I didn't notice the 230V voltage applied to 25V SIOV problem suggested in the schematic.
- due the expectable fuse melting + arcing time, the SIOV energy rating is probably exceeded multiple times
- notice that TE5/SS5 breaking capacity may be also exceeded, even for the "best" devices like TE5 series 400
If feasible at all, larger SIOV and fuses with higher breaking capacity as well as fast arc extinguish capability (300 V DC rating) are needed. I feel that a massive parallel TVS circuit can be more robust, but I'm not sure about.