MICROSMD550LR-2

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PTC Resettable Fuses are increasingly becoming the popular choice for over-current protection of electronic circuits, especially for low-level circuits. One of the most commonly used devices is the MICROSMD550LR-2, which is used in many products ranging from cell phones to consumer or industrial electronics. This article explains the application field and working principle of the MICROSMD550LR-2.

A PTC resettable fuse generally comprises of a ceramic body, two electrodes, and a bi-material element, often called a trip element. When the current flowing through the PTC fuse exceeds the rated current level, the trip element melts and creates an open circuit, thus interrupting the current flow and protecting the device from overloading. As soon as the over-current condition ceases, the device will reset itself and can be used again until the load violates the rated current level.

The MICROSDM550LR-2 is an optimized device as it includes several protective features in its design. The device includes an automatic reset feature which guarantees maximum response time from an over-current situation. It has an overload protection of 265 % and a maximum DC voltage of 6V. The internal resistance of the device is 0.027 Ohm and it can be used repeated number of times.

The MICROSDM550LR-2 is suitable for use in consumer and industrial electronics such as uninterruptible power supplies, batteries, lighting systems, computers and telecom systems. It is designed to ensure the safety of circuits which may require high overload and surge currents.

When a current passes through the MICROSDM550LR-2, it automatically resets itself once the current drops below the minimum threshold. If the current exceeds the rated level for a prolonged period, the element will melt and open the circuit, cutting off the power supply. This feature helps to protect the circuitry from permanent damage due to an over-current situation.

In summary, the MICROSDM550LR-2 is a popular choice among PTC Resettable Fuses, due to the high levels of protection it offers and its range of applications. It can be used in a variety of consumer and industrial electronics, and its resetting mechanism helps to prevent long term damage to the circuitry. It is an efficient and cost effective solution for over-current protection.

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