MF-R250-2 Circuit Protection

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PTC (positive temperature coefficient) resettable fuses are gaining increasing popularity among electronic circuit designers due to their ability to reset themselves after they trip. They are also known as "polyfuses" because they contain thermal plastic polymers that are designed to melt in extreme temperatures.MF-R250-2 is one of the most popular resettable fuses on the market today, and it has a wide range of applications. This article will discuss the application field of MF-R250-2 as well as its working principle.

The primary applications of MF-R250-2 resettable fuses include overvoltage protection, overcurrent protection, and short-circuit protection. This PTC resettable fuse is ideal for protecting sensitive electronics from voltage and current spikes. It can also be used to replace conventional fuses with better protection. As a resettable fuse, it can be reset after a fault event, thus eliminating the need to replace the fuse element. MF-R250-2 can also be used for AC/DC protection, motor drive protection, and battery charging protection.

MF-R250-2 works according to the basic principles of PTC thermistors (positive temperature coefficient thermistors). When the current flowing through the fuse exceeds its rated value, the temperature of the thermal plastic polymer inside the fuse will rise rapidly. When the temperature rises above a certain threshold, the plastic polymer melts, breaking the connection between the internal terminals. This thermal cut-off (sometimes called a thermal trip) will immediately stop the flow of current, thus protecting the connected electronic devices and components from damage. Once the fault is eliminated, the fuse can be manually reset by disconnecting and then reconnecting the power source.

The working principle of the MF-R250-2 can be further explained by its thermal detection and cut-off characteristics. The thermal detection characteristic refers to the temperature limit at which the plastic polymer inside the fuse will melt and trip the fuse. The cut-off characteristic refers to the amount of current that can be carried by the fuse before it trips. The MF-R250-2 fuse is certified to handle up to 10 A continuous current and up to 150 A peak current before tripping. The thermal detection temperature of this fuse is usually set to about 160 degrees Celsius.

MF-R250-2 is a reliable and highly effective PTC resettable fuse. It is designed to protect sensitive electronic components and circuits from overvoltage, overcurrent, and short-circuit failures. It is also capable of being reset after a fault event, thus eliminating the need to replace the fuse element. The working principle of this resettable fuse is based on the thermal detection and cut-off characteristics of PTC thermistors, and it is certified to carry up to 10 A continuous current and 150 A peak current before tripping.

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