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EPACK Thyristor

Dear Sir,
We have a 3phase EPACK thyristor with 32AMP rating. We are facing fuse blown issue continuosly.
We have checked heaters. Found ok. After replacing the fulty fuse the thyristor working normally.
Actually we used Schneider make microprocessor based MPCB and Bussmann semiconductor fuses in the series with mains supply of thyristor. One are two fuses are blown automatically after some period of time.
My question is:
Shall we skip the fuses and can use the microprocessor based MPCB only at the thyristor incomming side?? Is it right way?? Or how can we troubleshoot the fuse blown issues.
Please dp needful
Please find attached pictures for reference.

Regards,
Dipak Patil

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