Switching 400V motor with 5V
You won't find a contactor capable of switching a 400V motor with a 5V coil.
12V is already rare. 

What you can do is cascade relays.
A small 5V pcb relay that operates a larger 24V contactor (with flyback diode).

Or use high side output driver from infineon for example.

Or use a digital method and control a frequency drive by modbus or signal relays.