MF-LR730/20-0

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PTC resettable fuses are valuable components in the circuit design and many electronic device manufacturing. Among them, MF-LR730/20-0 is one of the most popular resettable fuses used in the industry. It has a wide range of application fields, which are mainly used in protecting the appliance circuit from short circuit or overload current. This article will introduce the application field and working principle of MF-LR730/20-0.

MF-LR730/20-0 is an SMD type PTC resettable fuse, its rated current is 20A and the rated voltage is 63VAC/180VDC. It can be suitable for many kinds of usage scenarios. Its wide operating temperature range (-55°C~150°C) makes it suitable for application in hot or cold environments, like in outdoor usage, transit, HVAC. It is also UL certified, adding another layer of safety. Moreover, the device also has a wide array of applications in industrial, consumer, automotive and medical fields.

MF-LR730/20-0’s working principle is based on its thermally-sensitive PTC design. The device uses two terminals— positively and negatively charged— as the current path. Since the device is PTC, it has predetermined resistance when current flows through it. But as the device gets hot due to overload current or short circuit, it increases its resistance so that further increase in temperature is prevented. If the current is still flowing, the device will continue to generate heat until it reaches its rated reset temperature, and then the resistance will decrease and the subsequent current flow will be limited to the rated current of the device.

When the overload condition or short circuit disappears, the device will cool down gradually, and eventually return to its original state (open circuit) to reset itself. This makes it beneficial for protecting the safety of the electric appliance circuits, which allows users to easily replace the device when it is triggered. Therefore, the MF-LR730/20-0 is a reliable and cost effective solution for overcurrent protection for various types of electrical circuits.

In summary, MF-LR730/20-0 is one of the most popular resettable fuses used in the industry. It has a wide range of application fields and its UL certification makes it safe for use in many usage scenarios. Moreover, it’s thermally-sensitive PTC design allows it to sense and protect against overcurrent and short circuit scenarios, providing an effective solution for protecting electric appliance circuits.

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