ST7R004B

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Inrush current limiters (ICL) are used to protect electronic devices from inrush currents and peak voltages. These current limiters are designed to protect load circuits which are sensitive to current overloads or over-voltage conditions. The ST7R004B is a type of ICL which is widely used for this purpose.

The ST7R004B is designed to let through a pre-set amount of current and then quickly reduces the input voltage, providing an effective protection against inrush currents. It has a high dielectric strength and a low break-over voltage. The device is also highly reliable and has a good response time, making it suitable for a wide variety of applications.

The working principle of the ST7R004B is based on its thermally-assisted mechanism. The device has two main components: a thermal element and a resistive element. When the voltage is applied to the device, the thermal element heats up and expands, causing the resistive element to move. This reduces the amount of current flowing through the device and limits the peak voltage. This way, the device is able to provide effective protection against peak voltages and inrush currents.

The ST7R004B is primarily used in automotive applications, particularly in the areas of voltage protections for permanent magnet motors, electric vehicle injection systems, and charging systems. It is also used in industrial applications, such as in the protection of electronic devices against inrush currents, and in the protection of telecom applications from over-voltage conditions.

The ST7R004B is a versatile and reliable device which provides effective protection against inrush currents and over-voltage conditions. It has a fast response time, a high dielectric strength, and a low break-over voltage, making it suitable for a wide variety of applications.

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