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MF-RX185/72-AP-14
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Product Detailed Parameters
- Description：PTC RESET FUSE 72V 1.85A RADIAL
- Series：Multifuse®, MF-RX/72
- Mfr：Bourns Inc.
- Package：Tape & Box (TB)
- Type：Polymeric
- Voltage - Max：72V
- Current - Hold (Ih) (Max)：1.85 A
- Current - Trip (It)：3.7 A
- Current - Max：40 A
- Time to Trip：12.6 s
- Resistance - Initial (Ri) (Min)：80 mOhms
- Resistance - Post Trip (R1) (Max)：190 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.598" L x 0.122" W (15.18mm x 3.10mm)
- Height - Seated (Max)：0.785" (19.94mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-RX185/72-AP-14 is a radial leaded polymer positive temperature coefficient (PPTC) resettable fuse from the MF-RX/72 series. It features a hold current of 1.85 A and a maximum voltage rating of 72 VDC. The device trips at 3.7 A with a typical trip time of 12.6 seconds. Initial resistance is 120 mOhms, with a maximum rated current of 40 A. Operating temperature ranges from -40°C to +85°C. Physical dimensions include a diameter of 15.18 mm and a lead spacing of 5.1 mm.
Feature Summary
- Provides overcurrent protection through automatic resistance increase during fault conditions
- Enables circuit restoration without manual replacement after cooling
- Designed for robust performance in high-voltage and high-temperature environments
Applications
- Automotive electronic circuit protection
- Industrial transportation systems
- Communication equipment surge protection
- Consumer electronics power input safeguarding
Procurement Notes
Verify component authenticity by cross-referencing the manufacturer part number with official Bourns documentation. Confirm RoHS compliance status and specific package variations such as bulk packaging requirements. Ensure the selected variant matches the required axial or radial lead configuration for PCB mounting compatibility.
Selection Notes
Select this component when designing circuits requiring resettable protection for voltages up to 72 VDC. The 1.85 A hold current suits moderate load applications. Consider the 120 mOhms initial resistance for low-power loss requirements. Verify thermal management capabilities within the -40°C to +85°C operating range for environmental stability.
Part Context
This device belongs to the Bourns Multifuse MF-RX/72 series of PPTC resettable fuses. The series utilizes polymer PTC technology to offer cost-effective overcurrent protection. It serves as a reliable alternative to traditional fusible links in applications demanding repeated fault tolerance and space-efficient radial leaded mounting solutions.
Replacement Considerations
Equivalent alternatives within the MF-RX/72 series include MF-RX185/72-0 and MF-RX185/72-0-14. These variants share identical electrical ratings but may differ in packaging or specific certification suffixes. Verify mechanical fit and regulatory approvals before substitution.
