After the thyristor is damaged, if there is no thyristor of the same type to be replaced, it can be replaced by another type of thyristor with similar performance parameters.
When designing the application circuit, a large margin is generally reserved. When replacing a thyristor, just pay attention to its rated peak voltage (repetitive peak voltage), rated current (on-state average current), gate trigger voltage, and gate trigger current, especially the rated peak voltage and rated current.
The replacement thyristor should be consistent with the switching speed of the damaged thyristor. For example, after the high-speed thyristor used in the pulse circuit and the high-speed inverter circuit is damaged, only the same type of fast thyristor can be used instead of the ordinary thyristor.
When choosing a replacement thyristor, no matter what the parameters are, there is no need to leave an excessive margin, and it should be as close as possible to the parameters of the replaced thyristor because the excessive margin is not only a waste but also sometimes has side effects. , there are phenomena such as no triggering or insensitive triggering.
In addition, it should be noted that the shape of the two thyristors should be the same, otherwise it will bring disadvantages to the installation work.
Learn more about thyristor.
https://www.easybom.com/blog/a/the-best-electronics-tutorial-for-thyristor