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MF-RX300/72-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 72V 3A RADIAL
- Series：Multifuse®, MF-RX/72
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：72V
- Current - Hold (Ih) (Max)：3:00 AM
- Current - Trip (It)：6:00 AM
- Current - Max：40 A
- Time to Trip：19.8 s
- Resistance - Initial (Ri) (Min)：40 mOhms
- Resistance - Post Trip (R1) (Max)：100 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.814" L x 0.122" W (20.67mm x 3.10mm)
- Height - Seated (Max)：1.050" (26.67mm)
- Thickness (Max)：-
- Lead Spacing：0.402" (10.20mm)
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Overview
The Bourns MF-RX300/72-2 is a radial leaded PTC resettable fuse from the Multifuse MF-RX/72 series. It features a hold current of 3.0 A and a trip current of 6.0 A at maximum voltage of 72 VDC. The device has a maximum resistance of 60 mOhms and a maximum fault current rating of 40 A. It operates within a temperature range of -40°C to +85°C with a lead spacing of 10.2 mm. Physical dimensions include a diameter of 20.67 mm, height of 3.1 mm, and length of 26.7 mm. Power dissipation is rated at 2.8 W.
Feature Summary
- Provides automatic circuit protection through positive temperature coefficient polymer technology that increases resistance during overcurrent events.
- Offers resettable functionality allowing the component to return to low-resistance state after fault conditions clear without manual replacement.
- Designed for PCB mounting with radial leads suitable for through-hole integration in electronic assemblies.
Applications
- Overcurrent protection in industrial control systems
- Circuit safeguarding in consumer electronics power supplies
- Protection for automotive electrical circuits requiring high current handling
Procurement Notes
Verify the specific suffix designation against official manufacturer documentation to confirm exact physical and electrical characteristics. Ensure compatibility with existing board layouts regarding lead spacing and thermal requirements. Confirm RoHS compliance status through current datasheets as specifications may evolve. Cross-reference part numbers with authorized distributors to avoid counterfeit components.
Selection Notes
Select this component when applications require a high-current resettable fuse with a 72 VDC maximum voltage rating. Consider the 3.0 A hold current and 6.0 A trip current thresholds relative to normal operating loads. Evaluate the 40 A maximum fault current capability against potential short-circuit scenarios. Verify that the radial lead configuration fits the target printed circuit board design constraints.
Part Context
This part belongs to the Bourns Multifuse MF-RX/72 series of PTC resettable fuses. The series provides various current ratings for circuit protection needs. The MF-RX300 variant specifically addresses higher current applications compared to lower-rated counterparts in the same family. It utilizes polymer technology for reliable performance across specified temperature ranges.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided source material. Consult official Bourns documentation or authorized distributors for verified alternatives if this specific model is unavailable.
