I have a rotare phase converter here and after checking the error code and pulling out the control boardsone of the thyristors has gone short circuit and another only measures 4k resistance while the two others measure 1M.
The manufacturer just has message bank, and not got back to me yet ( I suspect it is only a small business so must be busy), so was wanting to just get two equivalent thyristors. Not sure if the originals are easily available. I found the spec sheet for the original, 90 amp 1800V models, it seems 1600V versions are more readily available.
Pictures of the thyristor numbers attached and a pdf of the thyristor spec sheet.
