Whether adding these Line choke will “protect” our ATV630 with 100kA system.

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There is no need of the line choke for use the ATV630 with 100kA system. The drive has been design for work in the UL condition; The UL require the possibly to mount the product inside cubicle which allow to connect the system at 100kA Isc. Due to the DC choke embedded, the impedance is added on the line and it enough to limit the current on the 100kA system.