MF-SM013/250-2

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

PTC Resettable Fuses are one of the main solutions used in the protection of electrical circuits. They allow multiple interruptions after each of which it is possible to interrupt the circuit again without the intervention of any external device. The MF-SM013/250-2 is a representative of such solutions; it is used as an overcurrent element, allowing automatic protection of various loads. The article will focus on the characteristic features of the device, its principles of operation and scope of application.

The MF-SM013/250-2 is a self-resetting PTC fuse based on a positive temperature coefficient. It contains a polymer material with properties that can be adjusted by adding chemically active agents. The connection of such polymers with active elements allows the device to switch from high to low resistance with changes in ambient temperature. In the event of an overload, increased resistance causes an increase in temperature, which in turn leads to the destruction of the contact.

The overload relay in the device functions due to the temperature rise of the conducting elements. Once the current exceeds the permissible limit, local heating of the composite material increases its resistance and a noticeable heating of the element occurs. As a result, the thermal protection element “burns out” and opens the circuit, which can be reset after cooling. The mechanism allows for short-term interruptions with a residual current. Also, when the current drops to the normal level, the fuse element automatically resumes its working position.

The device is characterized by several features, including a nominal current of 250A, voltage rating of 600V AC, interrupt capacity of 17 kA. It is necessary to note that the design of the fuse includes a surge suppressor, which prevents the destruction of the element in an instantaneous short circuit.

The device is successfully applied as an emergency protective device for express delivery systems, public transport and other transport systems, power equipment with various loads, as well as for the protection of powering systems with direct voltage up to 600V. When applying the MF-SM013/250-2, the main attention must be paid to selection of a correct nominal current. It should exceed the operating current of the protected circuit, since with a decrease of the current the chances of switching off the device increase.

In conclusion, it is necessary to acknowledge the efficiency of the MF-SM013/250-2, as it provides quick connection and disconnection of an electrical equipment with the possibility of repeated fuse restarts. This makes the device attractive for use in areas with highly reliable electrical protection.

The specific data is subject to PDF, and the above content is for reference