SG150 Circuit Protection

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Inrush Current Limiters (ICLs) have become increasingly popular in recent years, and the SG150 range of inrush current limiters is among the most sought-after. This range of inrush current limiters offers reliable and effective circuit protection, safeguarding the components in a system against damaging levels of peak current surges. This article will discuss the application field and working principle of the SG150 inrush current limiter.

The SG150 range of inrush current limiters is typically used in power supplies, motor circuits, power amplifiers, power sockets, and computer systems, among other applications. They are designed to provide reliable circuit protection from current surges that occur immediately when power is switched on, and again when when circuits are triggered. This protection is provided by limiting the inrush current to a safe level that is low enough for the components in a system to avoid damage.

The working principle of the SG150 inrush current limiter is based on the use of an NTC thermistor. NTC stands for "negative temperature coefficient", meaning that resistance decreases when temperature increases. These electrical components are used because of their ability to create resistance with an electrical current. The SG150 inrush current limiters rely on the NTC thermistor to significantly reduce a sudden surge in current, limiting it to a safe level.

When the power source is switched on, an inrush current flows through the thermistor. This current flows between the switch and the components in the circuit, causing the temperature of the thermistor to rise. As the temperature rises, the resistance of the thermistor also increases, and this restricts the flow of current, limiting it to a safe level. As the temperature of the thermistor returns to normal, the resistance decreases, allowing the current flow to increase again.

The SG150 inrush current limiter also contains a thermal disconnection feature that further enhances the safety of a circuit. This feature prevents damage to components by ensuring that resistance remains high even after the temperature of the thermistor has decreased. This prevents surges in current and helps to ensure that the components are shielded from damage.

The SG150 range of inrush current limiters is designed to provide reliable and effective circuit protection. By limiting inrush current to a safe level and providing a thermal disconnection feature, it protects circuits against damage and increases the lifespan of components. It is suitable for a wide range of power supply applications, and the thermistor-based working principle ensures reliability and efficiency in operation.

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