SPFE240A25R

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Solid State Relays

Solid state relays (SSRs) are widely used electronic components, and internally they consists of a semiconductor switching device, either thyristor (SCR) or TRIAC, and a couple of integrated circuit logic gate. The SPFE240A25R is a popular SPST type of SSR and its specific application field and working principle will be discussed in this article.

Application Field

The SPFE240A25R is a 25A high current SSR and is mainly used in wide range of industrial applications such as: high frequency power switching, motor switching, lamp control, DC voltage control etc. With its metal housing and high performance, SPFE240A25R is especially suitable for building automation and illumination purpose.

Working Principle

The SPFE240A25R has internal electronics that controls a heater element, a semiconductor power switch and an opto-isolator. The opto-isolator senses the low-voltage electric signal and transfers this to the internal electronics. The power switch is used to control the power to the load. When the voltage across the contacts is correlated with the voltage internally delivered to the internal electronics, triggering currents flow in the heater element, overcoming its resistance, thus releasing current to the power switch. Consequently, power is passed to the load.

The SPFE240A25R SSR offers very fast and reliable performance with no contact bounce or arcing. It is also known that the switching time of this relay is approximately 3ms, thus no contact wear and delay occur.

Conclusion

The SPFE240A25R is a robust SSR suitable for a wide range of high current applications. It has very fast switching time and doesn\'t suffer from contact bounce or arc. It is reliable and offers good performance in demanding applications.

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