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Do the Altivar 58 drives have TVSS or MOVs for surge suppression across the internal relay contacts?

No. They are dry contacts. They can be used on a wide range of voltage types. Therefore, there are no internal provisions for Transient Voltage Surge suppression. It is good to have TVSS for relay coils that will be operated by means of the drive relays.
This also applies to relay contacts on the option cards.

CTA-ID : 6784
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