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MF-RX050/72-0
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Product Detailed Parameters
- Description：PTC RESET FUSE 72V 500MA RADIAL
- Series：Multifuse®, MF-RX/72
- Mfr：Bourns Inc.
- Package：Bulk
- Type：Polymeric
- Voltage - Max：72V
- Current - Hold (Ih) (Max)：500 mA
- Current - Trip (It)：1:00 AM
- Current - Max：40 A
- Time to Trip：4 s
- Resistance - Initial (Ri) (Min)：410 mOhms
- Resistance - Post Trip (R1) (Max)：1.17 Ohms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.311" Dia x 0.122" T (7.90mm x 3.10mm)
- Height - Seated (Max)：0.539" (13.70mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-RX050/72-0 is a radial leaded PPTC resettable fuse from the Multifuse MF-RX/72 series. It features a maximum voltage rating of 72 VDC and a hold current of 500 mA. The trip current is specified at 1 A, with a maximum fault current rating of 40 A. The device operates within a temperature range of -40°C to +85°C and offers a typical resistance of 360 mΩ. Certified under UL and RoHS standards, it provides overcurrent protection for PCB-mounted applications.
Feature Summary
- Utilizes polymer positive temperature coefficient technology for automatic circuit recovery after fault conditions.
- Provides robust overcurrent and surge protection in high-voltage environments up to 72 VDC.
- Eliminates nuisance tripping caused by ambient temperature variations during normal operation.
Applications
- Automotive electronic circuit protection
- Consumer electronics power supply input stages
- Industrial control system overcurrent safeguarding
Procurement Notes
Verify the specific hold current and trip parameters against the official Bourns datasheet for the MF-RX050/72-0 part number before integration. Confirm that the radial lead spacing and physical dimensions match the target PCB footprint requirements. Ensure compliance with relevant safety certifications such as UL and RoHS for the intended market application.
Selection Notes
Select this component when designing circuits requiring resettable protection at 72 VDC with a nominal 500 mA operating current. Consider the thermal derating characteristics and the maximum fault current capability of 40 A. Evaluate the trade-off between low on-resistance and physical size constraints for the specific board layout.
Part Context
This device belongs to the Multifuse MF-RX/72 series, designed for high-reliability applications. It serves as a reusable alternative to traditional one-time fuses, reducing maintenance costs. The series is engineered for use in automotive, industrial, and consumer markets where space efficiency and circuit integrity are critical priorities.
Replacement Considerations
Consult the manufacturer's cross-reference documentation for verified substitute part numbers. Do not assume functional equivalence with other series without confirming electrical parameter alignment and physical compatibility.
