ST5R005B

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Inrush Current Limiters (ICL) are electrical components used to protect a system from inrush currents. Inrush currents are large currents that occur when a circuit is initially energized. They can cause damage to electronic components and disrupt normal operation of a system. The ST5R005B is an example of an Inrush Current Limiter (ICL). In this article, we will discuss the application field and working principle of the ST5R005B ICL.

Application Field

The ST5R005B is a non-isolated aluminum-oxide varistor equipped with a thermistor component for over-current protection that provides a wide range of applications. In particular, it is designed to protect circuits from overvoltage and overcurrent conditions, including inrush current. The ST5R005B is suitable for use in high-end consumer and industrial equipment, such as air conditioners, refrigerators, washing machines, computers, UPSs, and other related electronic equipment.

Working Principle

The ST5R005B ICL works by limiting the amount of inrush current that flows when the circuit is initially energized. Inrush current is caused by large capacitive loads, such as power supply capacitors, which can cause an over-current condition. The ST5R005B ICL limits this inrush current and prevents it from damaging sensitive components in the circuit.

The ST5R005B ICL is composed of two components: an aluminum-oxide varistor and a thermistor. The varistor is a non-linear semiconductor that has a resistance that changes with the voltage applied to it. The thermistor is a temperature-sensitive resistor. Both components are connected in series across the power supply and act independently to limit the inrush current. When the inrush current flows, the varistor conducts it until the current reaches the predetermined over-current level, at which point the thermistor begins to conduct. The combined effect of the two components is to limit the amount of current that is allowed to flow through the circuit, thereby protecting it from over-current conditions.

The ST5R005B also features a built-in fuse that will open when the allowable inrush current is exceeded. The fuse will not reset until the circuit is powered off and then powered on again. This allows for quick and easy repair should the ICL become overloaded.

In conclusion, the ST5R005B Inrush Current Limiter is a reliable and cost-effective component used to protect circuits from over-current and over-voltage conditions, including inrush current. It is suitable for use in a wide range of consumer and industrial electronic equipment. Its construction and working principle make it an ideal choice for protecting delicate components from inrush current.

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