T405-400T

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Triacs are three-terminal, bidirectional semiconductors that act similarly to switches when triggered by voltage in either direction. One such example is the Thyristor T405-400T, which is used in the high voltage switching, lighting and heating industries. This article will explain the application fields of the T405-400T, as well as its working principle.

Overview of the T405-400T

The T405-400T is a triac which is specifically designed for use in medium-power, bidirectional applications. The triac has two ‘arms’: the MT1 terminal and the MT2 terminal, which are connected to a Gate, the point at which external controlled voltage is applied. In addition, the T405-400T contains a fuseable thermal link, which is a safety device which is triggered by excessive current to disconnect and protect the unit from overloading.

Application Fields of the T405-400T

The T405-400T is suitable for use in a variety of applications which require bidirectional switching or on/off switching of medium power applications. Some of the applications which take advantage of the T405-400T thyristors’ switching capabilities include variable speed drives and light dimmers for energy saving, motor phase control for electric vehicles, and furniture/appliance on/off switching. The device is rated at up to 400 V and up to 25 A. In addition, because of its small size, it can also be used in computers, communication systems and various automation systems.

Operation of the T405-400T

The principle of operation of the Triac T405-400T is based upon the ability of the semiconductor material to switch on at certain applied voltages and currents. The device is triggered by a voltage applied to its Gate terminal: when the voltage reaches a certain level, current is allowed to flow through the device. Once triggered, the Triac will remain conductive until the current through it is interrupted. In this manner, the T405-400T can be used to switch or control electrical currents over a range of voltages from 25V to 400V, and currents from 0.5A to 25A.

Conclusion

The T405-400T is a thyristor which is specifically designed for bidirectional and on/off applications. It is suitable for use in medium-power applications such as light dimmers, motor control, and appliances/furniture on/off switching, and has a range of up to 400V/25A. The operation of the triac is based on its sensitivity to external voltage, which is applied to its Gate terminal, and the device remains conductive until the current through it is interrupted. The T405-400T is a useful and versatile device appropriate for a variety of medium-power applications.

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