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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 1.85A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Cut Tape (CT),Tape & Box (TB)
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：1.85 A
- Current - Trip (It)：3.7 A
- Current - Max：40 A
- Time to Trip：8.7 s
- Resistance - Initial (Ri) (Min)：40 mOhms
- Resistance - Post Trip (R1) (Max)：110 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.472" Dia x 0.118" T (12.00mm x 3.00mm)
- Height - Seated (Max)：0.724" (18.40mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-R185-AP is a radial leaded PolySwitch resettable fuse from the Multifuse MF-R/72 series. It features a hold current of 1.85 A and a trip current of 3.7 A, rated for a maximum voltage of 72 VDC. The device has a maximum resistance of 120 mΩ and a maximum fault current rating of 40 A. It operates within a temperature range of -40°C to +85°C with a lead spacing of 5.1 mm.
Feature Summary
- Provides automatic circuit protection against overcurrent conditions through positive temperature coefficient behavior
- Offers repeated service capability by resetting automatically after fault clearance without replacement
- Designed for PCB mounting with radial leads for straightforward integration into electronic assemblies
Applications
- Overcurrent protection in consumer electronics circuits
- Surge protection in telecommunications equipment
- Circuit safeguarding in industrial instrumentation systems
Procurement Notes
Verify the specific suffix designation against official Bourns documentation to confirm exact electrical tolerances and packaging specifications. Ensure the selected variant matches the required voltage and current ratings for the target application circuit design.
Selection Notes
Select this component based on the 1.85 A hold current requirement and 72 VDC maximum voltage rating. Confirm that the 120 mΩ resistance and 40 A maximum fault current capabilities align with the system's safety margins and operational constraints.
Part Context
This part belongs to the Bourns Multifuse MF-R/72 series of resettable fuses. These components are engineered for circuit protection applications where automatic recovery is preferred over traditional replaceable fuses. The series is widely used across various electronic industries for reliable overcurrent management.
Replacement Considerations
Consult official Bourns substitution guides for verified equivalents. Generic PTC fuses may not match the precise trip characteristics or physical dimensions required for direct replacement.
