CMF-SDV09-2

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PTC resettable fuses, such as the CMF-SDV09-2, are a type of thermal fuse that are widely used in a variety of applications. When the current in the circuit exceeds the rated value of the fuse, it melts, forming an open circuit and preventing further current flow. This helps protect the circuit from over-current damage. The PTC fuse can then be manually reset by switching off the power for a few seconds. After resetting the fuse, normal current flow is restored.

The CMF-SDV09-2 is a small PTC resettable fuse with a very low temperature coefficient of resistance (TCR) that enables it to maintain very precise current values over varying temperature ranges. It has a current rating of 14 A, a rated voltage of 350 V AC/DC, and a working temperature range of -40° C to 105° C. The CMF-SDV09-2 has a small package size, measuring just 10x4x4 mm, making it ideal for use in small electronic devices.

The working principle of the CMF-SDV09-2 is based on its complete temperature-sensing element, which consists of an alloy wire with a small piece of ceramic. When the current in the circuit exceeds the rated value of the fuse, the alloy wire heats up due to the resistance generated by the ceramic piece, melting it and forming an open circuit. This breaks the connection in the circuit and prevents further current flow. After the circuit is reset by switching off the power for a few seconds, the melted alloy wire re-solidifies, restoring the original connection and allowing normal current flow to resume.

Due to its small size and precise current regulation, the CMF-SDV09-2 is an ideal choice for a variety of applications. It has been used in automotive and marine electrical systems, computers and computer peripherals, medical equipment, industrial control systems, security systems, lighting systems, and a wide range of other applications. It is also widely used to provide over-current protection for circuit breakers and other sensitive electrical components.

In conclusion, the CMF-SDV09-2 is a small, low-temperature PTC resettable fuse that can be used in a variety of applications that require precise current regulation and over-current protection. Its working principle is based on the complete temperature-sensing element, which consists of an alloy wire and a small ceramic piece. When the current in the circuit exceeds the rated value of the fuse, the alloy wire melts, forming an open circuit and preventing further current flow, while resetting the fuse after a few seconds restores normal current flow.

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