CMF-SM10-2

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A PTC resettable fuse, such as the CMF-SM10-2, is a type of electrical device designed to protect a circuit from overcurrent and overvoltage conditions. This application-specific product is available from Pacific Resistor Co. and features a 10 amp long-term current rating, as well as a 28 volt hold current rating. The fuse also has a short-term rating of 16 amps and a 10 amp interrupt rating. This product is typically used in electric motors, lighting systems, food services equipment, and medical and telecommunications equipment, as well as other applications. The following article provides an overview of the application field and working principle of the CMF-SM10-2.

The CMF-SM10-2 PTC resettable fuse is composed of two parts. The first is a polymeric Positive Temperature Coefficient (PTC) material, which acts as an electrical resistor when heated. The second part is a fuse element made of a high melting-point alloy. Heat from the electrical current melts the fuse element, which in turn opens the circuit and then limits the current.

In normal operation, current flows from the power source through the PTC material, to the fuse element and then to the load. When the circuit is overloaded and the current exceeds the fuses rated limit an electric arc is generated between the fuse element and the PTC material, and heat is generated throughout the fuse. As the heat exceeds the PTC materials activation temperature, the PTC material resistance increases dramatically. This rapid increase in resistance limits the current to levels below the fuses rated limit, opening the circuit and protecting it from further damage.

Once the circuit has opened, the current is cut off from the heat source, which in turn reduces the temperature of the fuse and the PTC material. As the temperature cools, the PTC material gradually returns to its normal resistance, and the fuse element cools to its original level. When this happens, the circuit is reset and the fuse element is ready to be used again.

The CMF-SM10-2 PTC resettable fuse offers a number of benefits to electrical systems. It helps protect the system from overvoltage and overcurrent conditions, it helps prevent costly repairs due to circuit overloads, and it is easy to reset and re-use after the circuit has been tripped. Additionally, the PTC material in the fuse reduces power losses, and the fuse element is designed to prevent arcing and sparking. All of these factors make the CMF-SM10-2 an ideal choice for applications where multiple reset cycles are needed, such as electric motors, lighting systems, and medical and telecommunications equipment.

In conclusion, the CMF-SM10-2 PTC resettable fuse is an application-specific product designed to protect circuits from overvoltage and overcurrent conditions. The fuse is composed of two parts: a polymeric PTC material and a high melting-point alloy fuse element. In normal operation, current flows from the power source through the PTC material and then to the fuse element and load. If the current exceeds the rate limit, heat is generated throughout the fuse, increasing the PTC material resistance. This ultimately opens the circuit and prevents further damage. The reset feature of the fuse allows it to be easily restored after circuit tripping. The CMF-SM10-2 fuse is suitable for use in electric motors, lighting systems, food services equipment, and medical and telecommunications equipment.

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