CMF-RL55-0

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PTC resettable fuses play an important role in protecting electronic equipment from damage due to unexpected power surges. The CMF-RL55-0 is a Polymer Positive Temperature Coefficient (PPTC) resettable fuse designed for low cost, broad current range, and superior time-current characteristics. In this article, the application field and working principle of the CMF-RL55-0 will be discussed.

The CMF-RL55-0 is used in a wide range of applications including 5V and 12V DC power supplies, digital cameras, and other DC devices. It is designed to protect electronic devices from overcurrent, overvoltage, and short circuit. This resettable fuse is suitable for use in applications with limited board space, and the very low resistance ensures that the maximum voltage drop and power loss are minimized.

The working principle of the CMF-RL55-0 is based on a Polymer Positive Temperature Coefficient (PPTC), which is a material that undergoes a reversible transition from an insulating state to a conducting state when the temperature exceeds a certain threshold. The CMF-RL55-0 contains a PTC element which is placed in series with the load. When an overcurrent situation occurs, the temperature of the element will rise above the trip temperature, causing it to transition from a low resistance state to a high resistance state, thereby limiting the current. Once the trip temperature is reached, the resettable fuse will reset itself to its original condition when the current is reduced and the temperature returns to normal.

The CMF-RL55-0 is designed with a permanently shorted feature that is automatically activated when an overcurrent situation occurs. In this mode, the device is protected from destructive high-energy overcurrents. The device also features a double-warning indication of current overload that helps to prevent overloading of downstream equipment. This is done through a red LED, which lights up when the current reaches 1.2 times the rated current, and a green LED, which lights up when the current reaches 2.5 times the rated current.

The CMF-RL55-0 features a low trip temperature threshold, low power dissipation, and an excellent time-current characteristic. The device has a maximum voltage rating of 30V AC/DC and a maximum current rating of 55 amps. The CMF-RL55-0 also features a low temperature coefficient of resistance, allowing for improved thermal cycling characteristics. The device is designed to function reliably and offers superior protection for a wide variety of electronic devices.

In conclusion, the CMF-RL55-0 PTC resettable fuse offers superior protection for a wide range of applications. The device is reliable, features a low trip temperature threshold, low power dissipation, and an excellent time-current characteristic. It can be used in 5V and 12V DC power supplies, digital cameras, and other DC devices.

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