Voltage/Current rating of Relay for Inductive load
If you NEVER do live switching, you should not have any problems. The contact rating for different loads is presented only as a factor determining contact life as a number of switching operations. I would as interpret that as live switching operations.
Inductive load is an issue with live switching.  At some level of voltage, current and power factor or L/R, there is a potential for failure to interrupt the current the first time live switching is attempted.
The linked data sheet gives no data for inductive loads except to the extent that, for contact life determination, some unknown level of inductance is assumed in the electronic ballast load. The life for a capacitive load is determined per a cited standard.
The title of the specification page says that the product is suitable for motor load, but that is not at all supported by the specification details.
Note that the UL recognized component ratings support 40A at 347 VAC resistive. Operation above 250 V is not supported by VDE. That should discourage operation 40A, 400V inductive circuit operation except for that fact that the use is stated as &quot;no live switching.&quot;
Re Comments
Your comment &quot;Please see the LLC converter diagram&quot; raised the question &quot;what diagram?&quot; I did not see a diagram so I discovered that you had asked previous questions about this. After reviewing those, it seems to me that you are just trying to select the number of series inductors in the circuit for various tests. It seems to me that you should just wire them all in series providing connection points for a shorting conductor that could be connected as shown below. I would be inclined to connect the inductors by bolting ring lugs together or bolting ring lugs to the inductor terminals if the inductors have bolt connections. The bolts could be mounted on some kind of rigid insulating material. You would connect the shorting conductor at any point just by bolting it together with the other two. Alternatively, you could attach sockets for some kind of pun connector at each connection point.

Example:
The example shown below shows the bolted connection that I described above. The wire and the two lugs attached to wire are rated about 80 amps. When using two nuts as shown, a brass nut would be better between the top lug and the two lugs below. The red material is fiberglass channel. It is a good strong insulating material that can withstand a temperature significantly higher than would be expected with the wire carrying rated current. It can be drilled reasonably easily, but I didn't want to drill it for this photo. This is stuff I have in my workshop.