MF72-012D20

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Inrush current limiters (ICLs) are protection devices used to limit inrush current, which is often encountered in a power circuit when a switch is turned on. MF72-012D20 series of ICLs are designed to protect the circuit in the event of a high current inrush and can be used for various applications in both power and automotive sectors. In this article, we will look at the application fields and working principle of the MF72-012D20.

Application Field
MF72-012D20 ICLs are suited for applications where reliable protection is needed against high inrush current, such as motor starting, transformer protection and other types of loads. They are used in power circuits where power is switched on or off rapidly and often. The ICLs are designed for both AC and DC circuits and can provide reliable protection over a wide temperature range.

In automotive applications, the ICLs are used to protect various circuits, such as those used for power steering, air conditioning and lighting. They can also be used for automotive start-stop systems where engine cranking is needed when the vehicle is started. Additionally, the ICLs can also be used in off-board charging systems, such as power banks, to protect against current overloads.

Working Principle
The MF72-012D20 ICLs are based on a thermally activated protection principle, where a mechanical bypass switch is triggered when a certain temperature is reached. The current limiting function is achieved via two main components, a resistor and and a bypass switch. When the current passing through the resistor reaches a certain level, it heats up the resistor and triggers the bypass switch. This will limit the current and help protect against potential overload or damage from an overcurrent.

The ICLs also have a built-in temperature-compensated function that can adjust the current limit automatically. This can be used to increase the current limiting capability as the temperature increases. Additionally, the ICLs also feature a fail-safe mechanism that will keep the circuit open if the ICL fails or is removed from the circuit. This will help protect the rest of the circuit from any damage due to an unexpected current increase.

In conclusion, MF72-012D20 ICLs provide reliable protection in power and automotive circuits when a current inrush occurs. They are designed to limit the current to a specified level and keep the circuit open if the ICL fails. This ensures that the rest of the circuit is not damaged as a result of an unexpected current increase.

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