MF-USML400/12-2

Overview

The MF-USML400/12-2 is a polymeric resettable fuse manufactured by Bourns Inc. It belongs to the Multifuse MF-USML series and utilizes surface mount technology in a 1210 (3225 Metric) package. The device features a hold current of 4 A and a trip current of 12 A, with a maximum voltage rating of 12 V. It exhibits a time-to-trip characteristic of 5 seconds under specified conditions and supports a maximum current capacity of 50 A.

Feature Summary

• Polymeric construction for reliable circuit protection
• Surface mount design for automated assembly integration
• Resettable functionality after fault condition removal

Applications

• Portable electronic devices requiring overcurrent protection
• Consumer electronics circuits
• Battery-powered equipment safeguarding

Procurement Notes

Verify that the specific part number matches the required electrical ratings, particularly the 4 A hold current and 12 V maximum voltage. Confirm the package type is 1210 SMD. Ensure compatibility with the intended application's thermal environment and current requirements before finalizing procurement orders.

Selection Notes

Select this component when a compact, surface-mountable resettable fuse is required for low-voltage applications. The 1210 footprint offers a balance between current handling capability and board space efficiency. Consider the 5-second trip time for applications where transient surges must be tolerated without nuisance tripping.

Part Context

This component is part of Bourns' Multifuse MF-USML line, designed for protecting sensitive electronic circuits from overcurrent events. It serves as a reusable alternative to traditional one-time fuses, reducing maintenance needs in inaccessible or hard-to-reach electronic assemblies.

Replacement Considerations

Cross-reference models include MF-USML350/12-2 for lower current requirements and MF-USML450/12-2 for higher current needs within the same series and package configuration.