SG405

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Inrush current limiters (ICL) are widespread in modern electrical engineering and come in many different forms. One of the most common ICLs used in today’s field is the SG405. It is used for protection against surges due to line-based power supplies, and also serves to prevent system faults.

The SG405 has a simple and compact form factor. It can be easily mounted in areas with limited space. It has a wide working voltage range from 9V to 72V and can handle inrush currents up to 40A. The device also has low leakage current and low power consumption.

The SG405 works by limiting the rise in voltage and current to a predetermined level on power-up. The device consists of three main components – an inductor, a resistor and an FET. When the power is switched on, a surge of current passes through the inductor and resistor before flowing through the FET. During this time, the FET acts as a switch and controls the rate of the current flow.

When the power-up surge reaches a certain voltage, the FET begins to turn off and limit the current. This is due to the characteristic of the FET which decreases as the voltage increases. As the voltage across the FET decreases, its resistance increases and this slows down the current flow.

The SG405 can also be used to protect against reverse-current surges. This is done by adding a diode in parallel with the FET to prevent the current from flowing through the FET in the wrong direction.

The SG405 is a reliable and cost-effective ICL and is used in numerous applications in the field of electrical engineering. It is commonly used in power supplies, car audio systems, home appliances and other electronics devices. The device can prevent system faults and provides a much more reliable and cost-effective solution compared to other ICLs.

In conclusion, the SG405 is a popular ICL that is widely used in the field of electrical engineering. It is a reliable and cost-effective solution for inrush current protection and can be used in many different types of applications. The device has a simple and compact form factor, and is easy to install in areas with limited space. It also provides protection against reverse current surges by using a diode in parallel with the FET. The device is an invaluable addition to any electrical system and can prevent costly system faults.

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