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Inrush Current Limiters (ICL)

Inrush current limiters (ICL) are devices used in electronic motors and circuits to limit the amount of current flow at power-up. The SL12 5R005-B is a specific type of inrush current limiter that offers exceptional performance in a minimal package size. This paper will examine the application field and working principle of the SL12 5R005-B in order to better understand the device and its usage.

Application Field of SL12 5R005-B

The SL12 5R005-B inrush current limiter is designed predominantly for use in electronic motors and circuits. It can also be found in power supplies, industrial equipment, surge protection devices, and automotive components such as alternators. In all cases, the goal of using an inrush current limiter is to prevent sudden and uncontrolled spikes in current at power-up, which can potentially damage sensitive components.

Working Principle of SL12 5R005-B

The SL12 5R005-B\'s working principle is based on the principle of thermal resistance. A zinc-oxide ceramic pellet is used as the device\'s thermal resistance element. This ceramic pellet provides a high resistance at low temperatures, but its resistance decreases as the temperature rises. A bimetallic-metal disc is used to sense the temperature of the thermal resistance element. As the thermal resistance element heats up, the metal disc deflects, increasing the contact area, and allowing current to conduct through the device. This allows the SL12 5R005-B to absorb the surge of current during power-up.In addition to the thermal resistance element and metal disc, the SL12 5R005-B also includes a permanent magnet. The permanent magnet\'s energy is used to compensate for the decrease in the thermal resistance element\'s resistance due to temperature. This ensures that the SL12 5R005-B will maintain its pre-set peak inrush current limit setting as temperatures change. This helps to ensure that the inrush current is maintained at safe levels regardless of environmental conditions.

Conclusion

The SL12 5R005-B inrush current limiter is a small but powerful device designed to protect sensitive components and systems from inrush current spikes caused by power-up. By using a combination of thermal resistance, bimetallic-metal sensing, and permanent magnet compensation, the SL12 5R005-B is able to provide reliable protection for a variety of applications. Understanding how the device works and its application field is key to ensuring that the best solution is selected for a given application.

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