SG320

Series:	SURGE-GARD™
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
R @ 25°C:	16 Ohms
Tolerance:	±25%
Current - Steady State Max:	4A
R @ Current:	250 mOhms
Diameter:	0.750" (19.05mm)
Lead Spacing:	0.350" (8.89mm)
Approvals:	CSA, UR

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Inrush Current Limiters (ICL)

Inrush current limiters are an important component in many electrical systems, including in applications such as automotive systems, data centers, power grids, and industrial systems. The primary purpose of inrush current limiters is to limit the sudden surge of current when switching or powering up circuits. Their ability to limit this current is especially important in power supply circuits where an excessive initial current can cause destruction of components or other parts of the system.One of the most popular inrush current limiters on the market today is the SG320. Manufactured by Mersen Corporation, the SG320 is a compact, low-profile, three-phase inrush current limiter designed for high-power applications. The device features a robust mounting bracket that is capable of handling harsh environments. The SG320 boasts current limiting capabilities up to 24 kA with response times of just 8 µs on some devices.The SG320 is designed to limit the inrush current during the start-up of non-linear loads such as power supplies, air compressors, electric motors, fan drives, and some types of transformers. The device is often used in large power systems where the inrush current of the load can cause disruptions in the power grid, potentially resulting in catastrophic damage. The working principle of the SG320 is based on a combination of magnetic field saturation and power dissipation. When the device is energized, it is subject to a sinusoidal current waveform. This current waveform saturates the magnetic core, creating a magnetic field. This field then acts as an inductor which stores energy and limits the inrush current.The device is also designed to reduce the amount of heat generated by the inrush current. The SG320 features Mersen’s patented ‘passive’ cooling technology, which is able to dissipate heat without the use of any active components. This ensures the device remains cool and operates efficiently at all times. In summary, the SG320 is a popular inrush current limiter that is capable of safely limiting the surge current when switching or powering up circuits. Its combination of magnetic field saturation and power dissipation allows it to dramatically reduce the potential damage from initial current surges. As a result, the SG320 is an ideal product for high-power applications in industrial, data center, automotive, and power grid systems.

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