ST30003B

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Inrush Current Limiters (ICL) are electronic components that are used to protect electrical and electronic systems from the overheating and destruction that can be caused by an inrush of current when a device is powered on. The ST30003B is one such ICL that is designed to provide protection from these destructive currents. In this article, we will discuss the application field and working principle of the ST30003B.

The ST30003B is an ICL with a nominal current rating of 3A. It is a single-in-line type device, and as such is suitable for mounting on printed circuit boards. It is typically used in applications such as computer power supplies, telecom systems, and general purpose power supplies.

The working principle of the ST30003B is based on the flow of current through a resistance. When the device is first powered on, the current will flow through the resistance, thus limiting the inrush current. After the time-delay period, the resistance is bypassed, allowing the maximum current to flow. This enables the device to protect the system from excessive current, while still allowing the maximum current to flow through.

The ST30003B also includes an integral fuse. This fuse serves as a final layer of protection, preventing any damaging currents from flowing through the device if it is subjected to too much current. The fuse can be replaced relatively easily, allowing the device to be reused in other applications.

The ST30003B has a number of features that make it suitable for a wide range of applications. It is RoHS compliant, and is also available in UL recognized and CSA certified versions, ensuring that it meets the safety requirements for many applications. In addition, the device has a wide operating temperature range (-40°C to +125°C), meaning it can be used in both indoor and outdoor environments.

Overall, the ST30003B is a robust and reliable Inrush Current Limiter. Its low cost, wide operating temperature range, and UL/CSA certification make it suitable for a variety of applications. It is a popular choice for use in computer power supplies, telecom systems, and general-purpose power supplies.

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