SG140

Series:	SURGE-GARD™
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
R @ 25°C:	2.5 Ohms
Tolerance:	±15%
Current - Steady State Max:	9A
R @ Current:	40 mOhms
Approvals:	CSA, UR

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Inrush Current Limiters (ICL)

The SG140 is an inrush current limiter (ICL) that can be used to protect circuits, power supplies, and other devices from damage due to excessive inrush currents. The SG140 is designed to reduce inrush current to levels which are within safe limits.

Overview of Inrush Currents

Inrush current is the surge of electric current that occurs when a device is first powered on. It is usually caused by capacitors in the device which are initially discharged. When the device is first energized, these capacitors rapidly draw current to charge. This can create a dangerously high inrush current which can damage components, lead to circuit overloads, create sparks, or cause other problems.The SG140 is designed to limit the inrush current before it causes any damage to the circuit components. It works by creating a resistance in the circuit to limit the current when the device is first powered on.

How the SG140 Works

The SG140 works by using thermistors to limit inrush current. Thermistors are specialized resistors which have a property called “negative temperature coefficient” (NTC). This means that the resistance of these thermistors decreases as temperature increases.When the SG140 is first connected to a power supply, the thermistor creates a high resistance in the circuit. This resistance limits the current so that the inrush is safe. As the temperature of the thermistor increases, the resistance decreases, allowing more current to flow. This process continues until the inrush current has been reduced to a safe level.

Advantages of the SG140

The SG140 offers several advantages over other inrush current limiters. First, it is very efficient, and can handle very large surges of inrush current without damaging the circuit components. Secondly, the thermistor can react quickly to changes in temperature and power supply voltage, so it can limit the inrush current quickly and accurately. Finally, it is small and light, so it fits easily into tight spaces.

Conclusion

The SG140 is an efficient and effective inrush current limiter. It is small, light, and offers quick response time. It can protect circuits and components from damage caused by excessive inrush currents. The SG140 is a must-have for any electrical system that requires protection from inrush currents.

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