CMF-RL35-10-0

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Introduction
The CMF-RL35-10-0 is a fully resettable fuse designed for overcurrent protection in a wide variety of applications. It is a polymeric positive temperature coefficient (PPTC) resettable fuse that responds swiftly to an overcurrent event, actuating to an open state quickly to protect the load from potential damage due to an overcurrent situation. It then resets once the conditions that led to the overcurrent occurrence have settled, and is ready for immediate use, providing the user with the advantage of rapid recovery after an overcurrent event, and allowing continuous operation of the protected system.

Types of PTC Resettable Fuses
PTC resettable fuses come in two main types, the ferroresonant type and the polymeric type. The ferroresonant type is the oldest and most common, while the polymeric type is the preferred choice for more recent applications. The ferroresonant type is made from ferrite, and works by using a special type of ferrite material that provides a resistance/temperature coefficient. This material will heat up when exposed to a current above its rated maximum, causing the resistance to increase rapidly, until a predetermined overcurrent level is reached, at which point it will open and break the circuit. The polymeric type is made from a proprietary polymer material, and actuates in a similar fashion, by increasing its resistance when exposed to an overcurrent event so as to open the circuit.

CMF-RL35-10-0 Application Field and Working Principle
The CMF-RL35-10-0 is a polymeric PTC resettable fuse, and is designed for a wide variety of applications, including overcurrent and surge protection, as well as protection from reverse polarity and short circuits. It has a hold current range from 0.15A to 10.0A, and a trip time of less than 20ms at 200% of rated current.

It works by using the PPTC polymer material to provide a resistance/temperature coefficient. When the fuse is activated, the PPTC material will heat up due to the increased current flow, causing the resistance to increase rapidly. This will cause the temperature to rise, eventually reaching a predetermined trip point, at which point the fuse will open and break the circuit. Once the circuit is open, the PPTC material will cool, and the resistance will drop again, allowing the fuse to reset itself and be ready for use again.

Advantages and Disadvantages of CMF-RL35-10-0
The advantages of the CMF-RL35-10-0 are that it is very fast to actuate and reset, providing overcurrent protection in less than 20ms at 200% of rated current. It is also very reliable, with a temperature range from -40 C to 85 C, and a maximum surge current rating of 45A, making it suitable for a wide variety of applications. Additionally, since it is a resettable fuse, it provides the user with the advantage of rapid recovery after an overcurrent event, and allows continuous operation of the protected system.

However, the fuse can also be relatively expensive compared to other types of overcurrent protection devices such as circuit breakers, and it can be prone to wearing out over time due to repeated overcurrent events. Additionally, the PPTC material used in the fuse is not suitable for applications that require higher power levels, and may be prone to false trips under certain conditions.

Conclusion
The CMF-RL35-10-0 is a polymeric PTC resettable fuse designed for overcurrent and surge protection. It has a fast actuating and resetting time, a wide temperature range, and a maximum surge current rating of 45A, making it suitable for a variety of applications. However, it can be relatively expensive compared to other overcurrent protection devices, and it may be prone to wearing out over time or false trips under certain conditions.

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