why is not so easy to make sure the quality with Russian type fast Thyristor?
Russian type fast Thyristor(capsule version) such as TB143-500 TB553-800 Etc  is a kind of fast Thyristor which widely used in big power transformer ,AC/DC motor control  , inverter ,welder etc , for this kind of thyristor , the  higher Vrrm (repetitive peak reverse voltage) , the longer turn off time will requirements 

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