Far more likely that the drive board has failed, causing the the fuse to blow and tripping the MCBs (might even cause a leak to earth, which would trip RCDs as well)

Depending on the X3 supplier (X3 is a fairly generic design, with a few different manufacturers, and each manufacturer offering customisation options for each buyer, so the actual spec varies quite a bit between suppliers), the spindle drive boards can be quite temperamental, and often release their magic smoke randomly.