Can the PXB20K-500 output 525 V when the input voltage is 240 Vac?

No. The input voltage rating 200 Vac model has a nominal input voltage range of 200 Vac to 240 Vac.

Even when the input voltage is 240 Vac, the rated output voltage of the PXB20K-500 is 500 V.

Although the maximum settable voltage is 525 V, an output voltage of 525 V is not guaranteed.

For details, refer to "Output Specifications" in the User's Manual.