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MF-R300-2-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 3A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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-R300-2-99 is a radial leaded Polymeric Positive Temperature Coefficient (PPTC) resettable fuse from the Multifuse MF-R series. It features a 30 VDC maximum voltage rating and a 3 A hold current. The device trips at 6 A and withstands up to 40 A maximum fault current. Its typical resistance is 50 mΩ, with an operating temperature range of -40°C to +85°C. The component utilizes a bulk packaging format and has a 5.1 mm lead spacing.
Feature Summary
- Provides automatic circuit protection through self-resetting thermal response to overcurrent conditions
- Designed for PCB mounting with radial leads for through-hole integration
- Constructed from polymeric materials that increase resistance significantly upon heating
Applications
- Overcurrent protection in consumer electronic devices
- Industrial instrumentation circuit safeguarding
- Power supply input protection
Procurement Notes
Verify the specific suffix '-2-99' against the official Bourns datasheet to confirm exact packaging or compliance variations. Ensure the selected variant matches the required hold current and voltage ratings for the target application. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity before procurement.
Selection Notes
Select this component when a 3 A continuous current capacity and 30 VDC rating are required. Verify that the 50 mΩ typical resistance meets the circuit's power loss constraints. Confirm that the radial lead configuration and 5.1 mm spacing fit the printed circuit board layout. Ensure the operating environment stays within the specified -40°C to +85°C temperature range.
Part Context
This part belongs to the Bourns Multifuse MF-R series of resettable fuses. These components serve as reusable alternatives to traditional fusible links. The series offers various current and voltage ratings for general-purpose circuit protection across industrial and consumer sectors.
Replacement Considerations
Consult the official Bourns replacement guide for direct equivalents. Verify that any substitute maintains identical hold current, trip current, and voltage ratings. Ensure physical dimensions and lead spacing match the existing footprint.
