• Designed for high-current applications requiring low resistance to minimize power loss during normal operation.

Applications

• Power supply input protection
• Battery pack protection circuits
• Industrial control system wiring

Procurement Notes

Verify component status carefully as this specific part number is listed as obsolete and no longer manufactured by Bourns Inc. Sourcing should focus on available substitutes or parametric equivalents rather than new production units. Confirm lead times and availability with authorized distributors immediately. Ensure that any replacement components meet the original electrical specifications, including the 9A hold current and 40A max current rating, to maintain system integrity.

Selection Notes

Select replacement devices based on matching key electrical parameters: 9A hold current, 60VDC max voltage, and 40A max interrupting current. Verify that the substitute supports radial through-hole mounting and operates within the -40°C to +85°C range. Consider physical dimensions to ensure compatibility with existing PCB footprints. Prioritize components from reputable manufacturers with established reliability records in circuit protection applications.

Part Context

This component belongs to the Multifuse family of PTC resettable fuses from Bourns Inc., designed for electronic circuit protection. These devices serve as alternative protection mechanisms to traditional one-time fuses, offering convenience through automatic reset capabilities. The MF-R series is engineered for robust performance in various industrial and consumer electronics environments where reliable overcurrent protection is critical.

Replacement Considerations

Official substitutes include MF-R900-AP and MF-R900-2. These variants share identical electrical characteristics but differ in packaging formats, such as ammo pack or reel/cut tape options. Verify that the selected substitute maintains the same radial disc form factor and terminal configuration for direct board compatibility.

FAQ

What is the maximum fault current rating for the MF-R900-0-99?

The maximum fault current rating is 40A.

Does the MF-R900-0-99 support automatic reset after tripping?

Yes, it is a PTC resettable fuse that automatically resets once the overcurrent condition is removed and the device cools down.