MF-SM050-2 Circuit Protection

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PTC Resettable Fuses are widely used in many electrical systems for their ability to provide reliable overcurrent protection with automatic reset capability. One of the most popular resettable fuse products is the MF-SM050-2, which is designed to provide protection circuit for motors, switches and other components. In this article, we will discuss the application field and working principle of the MF-SM050-2 fuse.

Application Field

The most common application for the MF-SM050-2 fuse is in motor protection circuits. Its melting point is high and its short-time current capacity is up to 28 times of its rated current. This means that the fuse can handle high overload and short-circuit current, which is very important for motor protection circuits. It can also be used in the protection circuits of pumps, electrical tools, transformers and electric appliances.

The MF-SM050-2 fuse also finds its applications in the power failure and overcurrent control systems of power supplies and batteries. Due to its high current-temperature performance and low profile, it is suitable for small, densely populated boards.

Working Principle

The MF-SM050-2 is a self-resetting fuse that is triggered by the heat caused by an overcurrent event. This is how it works:

• When the device is operating normally, the fuse is in the "on" state, allowing current to flow through.
• If an overcurrent occurs, the fuse heats up, causing the internal element to expand and break the wire contact, thus shutting off the flow of current.
• Once the current is shut off, the fuse cools down and the element contracts back to its original position, closing the circuit and allowing the current to flow again.

Unlike other types of fuses, the MF-SM050-2 does not require manual resetting and can be used for multiple overcurrent events. This makes it ideal for applications where manual resetting would be impractical, such as motor protection circuits.

Conclusion

The MF-SM050-2 is a self-resetting fuse that is designed to provide overcurrent protection and automatic resetting for motors, pumps, transformers, and other applications. Its melting point is high, and its short-time current capacity is up to 28 times of its rated current, making it ideal for reliable overcurrent protection of these devices. The fuse is also suitable for power failure and overcurrent control systems of power supplies and batteries due to its high current-temperature performance and low profile.

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