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MF-S420S
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 4.2A STRAP
- Series：Multifuse®, MF-S
- Mfr：Bourns Inc.
- Package：Bulk
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：4.2 A
- Current - Trip (It)：7.6 A
- Current - Max：100 A
- Time to Trip：6 s
- Resistance - Initial (Ri) (Min)：12 mOhms
- Resistance - Post Trip (R1) (Max)：40 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：User Defined
- Package / Case：Strap
- Size / Dimension：1.240" L x 0.522" W (31.50mm x 13.25mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.043" (1.10mm)
- Lead Spacing：-
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Overview
The Bourns MF-S420S is a resettable fuse from the MF-S Series, designed for overcurrent protection in electronic circuits. It utilizes Positive Temperature Coefficient (PTC) polymer technology to provide automatic recovery after fault conditions clear. This component serves as a reliable alternative to traditional fuses, offering repeated use without replacement. It is engineered to handle specific current thresholds and voltage ratings suitable for various commercial and industrial applications requiring robust circuit safeguarding.
Feature Summary
- Automatic reset capability eliminates the need for manual replacement after tripping events
- Positive Temperature Coefficient (PTC) polymer construction ensures rapid response to overcurrent conditions
- Compact surface-mount or through-hole design facilitates integration into dense circuit layouts
- Provides dual protection against overcurrent and excessive temperature rise
Applications
- Portable electronics battery pack protection
- Consumer appliance power supply circuits
- Industrial control system input/output modules
- Telecommunications equipment interface protection
Procurement Notes
Verify the specific suffix codes on the part number to confirm package type, termination style, and certification status such as UL or VDE approval. Ensure the selected variant matches the required holding current and trip current specifications for the target application. Confirm RoHS compliance documentation is available if environmental regulations apply to the manufacturing process.
Selection Notes
Select this component based on the maximum operating voltage and the continuous current requirements of the protected circuit. Evaluate the time-current characteristics to ensure adequate protection speed without nuisance tripping during normal startup surges. Consider the ambient temperature range and derating factors that may affect the holding current performance in the final assembly environment.
Part Context
This device belongs to the MF-S Series of resettable fuses manufactured by Bourns Inc. The series is widely recognized for providing cost-effective overcurrent protection solutions across multiple industries. These components are commonly used in conjunction with other passive elements to create comprehensive circuit protection strategies.
Replacement Considerations
Consult official Bourns substitution guides for direct equivalents within the MF-S or MF-USHT series. Verify that any substitute part meets or exceeds the original voltage, current, and physical dimension requirements. Cross-reference certification listings to ensure regulatory compliance remains intact.
