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MF-RX185/72-0
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Product Detailed Parameters
- Description：PTC RESET FUSE 72V 1.85A RADIAL
- Series：Multifuse®, MF-RX/72
- Mfr：Bourns Inc.
- Package：Bulk
- 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：0.701" L x 0.122" W (17.80mm x 3.10mm)
- Height - Seated (Max)：0.902" (22.90mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-RX185/72-0 is a radial leaded, resettable PTC fuse from the Multifuse MF-RX/72 series. It features a hold current of 1.85 A and a trip current of 3.7 A. The device supports a maximum voltage of 72 VDC with a maximum fault current rating of 40 A. Initial resistance is typically 120 mOhms, ranging up to 190 mOhms maximum. It operates within a temperature range of -40°C to +85°C and has a power dissipation rating of 2.1 W. Physical dimensions include a diameter of 15.18 mm and a height of 21.18 mm.
Feature Summary
- Provides automatic circuit protection through polymer positive temperature coefficient (PPTC) technology that resets after fault clearance.
- Offers high fault current capability rated at 40 A maximum for robust surge handling.
- Features a compact radial leaded package designed for standard PCB mounting applications.
Applications
- Consumer electronics power supply input protection
- Industrial instrumentation circuit safeguarding
- Telecommunications equipment line protection
Procurement Notes
Verify component authenticity by cross-referencing the manufacturer part number MF-RX185/72-0 with official Bourns documentation. Confirm RoHS compliance status and UL certification marks on the physical device or accompanying datasheet. Ensure the supplier provides valid traceability records matching the specific Multifuse series designation.
Selection Notes
Select this component when circuit protection requires a 1.85 A hold current and 72 VDC operating voltage. The 120 mOhms initial resistance suits low-power loss applications. Verify that the 2.1 W power dissipation rating accommodates the thermal environment. Ensure the 40 A interrupt rating exceeds potential fault currents in the target design.
Part Context
This part belongs to the Bourns Multifuse MF-RX/72 series of resettable fuses. The series utilizes polymer PTC technology for overcurrent protection. The MF-RX185/72-0 variant specifically addresses higher current requirements within the 72 VDC voltage class compared to lower amperage counterparts in the same family.
Replacement Considerations
Direct substitutes within the same series include MF-RX160/72-0 for lower current needs. For higher current ratings, consider MF-RX200/72-0 if available. Verify that any replacement maintains the 72 VDC maximum voltage and radial leaded package configuration.
