Switzerland - IEC vs UL vs VDE vs CSA ratings
It is not.

The working voltage rating is 300V due to the pins being only 5 mm apart on the pcb. That gives you only 2 mm of distance between copper.    

The 7.5/7.62mm pitch variant should be fine, or you can skip a pin between 400V terminals.   However, that will add two more pins in width.