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MF-RX375/72-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 72V 3.75A 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)：3.75 A
- Current - Trip (It)：7.5 A
- Current - Max：40 A
- Time to Trip：24 s
- Resistance - Initial (Ri) (Min)：30 mOhms
- Resistance - Post Trip (R1) (Max)：80 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.926" L x 0.122" W (23.51mm x 3.10mm)
- Height - Seated (Max)：1.161" (29.50mm)
- Thickness (Max)：-
- Lead Spacing：0.402" (10.20mm)
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Overview
The Bourns MF-RX375/72-2 is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. It features a holding current of 3.75 A and a trip current of 7.5 A at ambient conditions. The device supports a maximum voltage of 72 VDC with a maximum fault current rating of 40 A. Its initial resistance is 50 mΩ maximum, and it operates within a temperature range of -40°C to +85°C. Physical dimensions include a length of 23.51 mm, height of 3.1 mm, and a lead spacing of 10.2 mm.
Feature Summary
- Provides automatic circuit protection by increasing resistance significantly upon overheating or overcurrent events
- Self-restores conductivity after the fault condition is removed and the device cools down
- Designed for through-hole PCB mounting using radial leads
Applications
- Overcurrent protection in consumer electronic devices
- Protection circuits in industrial control systems
- Surge and overload safeguarding in telecommunications equipment
Procurement Notes
Verify that the specific ordering suffix matches the required packaging configuration, as variations exist between bulk and reel formats. Confirm compliance with RoHS directives and UL certification requirements for the target market. Ensure the selected variant aligns with the necessary thermal and electrical ratings for the final assembly environment.
Selection Notes
Select this component when a 3.75 A continuous current capacity is required with a 72 VDC system limit. The radial leaded package facilitates standard through-hole assembly processes. Evaluate the 50 mΩ resistance impact on low-voltage drop applications and ensure the 40 A interrupt rating exceeds potential fault currents in the design.
Part Context
This part belongs to the Bourns Multifuse MF-RX/72 family of PTC resettable fuses. The series offers various current ratings within a standardized 72 VDC voltage class. These components are engineered for general-purpose circuit protection across automotive, industrial, and consumer electronics sectors.
Replacement Considerations
Cross-reference with other MF-RX/72 series variants such as MF-RX375/72-0 if different packaging is acceptable. Verify equivalent electrical parameters including holding current, trip current, and maximum voltage before substitution.
