SL12-22101-AT

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Introduction

Inrush Current Limiters (ICL) are devices that protect electrical components from an over-current event due to an excessively high instantaneous current called an inrush current. The SL12-22101-AT Inrush Current Limiter is a specialized component for limiting inrush currents in multiple applications. In this article, we will discuss the application field of the SL12-22101-AT and the working principle behind it.

Application field

The SL12-22101-AT ICL is an Automotive Grade II device designed for automotive applications. It is primarily used for lighting control and device protection such as dimmers, LED lighting, automobiles, and other devices. The automotive application requires an inrush current limiting device to prevent instantaneous peak current or an over-current event on the power line. The SL12-22101-AT ICL is certified to strict automotive standards and has features that make it an ideal choice for an inrush current limiting device in automotive applications.

Working principle

The SL12-22101-AT Inrush Current Limiter works on the principle of using a thermally-triggered, resettable over-current protection device that contains two distinct resistive heating elements. The device works by using a low current setting to limit the magnitude of the instantaneous peak current, and a high current setting to limit the duration of the current through the device.

When a high current is applied to the device, the first element produces heat due to the resistance. This heat causes the second element to expand, reducing the resistance and allowing more current to flow. The second element eventually shrinks back to its original size, restoring the high current setting and limiting the duration of the peak current.

The combined effect of the two resistive elements creates a current limit with a wide operating range. This allows the device to limit the magnitude of the peak current, thereby preventing damage to sensitive electrical components, while still allowing normal operation of the circuit.

Conclusion

The SL12-22101-AT Inrush Current Limiter is a specialized component for limiting inrush currents in multiple applications. It is an ideal choice for an inrush current limiting device in automotive applications due to its certification to strict automotive standards and feature set. It works by using two distinct resistive heating elements, creating a current limit with a wide operating range and protecting sensitive components from damage due to an over-current event.

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