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MF-RX300/72-2-14
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Product Detailed Parameters
- Description：PTC RESET FUSE 72V 3A RADIAL
- Series：Multifuse®, MF-RX/72
- Mfr：Bourns Inc.
- Package：Tape & Box (TB)
- 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)：0.839" (21.30mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-RX300/72-2-14 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 exhibits a maximum resistance of 60 mOhms and supports a maximum fault current of 40 A. It operates within a temperature range of -40°C to +85°C, with a lead spacing of 10.2 mm.
Feature Summary
- Provides automatic circuit protection through positive temperature coefficient polymer technology
- Offers reliable resettable functionality after fault conditions clear
- Designed for surface mount or through-hole PCB integration
Applications
- Overcurrent protection in portable electronic devices
- Protection circuits for battery-powered equipment
- Interface protection for communication ports
Procurement Notes
Verify the specific suffix '-14' against official Bourns documentation to confirm packaging configuration, as standard datasheets may list bulk or reel options without this exact identifier. Ensure the component matches the required 72V rating and 3A hold current specifications for your design. Cross-reference the lead spacing and physical dimensions with your PCB footprint requirements before finalizing procurement.
Selection Notes
Select this component when a 3.0 A hold current and 72 VDC maximum voltage are required for overcurrent protection. Consider the 60 mOhms resistance for power dissipation calculations and the 40 A maximum fault current capability for short-circuit scenarios. Verify that the operating temperature range of -40°C to +85°C aligns with the environmental conditions of the target application.
Part Context
This part belongs to the Bourns Multifuse MF-RX/72 series of PTC resettable fuses. The series is characterized by radial leaded construction and is designed for general-purpose circuit protection. The 'RX' designation typically indicates a specific body style or performance characteristic within the broader Multifuse lineup, offering a balance of holding current and physical size.
Replacement Considerations
Compatible substitutes include other Bourns MF-RX series parts with matching electrical ratings, such as MF-RX300/72-0 or MF-RX300/72-AP, provided the packaging and lead spacing are compatible. Verify that any replacement maintains the same 72V voltage rating and 3.0A hold current to ensure circuit integrity.
