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MF-R400-2
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 4A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：4:00 AM
- Current - Trip (It)：8:00 AM
- Current - Max：40 A
- Time to Trip：12.7 s
- Resistance - Initial (Ri) (Min)：10 mOhms
- Resistance - Post Trip (R1) (Max)：50 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.567" L x 0.118" W (14.40mm x 3.00mm)
- Height - Seated (Max)：0.976" (24.80mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The MF-R400-2 is a resettable fuse from the Multifuse series, designed for overcurrent protection in electronic circuits. It functions as a polymeric positive temperature coefficient (PPTC) device that increases resistance significantly upon detecting excessive current flow, thereby limiting the current to safe levels. Once the fault condition is removed and the device cools down, it automatically resets to its original low-resistance state, ensuring continuous circuit operation without manual intervention.
Feature Summary
- Automatic reset functionality eliminates the need for manual replacement after tripping events
- High reliability through solid-state construction with no moving parts or fusing elements
- Compact surface-mount design facilitates integration into space-constrained printed circuit boards
Applications
- Overcurrent protection for portable consumer electronics
- Surge protection in telecommunications equipment interfaces
- Battery pack safeguarding in mobile devices
Procurement Notes
Verify the specific package type and lead time requirements directly with authorized distributors before ordering. Confirm that the holding current and trip current ratings align precisely with the target application's operational parameters to ensure reliable performance under all expected load conditions.
Selection Notes
Select this component based on the required maximum operating voltage and the specific hold current threshold needed for the protected circuit. Ensure the physical footprint matches the available board space and that the thermal environment supports the necessary cooling for automatic reset functionality during normal operation.
Part Context
This part belongs to Bourns' Multifuse family of resettable fuses, which are widely used across various industries including automotive, industrial, and consumer electronics. The series offers a range of voltage and current ratings to provide flexible overcurrent protection solutions for diverse circuit designs.
Replacement Considerations
Consult official Bourns documentation for direct cross-reference equivalents within the same Multifuse series. Verify that any substitute part meets identical electrical specifications and mechanical dimensions to maintain circuit integrity and compliance.
