SG301

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Inrush Current Limiters (ICLs) are devices used in power system applications for protecting circuit breakers, electric motors, and other components from potentially damaging transient inrush currents. The SG301 series from Littelfuse is an ICL specifically designed for controlling inrush current in high-power industrial and consumer applications. This article will discuss the application field and working principle of the SG301.

The SG301 series is a high-power Inrush Current Limiter (ICL) designed to provide effective control of inrush current in applications such as power supplies, transformers, UPS systems, automotive electronics, and other equipment. It is designed to protect components from potentially damaging transient inrush currents by limiting the current at power-up or switch-on and enabling safe system start-up without the need for additional circuitry. The SG301 series features low static power consumption and a sub-1µs reaction time to ensure fast response to transient inrush current. Its pass-through design also offers the advantage of low voltage drop and minimal power loss.

The working principle of the SG301 series is based on thermally activated Inrush Current Limiters (ICLs). The series is equipped with a device that contains a positive temperature coefficient (PTC) element. When power is applied, the PTC element heats, slowly reducing its resistance. The parallel circuit with the PTC element and resistor determine the maximum current that can flow through the module in terms of inrush current limit. As the PTC element heats, the current limit reduces gradually and the device becomes a low impedance. When the PTC element reaches its maximum temperature, the inrush current limit is fully recovered and the device can resume its nominal operation.

In summary, the SG301 series Inrush Current Limiters are designed for high-power industrial and consumer applications to provide effective control of inrush currents and protect components from potentially damaging transient current surges. The series features a pass-through design that offers the advantage of low voltage drop and minimal power loss. Its thermally activated PTC element is designed to provide a sub-1µs response time to enable fast start-up without the need for additional circuitry. With its high-performance specs and features, it is a great choice for applications requiring reliable inrush current protection.

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