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MF-R300
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 3A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Bulk
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：3:00 AM
- Current - Trip (It)：6:00 AM
- Current - Max：40 A
- Time to Trip：10.8 s
- Resistance - Initial (Ri) (Min)：20 mOhms
- Resistance - Post Trip (R1) (Max)：80 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" L x 0.118" W (12.00mm x 3.00mm)
- Height - Seated (Max)：0.720" (18.30mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-R300 is a radial leaded PolySwitch resettable fuse from the MF-R series, designed for overcurrent protection in electronic circuits. It features a maximum operating voltage of 30 VDC and a hold current of 3 A. The device trips at 6 A and can withstand a maximum trip current of 40 A. With a typical resistance of 50 mΩ, it operates within a temperature range of -40°C to +85°C. The component has a height of 3 mm and a lead spacing of 5.1 mm, suitable for PCB mounting.
Feature Summary
- Provides automatic circuit recovery after fault conditions clear without manual replacement
- Offers high surge current capability up to 40 A for robust transient protection
- Features low on-resistance to minimize power loss during normal operation
Applications
- Overcurrent protection for portable electronics
- Surge protection in telecommunications equipment
- Circuit safeguarding in industrial control systems
Procurement Notes
Verify that the specific order matches the MF-R300 designation to ensure correct electrical ratings. Confirm RoHS compliance status if required by project specifications. Check datasheet for precise thermal derating curves relevant to your ambient operating conditions. Ensure PCB layout accommodates the 5.1 mm lead spacing and 3 mm component height for proper mechanical fit.
Selection Notes
Select this component when a 3 A hold current and 30 VDC rating align with system requirements. Consider the 50 mΩ resistance impact on circuit efficiency. Evaluate the 40 A max trip current against expected surge profiles. Verify that the -40°C to +85°C operating range covers environmental extremes. Compare physical dimensions against available board space constraints.
Part Context
The MF-R300 belongs to Bourns' MF-R series of resettable fuses, which are widely used for protecting sensitive electronics from overcurrent damage. This series offers a cost-effective alternative to traditional one-time fuses by allowing repeated use after tripping. The radial package facilitates easy through-hole integration into various printed circuit board designs.
Replacement Considerations
Consult official Bourns documentation for verified substitute part numbers. Do not assume cross-compatibility with other series without checking electrical parameters.
