SG310

Series:	SURGE-GARD™
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
R @ 25°C:	5 Ohms
Tolerance:	±15%
Current - Steady State Max:	4A
R @ Current:	150 mOhms
Diameter:	0.60" (15.24mm)
Lead Spacing:	0.310" (7.87mm)
Approvals:	CSA, UR

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Inrush Current Limiters (ICL)SG310 is a popular Inrush Current Limiter (ICL) used widely in many industrial applications. It is mostly used in equipment that needs to be switched on and off frequently, particularly in lighting and uncontrolled motor applications. This article provides an overview of SG310\'s application field, and its working principle. Application Field The most common application for SG310 is in lighting systems, such as fluorescent lamps, discharge lamps, LED lamps, light motors, electric fans, and pumps. It is also used in applications where surges and current peaks are expected on start up, such as switching power supplies, refrigerators, incubators, and convection ovens. Its unique protection system guarantees protection against overloads and surge currents that occur when turning on electrical equipment, protecting both the equipment and the power supply from damage caused by these surges.The SG310 can also be employed in microprocessor-based equipment, which is sensitive to overvoltage or overcurrent. Its design can accommodate a wide range of voltages and currents, which allows it to be used in high-end industrial applications, such as in telecommunication systems, industrial automation systems, and medical equipment. Working Principle The working principle of the SG310 is based on a thermistors inrush current limiter. This type of limiter employs the principle of the negative temperature coefficient (NTC) to limit inrush currents. The SG310 is made up of two main components: an NTC thermistor and a bypass resistor. When the equipment is powered up, a large surge current flows through the thermistor due to its low resistance. This initial surge current causes the thermistor to heat up, and as it heats up, its resistance increases significantly. This increasing resistance reduces the current flowing through the thermistor and eventually causes the current to reach a steady-state value (the current value that should normally flow through the equipment). Once the steady-state value is reached, the thermistor is able to cool down and its resistance decreases. At this point, the bypass resistor takes over and allows the steady-state current to flow through the equipment, while the thermistor works to limit the initial surge current. The SG310 has an adjustable bypass resistor, which allows the user to limit the inrush current based on the specific application requirements. It also contains protection against voltage, temperature, and other overcurrents, which makes it a reliable and effective solution for inrush current limiting. In summary, the SG310 is a popular inrush current limiter used in many industrial applications. It works by using an NTC thermistor and a bypass resistor to limit inrush currents and protect both the equipment and the power supply from damage caused by surges. It has adjustable settings, allowing the user to tailor the current limiting to the specific requirements of the application. It also has protection against voltage, temperature, and other overcurrents, which ensures reliable performance and effective protection.

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