3720W power supply load transient testing rig...is this the cheapest/quickest way?

Hi,
We wish to do Transient testing of our 3720W power supply.
No_load to Full_load to No_load…..

Please could you advise if there is a quicker/cheaper way to do this than the attached? We need the three load switchs to switch at the very same instant.

The power supply uses Vicor DCDC modules.

I think a simpler solution would be to use an optically coupled gate driver. That way you can go directly from your microcontroller to the LED of the opto.

Here is a sample that should work.

https://www.vishay.com/docs/84921/vod3120ab.pdf

You'll still need your independent, floating 12Volt supplies for the gate power.