A possible cross for thyristor MTC500-16 would be VS-VSKT500-16PBF-ND. Please review datasheet specifications before ordering to ensure it will work for your specific application as there may be some differences.
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Original MTC500-16
Source - https://www.tme.com/Document/6b951f92d25ed73d6f3727864f7a3b8f/MTx500.pdf
Suggested Replacement VS-VSKT500-16PBF-ND
Two SCRs Doubler Circuit
