SG200 Circuit Protection

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Inrush Current Limiters (ICL) are a type of protection device used to avert excess current with an instantaneous value above that expected in normal start-up or operation, a phenomenon known as inrush. This type of current can overload circuit breakers, damage mechanical switches, or cause power problems. An effective way to prevent inrush current is the use of an Inrush Current Limiter (ICL). This article will discuss application fields and working principles of SG200 ICLs.

The SG200 ICL is a silicon controlled rectifier-based active device designed to limit the current at power up, during operation or at failure. The device is able to reduce the demand on power supplies and networks, limit the stress on active junction elements, and protect against overvoltage. Furthermore, the SG200 provides a frequency-independent V-I characteristic, enabling current limitation independent of the power line frequency. This makes it an ideal device for protecting a range of electronics from inrush currents.

The SG200 ICL is an efficient protection device for audio and video equipment, motor and transformers, power distribution systems, industrial applications, and telecommunication applications. It has a wide range of application fields in these areas, and in addition to limiting inrush current, it can also provide surge protection, power management, fault protection, and power level monitoring.

The working principle of the SG200 ICL involves the use of a negative temperature coefficient (NTC) resistor. This resistor is placed in series with the primary junction of the ICL, and it acts as a thermal switch. When the temperature rises beyond a certain threshold, the resistance of the NTC resistor increases dramatically, producing an associated drop in current. This results in a highly efficient limitation of the inrush current.

In addition to the NTC resistor, the SG200 ICL contains other thermal components, such as temperature sensing diodes and thermal switches, to control the power being supplied to the load. Once the inrush current is stabilized, a control circuit is activated to allow the supply of power to the load and to maintain a stable voltage across it. The thermal element is re-energized, and the control circuit is reset when the temperature drops.

The SG200 Inrush Current Limiter has a wide range of application fields and is a highly reliable and cost-effective solution for protecting against inrush currents. Its frequency-independent characteristic makes it ideal for a variety of electronic applications, and its effective working principle makes it a valuable protection device.

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